A master oscillator and a power amplifier of a master control oscillator

Abstract

The present application provides a power amplifier of a master oscillator and a master control oscillator, and relates to the field of power electronics technology. In the master oscillator, since the waveform of the seed laser signal emitted by the laser module is consistent with the waveform of the current signal of the laser module, the seed laser signal includes a laser pulse signal and a laser signal whose laser intensity before each laser pulse is constant and less than a certain value, so the laser signal whose laser intensity before the laser pulse is constant and less than a certain value enters the amplifier before the laser pulse; and since the laser signal whose laser intensity before the laser pulse is constant and less than a certain value can control the slow release of the inversion particle number in the gain medium in the amplifier, when the laser pulse enters the amplifier, the inversion particle number in the gain medium presents a Gaussian pulse shape release, thereby suppressing the leading edge overshoot and trailing edge tailing of the amplified laser signal, thereby improving the uneven distribution of the energy waveform of the amplified laser signal in the time domain.

Description

Technical Field

[0001] The invention relates to the technical field of power electronics, and in particular to a main oscillator and a power amplifier of a main control oscillator. Background Art

[0002] Typically, a laser module amplifies the power of a seed laser signal through a master oscillator power amplifier (MOPA); the amplified laser signal is called an amplified laser signal.

[0003] Since the seed laser signal is a laser pulse signal, the amplified laser signal is prone to leading edge overshoot and trailing edge tailing, that is, the energy waveform of the amplified laser signal is unevenly distributed in the time domain, which results in the amplified laser signal being unable to be efficiently amplified, that is, the laser power and energy of the amplified laser signal are not up to standard; and, leading edge overshoot will also cause excessive concentration of energy, which may cause damage to optical devices during the amplification process; in addition, the uneven distribution of the energy waveform in the time domain will also affect the quality of precision processing such as laser cutting, drilling, and scribing.

[0004] Therefore, how to improve the uneven distribution of the energy waveform of the amplified laser signal in the time domain is a technical problem that needs to be solved urgently. Summary of the invention

[0005] In view of this, the present invention provides a master oscillator and a power amplifier of a master control oscillator to improve the uneven distribution of the energy waveform of the amplified laser signal in the time domain.

[0006] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0007] On one hand, the present application provides a master oscillator, including: a laser module, a driving circuit and a controller; wherein:

[0008] The output end of the driving circuit is connected to the power supply end of the laser module, and the driving circuit is used to output a current signal to the laser module according to a preset period or continuously under the control of the controller;

[0009] The current signal includes a first current pulse signal and a constant current signal whose current value before each current pulse is less than a first preset value;

[0010] The output end of the laser module is connected to the input end of the amplifier, and the laser module is used to emit a seed laser signal whose waveform is consistent with the waveform of the current signal.

[0011] Optionally, the driving circuit comprises: two current output circuits; wherein:

[0012] The output ends of the two current output circuits are both connected to the power supply end of the laser module;

[0013] The first current output circuit is used for outputting a second current pulse signal having the same period and duty cycle as the first current pulse signal under the control of the controller;

[0014] The second current output circuit is used to output a third current pulse signal with the same period as the first current pulse signal, a smaller duty cycle than the second current pulse signal, and a current value of the current pulse smaller than the first preset value under the control of the controller.

[0015] Optionally, the current output circuit includes: a first switch tube, a bias circuit and a constant current module; wherein:

[0016] The first switch tube, the constant current module and the laser module are connected in series between the power supply and the ground;

[0017] The first switch tube is used to be intermittently turned on under the control of the controller; the waveform of the control signal of the first switch tube is the same as the current pulse signal output by the current output circuit;

[0018] The constant current module is used to keep the current flowing through itself constant at a set value under the control of the controller;

[0019] The bias circuit is used to provide the first switch tube with a bias voltage or a bias current required for operation.

[0020] Optionally, the constant current module includes: a current regulation module, a sampling module and an operational amplifier module; wherein:

[0021] The current regulating module is connected in series to the circuit where the first switch tube is located;

[0022] The output end of the sampling module is connected to the inverting input end of the operational amplifier module, and the sampling module is used to sample the actual current value of the circuit where the current regulating module is located;

[0023] The in-phase input terminal of the operational amplifier module is connected to the controller, the output terminal of the operational amplifier module is connected to the control terminal of the current regulation module, and the operational amplifier module is used to adjust the current regulation module according to the actual current value and the set value.

[0024] Optionally, the current regulating module includes: a second switch tube of the same type as the first switch tube.

[0025] Optionally, the first switch tube is an NPN transistor;

[0026] At least the laser module is connected in series between the collector of the first switch tube and the power supply;

[0027] The bias circuit includes: a bias resistor branch, one end of the bias resistor branch is connected to the emitter of the first switch tube, and the other end of the bias resistor branch is grounded.

[0028] Optionally, the current output circuit further includes: a first current limiting resistor branch, a first inductor branch, and a third switch tube of the same type as the first switch tube; wherein:

[0029] The third switch tube, the first current limiting resistor branch, and the constant current module are connected in series between the power supply and the ground;

[0030] The third switch tube is used to be turned on alternately with the first switch tube under the control of the controller;

[0031] One end of the first inductor branch is connected to the power supply, and the other end of the first inductor branch is respectively connected to: one end of the series branch formed by the third switch tube, the first current limiting resistor branch, and the constant current module, and one end of the series branch formed by the first switch tube, the constant current module, and the laser module.

[0032] Optionally, the current output circuit further includes: a selection circuit; wherein:

[0033] The selection circuit is provided with at least two input terminals, and each input terminal of the selection circuit receives each output value output by the controller respectively;

[0034] The selection circuit is used to select the corresponding output value as the set value under the control of the controller.

[0035] Optionally, the current output circuit further includes: a first RC absorption circuit, and / or at least one inductor branch; wherein:

[0036] The first RC absorption circuit is connected in parallel with the laser module;

[0037] Each inductor branch is connected in series between the laser module and the ground.

[0038] On the other hand, the present application provides a power amplifier of a master oscillator, comprising: an amplifier and a master oscillator as described in any one of the previous aspects of the present application.

[0039] It can be seen from the above technical solution that the present invention provides a master oscillator. In the master oscillator, since the waveform of the seed laser signal is consistent with the waveform of the current signal, the seed laser signal includes a laser pulse signal and a laser signal with a constant laser intensity before each laser pulse and less than a certain value, so the laser signal with a constant laser intensity before the laser pulse and less than a certain value enters the amplifier before the laser pulse. In other words, the laser signal with a constant laser intensity before the laser pulse and a smaller laser intensity enters the amplifier before the laser pulse; and since the laser signal with a constant laser intensity before the laser pulse and less than a certain value can control the slow release of the inversion particle number in the gain medium in the amplifier, when the laser pulse enters the amplifier, the inversion particle number in the gain medium presents a Gaussian pulse shape release, so the leading edge overshoot and trailing edge tailing of the amplified laser signal can be suppressed, thereby improving the uneven distribution of the energy waveform of the amplified laser signal in the time domain; thereby, the amplified laser signal can be efficiently amplified, that is, the laser power and energy of the amplified laser signal meet the standards; and, damage to optical devices during the amplification process is avoided; in addition, the quality of precision processing such as laser cutting, punching, and scribing is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0041] Figure 1 A schematic structural diagram of an implementation of a power amplifier of a master oscillator provided in the present application;

[0042] Figure 2 is the current I 流 、Current I 脉冲2 、Current I 脉冲3 Waveform diagram of ;

[0043] Figure 3 A schematic structural diagram of another implementation of a power amplifier of a master oscillator provided in the present application;

[0044] Figure 4 A schematic diagram of a structure of an implementation scheme of a current output circuit provided in the application;

[0045] Figure 5 Schematic diagram of waveforms of control signals U1_out1, U1_out2, T_out1, T_out2, and U3_out;

[0046] Figure 6 Schematic diagram of waveforms of control signals U2_out1, U2_out2, T_out3, T_out4, and U3_out;

[0047] Figure 7 A schematic structural diagram of another implementation of the current output circuit provided in the present application;

[0048] Figure 8-Figure 17 The schematic diagrams of the structures of ten implementation modes of the current output circuit provided in the present application are shown respectively;

[0049] Fig.18 A schematic diagram of a specific example of a driving circuit provided in the present application;

[0050] Fig.19 is a schematic diagram of experimental results of a simulation experiment when the master oscillator provided by the present application is not used;

[0051] Fig. 20 It is a schematic diagram of experimental results of a simulation experiment when the master oscillator provided by the present application is used. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0053] In this application, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0054] In order to improve the uneven distribution of the energy waveform of the amplified laser signal in the time domain, the present application embodiment provides a master oscillator, whose specific structure is as follows: Figure 1 As shown, it specifically includes: a laser module 10, a driving circuit 20 and a controller 30; the connection relationship between the various components is specifically described as follows:

[0055] The output end of the driving circuit 20 is connected to the power supply end of the laser module 10. The driving circuit 20 is used to output a current signal to the laser module 10 according to a preset period under the control of the controller 30, or the driving circuit 20 is used to continuously output a current signal to the laser module 10 under the control of the controller 30.

[0056] The current signal includes a first current pulse signal and a constant current signal whose current value before each current pulse is less than a first preset value.

[0057] Among them, a current value less than the first preset value indicates that the current value is small. In practical applications, the first preset value can be set according to actual conditions, and no specific limitation is made here. In addition, the current value of the current pulse of the first current pulse signal is set according to the actual conditions of the laser module 10, and no specific limitation is made here.

[0058] In practical applications, the preset period represents the output frequency of the laser module 10. When the preset period is smaller, the output frequency of the laser module 10 is larger. At this time, the output of the laser module 10 can be approximately regarded as continuous output. Compared with the real continuous output, the devices in the driving circuit 20 will not be continuously turned on, thereby avoiding damage to the devices in the driving circuit 20. Among them, the preset period is set according to the actual situation of the laser module 10 and is not specifically limited here.

[0059] For example, taking the example that the driving circuit 20 outputs a current signal according to a preset period, the current signal is as follows: Figure 2 I 流 As shown, I1 is the current value of the current pulse in the first current pulse signal, I2 is the current value of the constant current signal, T 预 The preset cycle.

[0060] The output end of the laser module 10 is connected to the input end of the amplifier 40. The laser module 10 is used to emit a waveform and a current signal I 流 The waveform remains consistent with the seed laser signal.

[0061] Optionally, the laser module 10 may be a laser diode. In practical applications, this includes but is not limited to this, which is not specifically limited here and may be determined according to specific circumstances, all of which are within the scope of protection of this application.

[0062] It should be noted that the specific structure of the amplifier 40 is already very mature in the prior art and will not be described in detail here.

[0063] In the master oscillator, since the waveform of the seed laser signal is similar to the current signal I 流The waveform is kept consistent, so the seed laser signal includes the laser pulse signal and the laser signal whose laser intensity before each laser pulse is constant and less than a certain value. Therefore, the laser signal whose laser intensity before the laser pulse is constant and less than a certain value enters the amplifier 40 before the laser pulse. In other words, the laser signal whose laser intensity before the laser pulse is constant and smaller enters the amplifier 40 before the laser pulse. Since the laser signal whose laser intensity before the laser pulse is constant and less than a certain value can control the slow release of the inversion particle number in the gain medium in the amplifier 40, when the laser pulse enters the amplifier 40, the inversion particle number in the gain medium is released in a Gaussian pulse shape, so the leading edge overshoot and trailing edge tailing of the amplified laser signal can be suppressed, thereby improving the uneven distribution of the energy waveform of the amplified laser signal in the time domain; thereby, the amplified laser signal can be efficiently amplified, that is, the laser power and energy of the amplified laser signal meet the standards; and damage to optical devices during the amplification process is avoided; in addition, the quality of precision processing such as laser cutting, punching, and scribing is also avoided.

[0064] Another embodiment of the present application provides a specific implementation of the driving circuit 20, and its specific structure is as follows: Figure 3 As shown, it specifically includes: two current output circuits 21 and 22; the connection relationship between the components is specifically as follows:

[0065] The output ends of the two current output terminals 21 and 22 are both connected to the power supply end of the laser module 10 .

[0066] The control end of the first current output circuit 21 is connected to the controller. The first current output circuit 21 is used to output a second current pulse signal having the same period and duty cycle as the first current pulse signal under the control of the controller 30 .

[0067] For example, taking the example that the driving circuit 20 outputs a current signal according to a preset period, the second current pulse signal is as follows: Figure 2 I 脉冲2 As shown, I3 is the second current pulse signal I 脉冲2 The current value of the current pulse in, and I3=I1-I2.

[0068] The control end of the second current output circuit 22 is connected to the controller. The second current output circuit 22 is used to output the second current pulse signal I with the same period as the first current pulse signal and a duty cycle less than that of the first current pulse signal I under the control of the controller 30. 脉冲2 And a third current pulse signal whose current value is less than the first preset value.

[0069] For example, taking the example that the driving circuit 20 outputs a current signal according to a preset period, the third current pulse signal is as follows: Figure 2 I脉冲3 As shown, I2 is the third current pulse signal I 脉冲3 The current value of the current pulse in.

[0070] The above is only a specific implementation of the driving circuit 20. In practical applications, including but not limited to this, no specific limitation is made here and it can be determined according to the specific situation, all of which are within the protection scope of this application.

[0071] Another embodiment of the present application provides an implementation of a current output circuit, and its specific structure can be found in Figure 4 , specifically comprising: a first switch tube 110, a bias circuit 120 and a constant current module 130; the connection relationship between the components is as follows:

[0072] The first switch tube 110 , the constant current module 130 , and the laser module 10 are connected in series between the power supply 50 and the ground GND.

[0073] Optionally, the first switch tube 110 can be a transistor, such as an NPN transistor, or a MOS tube, such as an N-type MOS tube. In practical applications, including but not limited to these, no specific limitation is made here, and it may depend on the specific circumstances, all within the protection scope of this application.

[0074] In a specific example, if Figure 4 As shown, the first switch tube 110 is an NPN transistor; between the collector of the first switch tube 110 and the power supply 50, at least a laser module 10 is connected in series, for example, Figure 4 In the figure, the laser module 10 is a laser diode Z, the anode of the laser diode Z is connected to the output end of the power supply 50, the cathode of the laser diode Z is connected to the collector of the first switch tube 110, and the constant current module 130 is connected in series between the emitter of the first switch tube 110 and the ground GND.

[0075] The above is only a series connection method between the first switch tube 110, the constant current module 130 and the laser module 10. In practical applications, including but not limited to this, no specific limitation is made here, and it can be determined according to the specific situation, all of which are within the protection scope of this application.

[0076] The control end of the first switch tube 110 is connected to the controller 30 . The first switch tube 110 is used to be intermittently turned on under the control of the controller 30 . The waveform of the control signal of the first switch tube 110 is the same as the current pulse signal output by the current output circuit.

[0077] Taking the case where the driving circuit 20 outputs a current signal according to a preset period as an example, when the first switch tube 110 is an NPN transistor, if the current output circuit is the first current output circuit 21, the waveform of the control signal of the first switch tube 110 is as follows: Figure 5As shown in U1_out1, I 阈1 is the current threshold for turning on the first switch tube 110 at this time; if the current output circuit is the second current output circuit 22, the waveform of the control signal of the first switch tube 110 is as follows Figure 6 As shown in U2_out1, I 阈2 This is the current threshold for turning on the first switch tube 110 .

[0078] The control end of the constant current module 130 is connected to the controller 30 , and the constant current module 130 is used to keep the current flowing through itself constant at a set value under the control of the controller 30 .

[0079] When the current output circuit is the first current output circuit 21, the setting value of the constant current module 130 represents the second current pulse signal I 脉冲2 When the current output circuit is the second current output circuit 22, the setting value of the constant current module 130 represents the third current pulse signal I 脉冲3 The current value of the current pulse in.

[0080] The bias circuit 120 is used to provide the first switch tube 110 with a bias voltage or a bias current required for operation.

[0081] In a specific example, if Figure 4 As shown, the bias circuit 120 includes a bias resistor branch 121, one end of the bias resistor branch 121 is connected to the emitter of the first switch tube 110, and the other end of the bias resistor branch 121 is grounded GND; the base of the first switch tube 110 is connected to the controller 30.

[0082] The bias resistor branch 121 includes at least one bias resistor. If the number of bias resistors is greater than 1, the bias resistors are connected in series and parallel. If the number of bias resistors is equal to 1, the two ends of the bias resistor serve as the two ends of the bias resistor branch 121 respectively.

[0083] The above is only a specific connection method of the bias circuit 120. In practical applications, it includes but is not limited to this. No specific limitation is made here and it can be determined according to specific circumstances. All of them are within the protection scope of this application.

[0084] This embodiment also provides another implementation of the current output circuit, and its specific structure can be found in Figure 7 ( Figure 7 Only in Figure 4 Based on the above embodiment, this embodiment further includes: a first current limiting resistor branch 140, a first inductor branch 150, and a third switch tube 160; the connection relationship between the components is as follows:

[0085] The third switch tube 160 , the first current limiting resistor branch 140 , and the constant current module 130 are connected in series between the power supply 50 and the ground GND; wherein the third switch tube 160 is a switch tube of the same type as the first switch tube 110 .

[0086] Optionally, the third switch tube 160 can be a transistor, such as an NPN transistor, or a MOS tube, such as an N-type MOS tube. In practical applications, including but not limited to these, no specific limitation is made here, and it can be determined according to the specific circumstances, all within the protection scope of this application.

[0087] Among them, the first current limiting resistor branch 140 includes at least one current limiting resistor. If the number of current limiting resistors is greater than 1, each current limiting resistor is connected in series and parallel; if the number of current limiting resistors is equal to 1, the two ends of the current limiting resistor serve as the two ends of the first current limiting resistor branch 140.

[0088] In a specific example, if Figure 7 As shown, the third switch tube 160 is an NPN transistor; the emitter of the third switch tube 160 is connected to the emitter of the first switch tube 110; the collector of the third switch tube 160 is connected to the power supply 50 through the first current limiting resistor branch 140.

[0089] The above is only a series connection method between the third switch tube 160, the first current limiting resistor branch 140, and the constant current module 130. In practical applications, including but not limited to this, no specific limitation is made here, and it can be determined according to the specific situation, all within the protection scope of this application.

[0090] The control end of the third switch tube 160 is connected to the controller 30; the third switch tube 160 is used to alternately conduct with the first switch tube 110 under the control of the controller 30, and the waveform of the control signal of the third switch tube 160 is complementary to the waveform of the control signal of the first switch tube 110.

[0091] Taking the output of the current signal of the driving circuit 20 according to the preset period as an example, when the third switch tube 160 is an NPN transistor, if the current output circuit is the first current output circuit 21, the waveform of the control signal of the third switch tube 160 is as follows: Figure 5 As shown in U1_out2, I 阈3 is the current threshold for turning on the third switch tube 160 at this time; if the current output circuit is the second current output circuit 22, the waveform of the control signal of the third switch tube 160 is as follows Figure 7 As shown in U2_out2, I 阈4 This is the current threshold for turning on the third switch tube 160.

[0092] One end of the first inductor branch 150 is connected to the power supply 50, and the other end of the first inductor branch 150 is respectively connected to: one end of the series branch formed by the third switch tube 160, the first current limiting resistor branch 140, and the constant current module 130, and one end of the series branch formed by the first switch tube 110, the constant current module 130, and the laser module 10.

[0093] The first inductor branch 150 includes at least one inductor. If the number of inductors is greater than 1, each inductor is connected in series and parallel. If the number of inductors is equal to 1, two ends of the inductor serve as two ends of the first inductor branch 150 .

[0094] In a specific example, if Figure 7 As shown, one end of the first inductor branch 150 is connected to the power supply 50, the other end of the first inductor branch 150 is connected to the anode of the laser diode Z, and the other end of the first inductor branch 150 is also connected to the collector of the third switch tube 160 through the first current limiting resistor branch 140.

[0095] The above example is only a specific implementation of the first inductor branch 150. In practical applications, including but not limited to this, no specific limitation is made here, and it can be determined according to specific circumstances, all of which are within the protection scope of this application.

[0096] In this embodiment, since the third switch tube 160 and the first switch tube 110 are turned on alternately, the first inductor branch 150 can store energy when the third switch tube 160 is turned on and discharge when the first switch tube 110 is turned on. Since the inductor has the characteristic of reverse freewheeling voltage, when the first switch tube 110 is turned on, the positive voltage of the power supply end of the laser module 10 is greater than twice the power supply voltage of the power supply 50, so the conduction of the first switch tube 110 can be accelerated, so that the power supply 50 with a lower supply voltage can be used in this embodiment.

[0097] This embodiment also provides another implementation of the current output circuit, and its specific structure can be found in Figure 8 ( Figure 8 Only in Figure 7 Based on the above embodiment, this embodiment further includes: a selection circuit 170; the connection relationship between this device and other devices is as follows:

[0098] The selection circuit 170 is provided with at least two input terminals; each input terminal of the selection circuit 170 is connected to each output terminal of the controller 30 respectively, and receives each output value output by the controller 30 respectively; the output terminal of the selection circuit 170 is connected to the control terminal of the constant current module 130.

[0099] The control end of the selection circuit 170 is connected to the controller 30 , and the selection circuit 170 is used to select the corresponding output value output by the controller 30 as the above-mentioned set value under the control of the controller 30 .

[0100] In a specific example, if Figure 8 As shown, the selection circuit 170 includes a moving contact 171 and two static contacts 172 and 173; each static contact 172 and 173 is respectively connected to each output end of the controller 30, and respectively receives each output value output by the controller 30; the moving contact 171 serves as the output end of the selection circuit 170 and is connected to the control end of the constant current module 130; the moving contact 171 is used to connect the corresponding static contact 172 or 173 with the moving contact 171 under the control of the controller 30.

[0101] It should be noted that, in practical applications, usually, each static contact is connected to the output end of the controller 30 through a resistor, and the control signal output by the controller 30 for controlling the moving contact 171 needs to pass through the resistor. Figure 8 Displayed in.

[0102] The above example is only a specific implementation of the selection circuit 170. In practical applications, including but not limited to this, such as chips with the same functions, etc., are not specifically limited here and can be determined according to specific circumstances, all of which are within the scope of protection of this application.

[0103] This embodiment also provides another implementation of the current output circuit, which is applicable to the case where the bias circuit 120 is a bias resistor branch 121; the specific structure of this implementation can be found in Fig. 9 ( Fig. 9 Only in Figure 8 Based on the above embodiment, this embodiment further includes: a second RC absorption circuit 180; the connection relationship between this device and other devices is as follows:

[0104] The second RC absorption circuit 180 is connected in parallel with the bias resistance branch 121 .

[0105] In a specific example, if Fig. 9 As shown, the second RC absorption circuit 180 includes: a second absorption resistance branch 181 and a second absorption capacitance branch 182 connected in series.

[0106] Among them, the second absorption resistor branch 181 includes at least one absorption resistor. If the number of absorption resistors is greater than 1, each absorption resistor is connected in series and parallel; if the number of absorption resistors is equal to 1, the two ends of the absorption resistor serve as the two ends of the second absorption resistor branch 181.

[0107] The second absorption capacitor branch 182 includes at least one absorption capacitor. If the number of absorption capacitors is greater than 1, each absorption capacitor is connected in series and parallel; if the number of absorption capacitors is equal to 1, the two ends of the absorption capacitor serve as the two ends of the second absorption capacitor branch 182.

[0108] The above example is only a specific implementation of the second RC absorption circuit 180. In practical applications, including but not limited to this, no specific limitation is made here and it can be determined according to the specific situation, all of which are within the protection scope of this application.

[0109] This embodiment also provides another implementation of the current output circuit. The specific structure of the current output circuit can be found in Fig.10 ( Fig.10 Only in Fig. 9 or Fig.11 ( Fig.11 Only in Fig. 9 Based on the above embodiment, this embodiment further includes: a first RC absorption circuit 190, and / or at least one inductor branch; the connection relationship between this device and other devices is as follows:

[0110] The first RC absorption circuit 190 is connected in parallel with the laser module 10 .

[0111] In a specific example, if Fig.10 or Fig.11 As shown, the first RC absorption circuit 190 includes: a first absorption resistance branch 191 and a first absorption capacitance branch 192 connected in series.

[0112] Among them, the first absorption resistor branch 191 includes at least one absorption resistor. If the number of absorption resistors is greater than 1, each absorption resistor is connected in series and parallel; if the number of absorption resistors is equal to 1, the two ends of the absorption resistor serve as the two ends of the first absorption resistor branch 191.

[0113] The first absorption capacitor branch 192 includes at least one absorption capacitor. If the number of absorption capacitors is greater than 1, each absorption capacitor is connected in series and parallel; if the number of absorption capacitors is equal to 1, the two ends of the absorption capacitor serve as the two ends of the first absorption capacitor branch 192.

[0114] The above example is only a specific implementation of the first RC absorption circuit 190. In practical applications, including but not limited to this, no specific limitation is made here and it may be determined according to the specific situation, all of which are within the protection scope of this application.

[0115] Each inductor branch is connected in series between the laser module 10 and the ground GND.

[0116] The inductor branch includes at least one inductor. If the number of inductors is greater than 1, each inductor is connected in series and parallel; if the number of inductors is equal to 1, two ends of the inductor serve as two ends of the inductor branch.

[0117] In a specific example, if Fig.10 As shown, the second inductor branch 210 is connected in series between the emitter of the first switch tube 110 and the constant current module 130 .

[0118] In another specific example, Fig.11 As shown, the third inductor branch 220 is connected in series between the first switch tube 110 and the constant current module 130 , and the fourth inductor branch 230 is connected in series between the first switch tube 110 and the laser diode Z.

[0119] The above examples are only two ways of setting the inductor branch. In practical applications, including but not limited to these, no specific limitation is made here and it can be determined according to the specific situation. All of them are within the scope of protection of this application.

[0120] This embodiment also provides another implementation of the current output circuit, which is applicable to the case where the current output circuit includes the third switch tube 160; the specific structure of this implementation can be seen in Fig.12 ( Fig.12 Only in Fig.11 Based on the above embodiment, this embodiment further includes: at least one inductor branch; the connection relationship between this device and other devices is as follows:

[0121] Each inductor branch is connected in series in the circuit where the third switch tube 160 is located.

[0122] The inductor branch includes at least one inductor. If the number of inductors is greater than 1, each inductor is connected in series and parallel; if the number of inductors is equal to 1, two ends of the inductor serve as two ends of the inductor branch.

[0123] In a specific example, if Fig.12 As shown, the fifth inductor branch 240 is connected in series between the first inductor branch 150 and the first current-limiting resistor branch 140 .

[0124] The above example is only one way of setting the inductor branch. In practical applications, including but not limited to this, no specific limitation is made here. It can be determined according to the specific situation and is within the scope of protection of this application.

[0125] This embodiment also provides another implementation of the current output circuit. The specific structure of the current output circuit can be found in Fig.13 ( Fig.13 Only in Fig.12 Based on the above implementation, it further includes: a second current limiting resistor branch 250; wherein:

[0126] The second current limiting resistor branch 250 is connected in series in a series branch formed by the first switch tube 110 , the laser module 10 , and the constant current module 130 .

[0127] Among them, the second current limiting resistor branch 250 includes at least one current limiting resistor. If the number of current limiting resistors is greater than 1, each current limiting resistor is connected in series and parallel; if the number of current limiting resistors is equal to 1, the two ends of the current limiting resistor serve as the two ends of the second current limiting resistor branch 250.

[0128] In a specific example, if Fig.13 As shown, the second current limiting resistor branch 250 is connected in series between the laser diode and the fourth inductor branch 230 .

[0129] The above example is only one setting method of the second current limiting resistor branch 250. In practical applications, including but not limited to this, no specific limitation is made here and it can be determined according to the specific situation, all of which are within the protection scope of this application.

[0130] The above are only multiple implementations of the current output circuit. In practical applications, including but not limited to these, no specific limitations are made here. It can be determined according to the specific situation and is within the protection scope of this application.

[0131] It should be noted that the first current output circuit 21 can adopt any implementation of the current output circuit provided above, and the second current output circuit 22 can adopt any implementation of the current output circuit provided above.

[0132] Another embodiment of the present application provides an implementation of the constant current module 130. The specific structure can be found in Fig.14 ( Fig.14 Only in Fig.10 or Fig.15 ( Fig.15 Only in Fig.13 ), specifically including: a current regulation module 131, a sampling module 132 and an operational amplifier module 133; the connection relationship between the various components is as follows:

[0133] The current regulating module 131 is connected in series to the circuit where the first switch tube 110 is located.

[0134] In a specific example, if Fig.14 or Fig.15 As shown, the current regulating module 131 is connected in series between the second inductor branch 210 and the ground GND.

[0135] The above is only one implementation of the current regulation module 131. In practical applications, including but not limited to this, no specific limitation is made here and it can be determined according to the specific situation, all of which are within the protection scope of this application.

[0136] The output end of the sampling module 132 is connected to the inverting input end of the operational amplifier module 133 . The sampling module 132 is used to sample the actual current value of the circuit where the current regulating module 131 is located.

[0137] In a specific example, if Fig.14 or Fig.15 As shown, the sampling module 132 includes a sampling resistor branch 1321, which is connected in series between the current regulation module 131 and the ground GND; the connection point between the sampling resistor branch 1321 and the current regulation module 131 serves as the output end of the sampling module 132 and is connected to the inverting input end of the operational amplifier module 133.

[0138] The sampling resistor branch 1321 includes at least one current limiting resistor. If the number of sampling resistors is greater than 1, each sampling resistor is connected in series and in parallel. If the number of sampling resistors is equal to 1, the two ends of the sampling resistor serve as the two ends of the sampling resistor branch 1321 .

[0139] The above example is only one implementation of the sampling module 132. In practical applications, including but not limited to this, no specific limitation is made here and it may be determined according to the specific circumstances, all of which are within the protection scope of this application.

[0140] The in-phase input terminal of the operational amplifier module 133 is connected to the controller 30, and the output terminal of the operational amplifier module 133 is connected to the control terminal of the current regulation module 131. The operational amplifier module 133 is used to adjust the current regulation module 131 according to the above actual current value and the above set value.

[0141] In a specific example, if Fig.14 or Fig.15 As shown, the operational amplifier module 133 includes: an operational amplifier 1331, a peripheral capacitor branch 1332 and three peripheral resistor branches 1333, 1334, and 1335; the in-phase input terminal of the operational amplifier 1331 is connected to one end of the first peripheral resistor branch 1333, and the connection point serves as the in-phase input terminal of the operational amplifier module 133; the other end of the first peripheral resistor branch 1333 is grounded GND; the inverting input terminal of the operational amplifier 1331 is grounded GND through the second peripheral resistor branch 1334 and the sampling resistor branch 1321 in sequence; the output terminal of the operational amplifier 1331 is connected to the output terminal of the operational amplifier module 133 through the third peripheral resistor branch 1335; the output terminal of the operational amplifier 1331 is also grounded GND through the peripheral capacitor branch 1332, the second peripheral resistor branch 1334, and the sampling resistor branch 1321 in sequence.

[0142] Among them, the peripheral capacitor branch 1332 includes at least one peripheral capacitor. If the number of peripheral capacitors is greater than 1, each peripheral capacitor is connected in series and parallel; if the number of peripheral capacitors is equal to 1, the two ends of the peripheral capacitor serve as the two ends of the peripheral capacitor branch 1332.

[0143] The peripheral resistor branch includes at least one peripheral resistor. If the number of the peripheral resistors is greater than 1, each peripheral resistor is connected in series and parallel; if the number of the peripheral resistors is equal to 1, the two ends of the peripheral resistor serve as the two ends of the peripheral resistor branch.

[0144] It should be noted that the topological structure of the operational amplifier 1331 is already very mature in the prior art and will not be described in detail here.

[0145] In a specific example, if Fig.14 or Fig.15 As shown, the current regulating module 131 is a second switch tube 1311 of the same type as the first switch tube 110 .

[0146] When the second switch tube 1311 is an NPN transistor, if the driving circuit 20 outputs a current signal according to a preset period, the signal outputted from the output terminal of the operational amplifier module 133 is as follows: Figure 5 or Figure 6 U3_out in .

[0147] It should be noted that when the second switch tube 1311 plays the role of current regulation, the signal output from the output end of the operational amplifier module 133 will change accordingly and will not be consistently at a high level. However, using the switch tube to play the role of current regulation is a very mature technology and will not be described in detail here. The above-mentioned change of the signal output from the output end of the operational amplifier module 133 will only be replaced by a high level.

[0148] In addition, it should be noted that, usually, the period of the signal outputted from the output end of the operational amplifier module 133 is slightly larger than the preset period, so as to better achieve the constant current effect of the two current output circuits.

[0149] The above example only shows a specific implementation of the current regulation module 131. In practical applications, including but not limited to this, no specific limitation is made here and it may be determined according to the specific situation, all of which are within the scope of protection of this application.

[0150] The above is only a specific implementation of the constant current module 130. In practical applications, including but not limited to this, no specific limitation is made here, and it can be determined according to specific circumstances, all of which are within the protection scope of this application.

[0151] Another embodiment of the present application provides an implementation of a controller, which is applicable to the case where the current output circuit includes a first switch tube and a third switch tube; the specific structure of this implementation can be seen in Fig.16 ( Fig.16 Only in Fig.14 or Fig.17 ( Fig.17 Only in Fig.15 The invention is shown on the basis of FIG. 3 , and specifically includes: a control module 31 and a signal conversion module 32; the connection relationship between the components is specifically as follows:

[0152] The two input ends of the signal conversion module 32 are respectively connected to the two output ends of the control module 31 , the first output end of the signal conversion module 32 is connected to the control end of the first switch tube, and the second output end of the signal conversion module 32 is connected to the control end of the third switch tube.

[0153] It should be noted that, in practical applications, usually, each input end of the signal conversion module 32 is connected to the corresponding output end of the control module 31 through a resistor, and each output end of the signal conversion module 32 is connected to the control end of the corresponding switch tube through a resistor. Fig.16 or Fig.17 Displayed in.

[0154] The signal conversion module 32 is used to turn on the first switch tube and turn off the third switch tube when the two output ends of the control module 31 output high levels at the same time, and to turn off the first switch tube and turn on the third switch tube when the two output ends of the self-control module 31 do not output high levels at the same time.

[0155] It should be noted that the structure of the signal conversion module 32 is already very mature in the prior art and will not be described in detail here.

[0156] In a specific example, when the current output circuit is the first current output circuit, the output signals of the two output terminals of the control module 31 are respectively as follows: Figure 5 As shown in T_out1 and T_out2.

[0157] In another specific example, when the current output circuit is the second current output circuit, the output signals of the two output terminals of the control module 31 are respectively as follows: Figure 6 As shown in T_out3 and T_out4.

[0158] The above are only two implementation methods of the output signals of the two output terminals of the control module 31. In practical applications, including but not limited to these, no specific limitation is made here, and it can be determined according to the specific situation, all of which are within the protection scope of this application.

[0159] The above is only a specific implementation of the controller. In practical applications, including but not limited to this, no specific limitation is made here and it may be determined according to the specific circumstances, all of which are within the scope of protection of this application.

[0160] According to the above embodiments, in practical applications, a specific example of a driving circuit is as follows: Fig.18 As shown, in this example, the working principle of the drive circuit is as follows:

[0161] Pulse timing 1: The two output voltages of the controller are input to the selection circuit 170 through resistors R15 and R16 to provide a threshold current and a setting current; the controller controls the selection circuit 170 through resistor R28 to switch the output of the selection circuit 170 between the threshold current and the setting current; after voltage division by resistor R18, the output of the selection circuit 170 is input to the non-inverting input terminal of the operational amplifier 01; the output terminal of the operational amplifier 01 controls the transistor Q5 through resistor R17.

[0162] When the transistor Q1 is turned on and the transistor Q2 is turned off, the inductor L1 stores energy, and the current passes through the inductor L1, the resistor R1, the transistor Q1, the inductor L4, the transistor Q5, and the resistor R24 ​​to the ground GND. The current generates a feedback voltage on the resistor R24, which is given to the inverting input terminal of the operational amplifier 01 through the resistor R21, forming a closed-loop control of the constant current source circuit; wherein, the inductor L4 suppresses the pulse current oscillation; the capacitor C4 suppresses the oscillation and voltage overshoot of the operational amplifier 01; the resistor R14 provides the bias voltage or bias current for the transistor Q1 and the transistor Q2 to be turned on and off; the capacitor C2 and the resistor R13 form an RC absorption network, which can effectively suppress the oscillation generated when the transistor Q1 and the transistor Q2 are turned on and off.

[0163] Pulse timing 2: The other output voltage of the controller is divided by resistors R22 and R25 and then input to the non-inverting input terminal of operational amplifier 02. The output terminal of operational amplifier 02 controls transistor Q6 via resistor R23.

[0164] When the transistor Q3 is turned on and the transistor Q4 is turned off, the pulse current passes through the inductor L2, the resistor R5, the transistor Q3, the inductor L5, the transistor Q6, and the resistor R27 to the ground GND, and the current generates a feedback voltage on the resistor R27, which is input to the inverting input terminal of the operational amplifier 02 through the resistor R26, forming a closed-loop control of the constant current source circuit; wherein the inductor L2 and the inductor L5 suppress the oscillation of the pulse current, and the capacitor C5 suppresses the oscillation and voltage overshoot of the operational amplifier 02; the resistor R19 provides the bias voltage or bias current when the transistor Q3 and the transistor Q4 are turned on and off; the capacitor C3 and the resistor R20 form an RC absorption network, which can effectively suppress the oscillation generated when the transistor Q3 and the transistor Q4 are turned on and off.

[0165] The T_out3 and T_out4 ports are two control signals output by the controller. T_out3 and T_out4 are respectively input to the two input ends of the second signal conversion module 04 via resistors R10 and R12. One output end of the second signal conversion module 04 controls the transistor Q3 via resistor R9, and the other output end of the second signal conversion module 04 controls the transistor Q4 via resistor R11.

[0166] When T_out3 and T_out4 are both high levels, the signals U2_out1 and U2_out2 output by the second signal conversion module 04 are high level and low level respectively, so that the transistor Q4 is turned on and the transistor Q3 is turned off; when T_out3 and T_out4 are not both high levels, the signals U2_out1 and U2_out2 output by the second signal conversion module 04 are low level and high level respectively, so that the transistor Q4 is turned off and the transistor Q3 is turned on.

[0167] When transistor Q3 is turned off and transistor Q4 is turned on, the pulse current I 脉冲3 The current passes through the laser diode Z, inductor L3, resistor R8, transistor Q4, inductor L5, transistor Q6, and resistor R27 to the ground GND. The current generates a feedback voltage on the resistor R27 and is given to the inverting input terminal of the operational amplifier O2 through the resistor R26, forming a closed-loop control of the constant current source circuit; among them, the inductor L3 and the inductor L5 suppress the oscillation of the pulse current.

[0168] Pulse timing 3: T_out1 and T_out2 are two control signals output by the controller. T_out1 and T_out2 are respectively input to the two input ends of the first signal conversion module 03 via resistors R3 and R6. One output end of the first signal conversion module 03 controls transistor Q1 via resistor R4, and the other output end of the first signal conversion module 03 controls transistor Q2 via resistor R7.

[0169] When T_out1 and T_out2 are both high levels, the signals U1_out1 and U1_out2 output by the first signal conversion module 03 are high level and low level respectively, so that the transistor Q2 is turned on and the transistor Q1 is turned off; when T_out1 and T_out2 are not both high levels, the signals U1_out1 and U1_out2 output by the first signal conversion module 03 are low level and high level respectively, so that the transistor Q2 is turned off and the transistor Q1 is turned on.

[0170] When transistor Q1 is turned off and transistor Q2 is turned on, inductor L1 discharges. Due to the reverse characteristic of the inductor freewheeling voltage, a voltage higher than the power supply is instantly generated at the anode of the laser diode to accelerate the conduction of transistor Q2. The pulse current I 脉冲2The current passes through the inductor L1, the laser diode Z, the transistor Q2, the inductor L4, the transistor Q5, and the resistor R24 ​​to the ground GND. The current generates a feedback voltage on the resistor R24 ​​and is given to the inverting input terminal of the operational amplifier 01 through the resistor R21, forming a closed-loop control of the constant current source circuit; among them, the inductor L4 suppresses the oscillation of the pulse current; the capacitor C1 and the resistor R1 form an RC absorption network, which can effectively suppress the oscillation caused by high-speed pulse modulation.

[0171] When the main oscillator provided by the present application is not used, the results of the simulation test are as follows Fig.19 After adopting the master oscillator provided by the present application, the simulation test results are as shown in Fig. 20 As shown; compared with the two, the master oscillator provided in the present application can indeed suppress the leading edge overshoot and trailing edge tailing of the amplified laser signal, thereby improving the uneven distribution of the energy waveform of the amplified laser signal in the time domain.

[0172] Another embodiment of the present application provides a power amplifier of a master oscillator, and its specific structure is as follows: Figure 1 As shown, it specifically includes: an amplifier 40 and a master oscillator 100 provided in the above embodiment.

[0173] It should be noted that the connection between the amplifier 40 and the master oscillator 100 has been described in detail in the above embodiment and will not be repeated here.

[0174] For the above description of the disclosed embodiments, the features recorded in each embodiment in this specification can be replaced or combined with each other, so that professionals in the field can implement or use the present application. The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with a preferred embodiment, it is not used to limit the present invention. Any technician familiar with the field can make many possible changes and modifications to the technical solution of the present invention using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A master oscillator, characterized in that: include: Laser module, drive circuit and controller; wherein: The output end of the driving circuit is connected to the power supply end of the laser module, and the driving circuit is used to output a current signal to the laser module according to a preset period or continuously under the control of the controller; The current signal includes a first current pulse signal and a constant current signal whose current value before each current pulse is less than a first preset value; The driving circuit includes: two current output circuits; wherein: the output ends of the two current output circuits are connected to the power supply end of the laser module; the first current output circuit is used to output a second current pulse signal having the same period and duty cycle as the first current pulse signal under the control of the controller; the second current output circuit is used to output a third current pulse signal having the same period as the first current pulse signal, a smaller duty cycle than the second current pulse signal, and a current value of the current pulse being smaller than the first preset value under the control of the controller; The current output circuit includes: a first switch tube, a constant current module, a first inductor branch, and a third switch tube of the same type as the first switch tube, the first switch tube, the constant current module, and the laser module are connected in series between the power supply and the ground, the third switch tube and the constant current module are connected in series between the power supply and the ground, one end of the first inductor branch is connected to the power supply, and the other end of the first inductor branch is respectively connected to: one end of the series branch formed by the third switch tube and the constant current module, and one end of the series branch formed by the first switch tube, the constant current module and the laser module; The first switch tube is used to be turned on at intervals under the control of the controller, the waveform of the control signal of the first switch tube is the same as the current pulse signal output by the current output circuit, the third switch tube is used to be turned on alternately with the first switch tube under the control of the controller, and the constant current module is used to keep the current flowing through itself constant at a set value under the control of the controller; The output end of the laser module is connected to the input end of the amplifier, and the laser module is used to emit a seed laser signal whose waveform is consistent with the waveform of the current signal.

2. The master oscillator according to claim 1, characterized in that The current output circuit further includes: a bias circuit; The bias circuit is used to provide the first switch tube with a bias voltage or a bias current required for operation.

3. The master oscillator according to claim 1, characterized in that The constant current module includes: a current regulation module, a sampling module and an operational amplifier module; wherein: The current regulating module is connected in series to the circuit where the first switch tube is located; The output end of the sampling module is connected to the inverting input end of the operational amplifier module, and the sampling module is used to sample the actual current value of the circuit where the current regulating module is located; The in-phase input terminal of the operational amplifier module is connected to the controller, the output terminal of the operational amplifier module is connected to the control terminal of the current regulation module, and the operational amplifier module is used to adjust the current regulation module according to the actual current value and the set value.

4. The master oscillator according to claim 3, characterized in that The current regulating module includes: a second switch tube of the same type as the first switch tube.

5. The master oscillator according to claim 2, characterized in that The first switch tube is an NPN transistor; At least the laser module is connected in series between the collector of the first switch tube and the power supply; The bias circuit includes: a bias resistor branch, one end of the bias resistor branch is connected to the emitter of the first switch tube, and the other end of the bias resistor branch is grounded.

6. The master oscillator according to claim 1, characterized in that The current output circuit further includes: a first current limiting resistor branch; wherein: The third switch tube, the first current limiting resistor branch, and the constant current module are connected in series between the power supply and the ground.

7. The master oscillator according to claim 1, characterized in that The current output circuit also includes: a selection circuit; wherein: The selection circuit is provided with at least two input terminals, and each input terminal of the selection circuit receives each output value output by the controller respectively; The selection circuit is used to select the corresponding output value as the set value under the control of the controller.

8. The master oscillator according to claim 1, characterized in that The current output circuit further includes: a first RC absorption circuit, and / or at least one inductor branch; wherein: The first RC absorption circuit is connected in parallel with the laser module; Each inductor branch is connected in series between the laser module and the ground.

9. A power amplifier for a master oscillator, characterized in that: include: An amplifier and a master oscillator as claimed in any one of claims 1 to 8.

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