Multi-module synchronous or asynchronous pulse laser control circuit and laser equipment

Abstract

The invention provides a multi-module synchronous or asynchronous pulse laser control circuit and laser equipment. The multi-module synchronous or asynchronous pulse laser control circuit comprises a single-chip microcomputer controller, a pulse logic processing unit, a pulse amplitude modulation circuit, a laser global enabling switch circuit, a plurality of pulse control circuits and a plurality of laser driving circuits. The pulse control circuits are in one-to-one correspondence with the laser driving circuits. According to the embodiment of the invention, synchronous / asynchronous control can be carried out on the high-precision time sequence of the plurality of lasers, so that the plurality of pulse lasers are output in turn in the time domain, the high synchronization of the pulse lasers output by each laser can be realized, the peak power is ensured to reach a set index, and a better laser combination output effect is achieved.

Description

Technical Field

[0001] The present invention relates to the field of laser technology, in particular to a multi-module synchronous or asynchronous pulse laser control circuit and laser equipment. Background Art

[0002] For application scenarios that require higher power laser output, multiple laser modules can be used to work together. However, multiple laser modules generate drive signals through corresponding control circuits, which are prone to drive signal asynchrony and other problems, resulting in abnormal superposition of the combined output laser waveform and peak power failing to meet the design indicators.

[0003] At present, the control scheme for the coordination of multiple laser modules is usually based on the relative sequence control of the laser output of each module by a delay generator. Although superposition synchronization can be achieved, there are delay errors and insufficient control accuracy, and satisfactory laser merging output effects cannot be achieved. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a multi-module synchronous or asynchronous pulse laser control circuit, comprising: a single-chip microcomputer controller, a pulse logic processing unit, a pulse amplitude modulation circuit, a laser global enable switch circuit, multiple pulse control circuits and multiple laser driving circuits; the pulse control circuit corresponds to the laser driving circuit one by one; the single-chip microcomputer controller is used to receive human-computer interaction parameters, and generate a PWM signal source, pulse modulation parameters and control instructions according to the human-computer interaction parameters, the pulse modulation parameters include pulse amplitude parameters and other modulation parameters, and the control instructions include synchronous / asynchronous output mode instructions, laser channel selection instructions and laser channel enable control instructions; and, send the other modulation parameters, the synchronous / asynchronous output mode instructions, and the laser channel selection instructions to the pulse logic processing unit, send the pulse amplitude parameters and the laser channel selection instructions to the pulse amplitude modulation circuit, and send the laser channel enable control instructions to the laser global enable switch circuit; the pulse logic processing unit is used to generate each of the pulses according to the PWM signal source, the other modulation parameters, the synchronous / asynchronous output mode instructions, and the laser channel selection instructions. The laser control circuit corresponds to the laser pulse PWM; the pulse amplitude modulation circuit is used to generate the laser pulse amplitude modulation signal corresponding to each of the pulse control circuits according to the pulse amplitude parameter and the laser channel selection instruction; the pulse logic processing unit, the pulse amplitude modulation circuit and all the pulse control circuits are respectively connected; all the pulse control circuits are connected to the laser global enable switch circuit, and the laser global enable switch circuit is connected to all the laser driving circuits; each of the pulse control circuits is arranged in parallel, the input end of each of the pulse control circuits is connected to the pulse logic processing unit and the pulse amplitude modulation circuit, and the output end is connected to the laser global enable switch circuit; each of the pulse control circuits is used to generate a laser pulse signal according to the corresponding laser pulse PWM and the corresponding laser pulse amplitude modulation signal; and, the laser pulse signal is output to the corresponding laser driving circuit through the laser global enable switch circuit; the laser global enable switch circuit is used to control the corresponding laser channel switch according to the laser channel enable control instruction; each of the laser driving circuits is used to drive the laser to operate according to the corresponding laser pulse signal.

[0005] The embodiment of the present invention can perform synchronous / asynchronous control on the high-precision timing of multiple lasers so that multiple pulse lasers are output in turn in the time domain, thereby achieving high synchronization of the pulse lasers output by each laser, ensuring that the peak power reaches the set index, and achieving a better laser merging output effect.

[0006] Optionally, the laser global enable switch circuit includes multiple independent switch units; each of the switch units corresponds one-to-one to the pulse control circuit and one-to-one to the laser drive circuit; after the laser channel enable control instruction is input into the switch unit, the switch unit controls whether the corresponding laser drive circuit is running in response to the laser channel enable control instruction.

[0007] The specific structure of the laser global enable switch circuit is defined in the embodiment of the present invention, and each independent switch unit can control the operation of the laser driving circuit of each channel based on the laser channel enable control instruction, thereby realizing multi-channel synchronous / asynchronous pulse laser control.

[0008] Optionally, the other modulation parameters include: frequency, pulse width, number of pulses, and pulse configuration mode.

[0009] In the embodiment of the present invention, the pulse logic processing unit completes the control of the frequency, pulse width, number of pulses, pulse configuration mode and channel selection of the laser pulse signal according to the setting parameters of the single chip controller.

[0010] Optionally, the pulse control circuit includes a first operational amplifier unit, a switch chip and a second operational amplifier unit; the laser pulse amplitude modulation signal is input into the first operational amplifier unit, and the first operational amplifier unit outputs a signal to the switch chip; the switch chip also receives the laser pulse PWM corresponding to the same laser channel as the laser pulse amplitude modulation signal, and outputs a signal to the second operational amplifier unit.

[0011] In the embodiment of the present invention, the specific structure of the pulse control circuit is defined. Based on the laser pulse amplitude modulation signal and the laser pulse signal composed of the laser pulse PWM, the laser channel selection and output enable control are realized through operational amplifier buffering, amplification, switch judgment, etc.

[0012] Optionally, the pulse logic processing unit is used to perform frequency division modulation on the PWM signal source with the number of channels corresponding to the laser channel selection instruction as the frequency division number, so as to generate laser pulse PWM with the same frequency for each laser; the number of pulses in one cycle of each laser pulse PWM is equal, and the pulses of each laser pulse PWM do not overlap.

[0013] The pulse logic processing unit in the embodiment of the present invention performs pulse logic timing control and logic control on any or all specific channels, and can realize output / stop control of a single pulse, output / stop control of a pulse train, and arbitrary editing of pulses in a specific channel.

[0014] Optionally, the pulse phases of two adjacent laser pulses PWM differ by one cycle.

[0015] In the embodiment of the present invention, a rotation mechanism output control is adopted, and the laser pulses of each channel work in a periodic rotation manner, so there is almost no waste heat accumulation in the working process of the laser and the driver of each channel, so as to optimize the long-term stable operation of the laser.

[0016] Optionally, the pulse logic processing unit is used to perform frequency division modulation on the PWM signal source with the number of channels corresponding to the laser channel selection instruction as the frequency division number, so as to generate laser pulse PWM with the same frequency for each laser; the number of pulses in one cycle of any two laser pulse PWMs is not equal, and the pulses of each laser pulse PWM do not overlap.

[0017] The pulse logic processing unit of the embodiment of the present invention performs pulse logic timing control and logic control on any or all specific channels, and can realize output / stop control of a single pulse, output / stop control of a pulse train, and arbitrary editing of pulses in a specific channel.

[0018] Optionally, the single chip microcomputer controller and the pulse logic processing unit store embedded software, and the embedded software is used for changing / increasing or decreasing laser channels.

[0019] The circuit implementation method of each channel in the embodiment of the present invention is the same, and the control of the laser pulse channel can be achieved by only programming the embedded software of the single-chip microcomputer controller and the pulse logic processing unit.

[0020] Optionally, a clock generator circuit is also included; the clock generator circuit is used to generate a system reference clock signal source of a preset frequency, and provide a clock signal to the single-chip microcomputer controller and the pulse logic processing unit.

[0021] The control circuit of the embodiment of the present invention further includes a clock generator circuit which can provide a reference clock signal source.

[0022] An embodiment of the present invention provides a laser device, comprising the multi-module synchronous or asynchronous pulse laser control circuit described in any one of the above items, multiple lasers and a synthesis output module; the multiple lasers are connected to the multiple laser driving circuits in a one-to-one correspondence; the synthesis output module is used to combine the laser beams output by the multiple lasers and output them.

[0023] The laser device provided by the embodiment of the present invention can achieve the same technical effect as the above-mentioned multi-module synchronous or asynchronous pulse laser control circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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.

[0025] Figure 1 A schematic diagram of the structure of a multi-module synchronous or asynchronous pulse laser control circuit provided by an embodiment of the present invention; Figure 2 A simplified schematic diagram of an ARM microcontroller provided in an embodiment of the present invention; Figure 3 A simplified schematic diagram of an FPGA pulse logic processing unit provided by an embodiment of the present invention; Figure 4 A schematic diagram of a pulse amplitude modulation circuit provided by an embodiment of the present invention; Figure 5 A channel 1 pulse control circuit and a global switch control circuit provided by an embodiment of the present invention; Figure 6 A timing diagram of synchronous / asynchronous beam combining modulation of 6-channel laser pulses provided in an embodiment of the present invention; Figure 7 A timing diagram of PWM pulse signal modulation with two-way alternating output in timing provided by an embodiment of the present invention; Figure 8 A timing diagram of PWM pulse signal modulation with two symmetrical pulse trains alternately outputted according to an embodiment of the present invention; Fig. 9 A timing diagram of PWM pulse signal modulation with two asymmetric pulse trains alternately outputted in an embodiment of the present invention; Fig.10 Schematic diagram of the laser pulse modulation and driving circuit of channel 1 provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] The embodiment of the present invention provides a multi-module synchronous or asynchronous pulse laser control circuit and laser equipment, which can synchronously / asynchronously control the high-precision timing of multiple lasers so that multiple pulse lasers are output in turn in the time domain, and can achieve high synchronization of the pulse lasers output by each laser, ensuring that the peak power reaches the set index, and achieving a better laser merging output effect.

[0028] The embodiment of the present invention provides a multi-module synchronous or asynchronous pulse laser control circuit, which includes: a single-chip microcomputer controller, a pulse logic processing unit, a pulse amplitude modulation circuit, a laser global switch circuit, multiple pulse control circuits and multiple laser driving circuits.

[0029] The number of pulse control circuits and laser driving circuits is equal and corresponds to each other in terms of control relationship. Each laser driving circuit is used to drive one laser, that is, one laser channel. The pulse logic processing unit and the pulse amplitude modulation circuit are connected to all pulse control circuits respectively; all pulse control circuits are connected to the laser global switch circuit, and the laser global switch circuit is connected to all laser driving circuits.

[0030] Figure 1 A structural schematic diagram of a multi-module synchronous or asynchronous pulse laser control circuit provided by an embodiment of the present invention is shown, wherein a single-chip microcomputer controller is respectively connected to a pulse logic processing unit, a pulse amplitude modulation circuit, a laser global switch circuit, and multiple pulse control circuits; the pulse logic processing unit and the pulse amplitude modulation circuit are both connected to multiple pulse control circuits; and multiple pulse control circuits are connected to corresponding laser driving circuits via the laser global switch circuit.

[0031] exist Figure 1 Taking an 8-channel synchronous / asynchronous pulse laser controller circuit as an example, the pulse control circuit includes Ch1-Ch8 pulse control circuits, the laser driving circuit includes Ch1-Ch8 laser driving circuits, and the laser includes Ch1-Ch8 lasers.

[0032] Specifically, the single-chip microcomputer controller is the core control platform of the multi-module high-precision synchronous / asynchronous pulse laser control circuit, receives human-computer interaction parameters, and completes the generation and monitoring of control instructions and parameters. For example, the single-chip microcomputer controller adopts an ARM single-chip microcomputer controller, and the pulse logic processing unit adopts an FPGA (Field Programmable Gate Array) pulse logic processing unit.

[0033] The single-chip microcomputer controller can receive human-computer interaction parameters, and generate PWM (Pulse width modulation) signal source, pulse modulation parameters and control instructions according to the human-computer interaction parameters. The pulse modulation parameters include pulse amplitude parameters and other modulation parameters, and the control instructions include synchronous / asynchronous output mode instructions, laser channel selection instructions and laser channel enable control instructions. The single-chip microcomputer controller sends the above-mentioned other modulation parameters, synchronous / asynchronous output mode instructions, and laser channel selection instructions to the pulse logic processing unit, sends pulse amplitude parameters and laser channel selection instructions to the pulse amplitude modulation circuit, and sends laser channel enable control instructions to the laser global switch circuit.

[0034] The functions of the single-chip microcomputer controller include: generating laser pulse signal source PWM, setting laser modulation pulse parameters (such as frequency, pulse width, number of pulses, pulse configuration, etc.) to FPGA, synchronous / asynchronous output mode, setting laser pulse amplitude (i.e. driving current) parameters to the pulse amplitude modulation circuit, selecting laser pulse channel, controlling laser global enable, and finally controlling laser output.

[0035] In addition to the actual synchronous / asynchronous pulse output function, the microcontroller controller can accept external real-time control demand information to complete the control requirements of pulse output, and can also save the setting demand information in advance and complete the pulse output control according to the preset parameters.

[0036] In this embodiment, the timer pin of the ARM microcontroller is used to generate a laser pulse modulation PWM signal source, and the standard SPI (Serial Peripheral Interface) of the ARM microcontroller is used to communicate with the FPGA to complete the transmission of laser pulse control parameters and control instructions. The SPI interface communicates with the DAC (Digital-to-Analog Converter) chip of the laser pulse amplitude modulation to complete the amplitude control of the laser pulse. The GPIO (General-purpose input / output) of the ARM microcontroller is used to connect the analog switch chip of the pulse control circuit to complete the selection of the laser pulse channel and the control of the laser switch.

[0037] Figure 2 It is a simplified schematic diagram of the ARM microcontroller, showing the laser pulse amplitude parameter CUR_SET output by the ARM microcontroller, the laser pulse modulation PWM signal source LASER_PWM, the laser pulse control parameter PWM_SET, the laser global enable signal Ch_En, and the laser pulse channel switch signal LASER_GATE.

[0038] Specifically, the pulse logic processing unit can generate the laser pulse PWM corresponding to each pulse control circuit according to the PWM signal source, other modulation parameters, synchronous / asynchronous output mode instructions, and laser channel selection instructions.

[0039] The pulse logic processing unit can perform pulse logic timing control and logic control on any or all channels. In addition to synchronous / asynchronous control of pulses, it can also realize output / stop control of a single pulse, output / stop control of a pulse train, and arbitrary editing of pulses in a specific channel.

[0040] Exemplarily, in this embodiment, the pulse logic processing unit is programmed with GPIO in combination with a hardware description language to complete the simulation of the SPI communication interface, and communicate with the SPI of the single-chip microcomputer controller to complete the interaction of data and instructions. According to the setting parameters from the single-chip microcomputer controller and the PWM signal source, a logical pulse logic operation is performed to complete the generation of laser pulse PWM of multiple channels. According to the setting parameters of the single-chip microcomputer controller, the control of the frequency, pulse width, number of pulses, pulse configuration mode, channel selection and other parameters of the laser pulse signal is completed.

[0041] Figure 3 It is a simplified schematic diagram of the FPGA pulse logic processing unit, showing the PWM signal source LASER_PWM input to the FPGA pulse logic processing unit, the laser pulse control parameter PWM_SET, and the PWM signal source LASER_PWM[0…N] output by the FPGA pulse logic processing unit corresponding to each pulse control circuit.

[0042] Specifically, the pulse amplitude modulation circuit can generate a laser pulse amplitude modulation signal corresponding to each pulse control circuit according to the pulse amplitude parameter and the laser channel selection instruction.

[0043] The pulse amplitude modulation circuit in this embodiment can use a multi-channel DAC chip with an SPI interface to receive setting parameters from the SIP communication interface of the single-chip controller to generate laser pulse amplitude modulation signals of multiple channels, that is, current-driven analog signals. The high and low levels of this analog signal control the amplitude value of the laser pulse, thereby realizing laser pulse amplitude modulation.

[0044] Figure 4 It is a schematic diagram of a pulse amplitude modulation circuit, showing 8-channel laser pulse amplitude modulation signals DAC1-DAC8, and also showing capacitors C8, C9, and chip U5.

[0045] The pulse logic processing unit and pulse amplitude modulation circuit are connected to all pulse control circuits respectively; all pulse control circuits are connected to the laser global switch circuit, and the laser global switch circuit is connected to all laser driving circuits. Each pulse control circuit is arranged in parallel, and the input end of each pulse control circuit is connected to the pulse logic processing unit and the pulse amplitude modulation circuit, and the output end is connected to the laser global switch circuit; Specifically, each pulse control circuit is used to generate a laser pulse signal according to a corresponding laser pulse PWM and a corresponding laser pulse amplitude modulation signal; and output the laser pulse signal to a corresponding laser driving circuit through a laser global switch circuit.

[0046] The laser global enable switch circuit is used to control the corresponding laser channel switch according to the laser channel enable control instruction. The laser global enable switch circuit includes multiple independent switch units; each switch unit corresponds to the pulse control circuit one by one, and corresponds to the laser drive circuit one by one; after the laser channel enable control instruction is input into the switch unit, the switch unit responds to the laser channel enable control instruction to control whether the corresponding laser drive circuit is running.

[0047] Optionally, the pulse control circuit includes a first operational amplifier unit, a switch chip and a second operational amplifier unit. The laser pulse amplitude modulation signal is input into the first operational amplifier unit, and the first operational amplifier unit outputs a signal to the switch chip. The switch chip also receives a laser pulse PWM corresponding to the same laser channel as the laser pulse amplitude modulation signal, and outputs a signal to the second operational amplifier unit.

[0048] In this embodiment, the pulse control circuit and the laser global enable switch circuit control and process the laser pulse signal composed of the amplitude modulation signal output by the single-chip controller and the pulse modulation signal output by the pulse logic processing unit through the operational amplifier buffer, amplification, and pulse speed compensation circuit to achieve laser channel selection and output enable control, and send the target laser pulse signal to the laser drive circuit.

[0049] Figure 5 The pulse control circuit of channel 1 and the global switch control circuit are shown in Figure 1. Channel 1 is used as an example for explanation. The circuit structures of other channels are the same. The circuit implementation method of each channel in the control system is the same. Only the embedded software needs to be programmed to realize the control of the laser pulse channel.

[0050] like Figure 5 As shown, Ch1 pulse laser amplitude value modulation signal DAC1 is input to op amp U6B, Ch1 laser PWM pulse modulation signal PWM_LASER1 is input to chip U7, Ch1 laser enable signal LASER_EN1 is input to chip U8, and laser switch signal LASER_GATE is input to chip U30. Figure 5The rightmost part is the laser pulse falling edge acceleration unit. Figure 5 Capacitors C10, C11, C12, C13, C14, C74, C82 and resistors R15, R16 are also specifically shown.

[0051] In addition to synchronous or asynchronous control, the laser global enable switch circuit can randomly control the laser pulse enable or disable of a certain channel according to actual needs to achieve the required control requirements. However, the global enable signal controls the channel pulse output / stop and cannot be used to control the output / stop of a certain pulse. Regardless of whether it is in the laser output process, it can control the output / stop of any or all channel pulses.

[0052] Each of the above laser driving circuits is used to drive the laser to operate according to the corresponding laser pulse signal. In the laser driving circuit of this embodiment, the laser pulse signal source is driven and fed back by an operational amplifier and a power field effect transistor to complete the output drive of the pulsed laser. Exemplarily, the circuit implementation method of each channel is the same, and the control of the laser pulse channel can be realized by programming the embedded software.

[0053] Furthermore, the multi-module synchronous or asynchronous pulse laser control circuit further includes a clock generator circuit; the clock generator circuit can generate a system reference clock signal source of a preset frequency, and provide a clock signal to the single-chip microcomputer controller and the pulse logic processing unit. Figure 1 As shown, the clock generator circuit is connected to the single-chip microcomputer controller and the pulse logic processing unit to generate a 25MHz system reference clock signal source to provide clock signals for the ARM single-chip microcomputer controller circuit and the FPGA pulse logic processing unit.

[0054] The above-mentioned single-chip microcomputer controller and pulse logic processing unit store embedded software, and the embedded software is used to change / increase or decrease the laser channels. In actual applications, the number of laser channels is not fixed and can be increased or decreased. When increasing, it is only necessary to expand and increase the channel module according to the above-mentioned circuit architecture; when decreasing, it is only necessary to modify the increase / decrease of channels in the embedded software of the single-chip microcomputer controller and the pulse logic processing unit.

[0055] As one of the feasible methods, the pulse logic processing unit performs frequency division modulation on the PWM signal source with the number of channels corresponding to the laser channel selection instruction as the frequency division number, so as to generate laser pulse PWM with the same frequency for each laser; the number of pulses in one cycle of each laser pulse PWM is equal, and the pulses of each laser pulse PWM do not overlap.

[0056] Furthermore, the pulse phases of the two adjacent laser pulses PWM are different by one cycle.

[0057] Figure 6A timing diagram of synchronous / asynchronous beam combining modulation of 6-channel laser pulses provided in an embodiment of the present invention. When the 6 lasers are output asynchronously, the single-chip microcomputer controller generates a 15kHz PWM signal source, and the pulse logic processing unit performs frequency division modulation on the 15kHz PWM signal source according to the frequency division number 6 to obtain 6 low-frequency 2.5kHz PWM signals, and each PWM signal is staggered by one cycle of the PWM signal source in turn, and multiple PWM signals are sent to each target laser module so that each laser outputs a laser of the corresponding frequency, and then the lasers output by the 6 target laser modules are combined to obtain a 15kHz combined laser pulse signal, i.e., a laser light source.

[0058] Based on the synchronous / asynchronous pulse laser control circuit, the following is to realize the beam combination modulation of 6-channel laser pulses through embedded software programming, and easily and stably realize the control of laser output according to the preset rotation mechanism.

[0059] In this beam combining scheme, the six laser beams are output in turn in the time domain, without beam superposition and superposition time difference, thus playing the role of pulse acceleration. Since the laser pulses of each channel work periodically, there is almost no waste heat accumulation in the working process of the laser and driver of each channel, so as to optimize the long-term stable operation of the laser.

[0060] Figure 7 The modulation timing diagram of the PWM pulse signal with two-way alternating output sequence provided in the embodiment of the present invention, for the PWM signal source, after frequency division according to the pulse control information, two-way alternating output sequence PWM pulse signals, namely PWM1 and PWM2, are obtained, wherein PWM1 and PWM2 are output synchronously, and are single pulse cross output.

[0061] Figure 8 The embodiment of the present invention provides a PWM pulse signal modulation timing diagram of two symmetrical pulse trains outputting alternately. For the PWM signal source, frequency division is performed to obtain two symmetrical pulse trains outputting alternately, namely PWM1 and PWM2, wherein PWM1 and PWM2 are output synchronously, and both are double pulse trains output crosswise.

[0062] As another feasible method, the pulse logic processing unit performs frequency division modulation on the PWM signal source with the number of channels corresponding to the laser channel selection instruction as the frequency division number, so as to generate laser pulse PWM with the same frequency for each laser; the number of pulses in one cycle of any two laser pulse PWMs is not equal, and the pulses of each laser pulse PWM do not overlap.

[0063] Fig. 9The embodiment of the present invention provides a PWM pulse signal modulation timing diagram of two asymmetric pulse trains outputting alternately, wherein frequency division obtains two asymmetric pulse signals outputting alternately, namely, PWM1 and PWM2, wherein PWM1 and PWM2 are output synchronously, and PWM1 is a single pulse output, and PWM2 is a double pulse output.

[0064] Therefore, by pulse programming and controlling the PWM signal source, the pulse sequence in the PWM signal source can be flexibly adjusted to obtain different PWM signals, that is, to realize frequency division modulation of the PWM signal source, alleviating the problem that the existing pulse form is fixed and pulse sequence programming cannot be realized, such as intercepting the pulse segment output according to the number of pulses or duration, thereby better realizing the different laser output requirements of users.

[0065] When each laser needs to output asynchronously, the high-frequency PWM signal source can be frequency-divided and modulated through pulse sequence programming to achieve the purpose of selecting pulses or intercepting arbitrary pulse segments or controlling arbitrary pulse timing, and respectively generate low-frequency PWM signals corresponding to each target laser module to be driven, and modulate the corresponding target laser module with this low-frequency PWM signal. Compared with the method of using a delay generator to perform relative timing control on multiple pulses in the prior art, the embodiment of the present invention independently controls each laser with an independent modulation signal, avoids the accumulation of delay errors, and thus improves the control accuracy of the laser.

[0066] Fig.10 The schematic diagram of the laser pulse modulation and driving circuit of channel 1 provided in the embodiment of the present invention is shown in FIG. Figure 5 On the basis of the above, the CH1 laser constant current driver in the box is added. The CH1 laser constant current driver includes operational amplifiers U6C, U6D, transistor Q1, laser diode LASER, resistors R17, R18, R19, R20, R21, R22, R23, R25, variable resistor W1, capacitors C15, C16, C17.

[0067] Taking channel 1 as an example, the signal processing process is explained. After the ARM microcontroller completes the amplitude editing and the FPGA completes the pulse editing, the amplitude signal DAC1 is buffered and strengthened through U6B, and input to the high-speed analog switch chip U7 together with the pulse modulation signal PWM_LASER1. The signal is buffered through R15. By embedding software programming on the ARM microcontroller and FPGA, editing applications in different application scenarios can be realized.

[0068] The multi-module synchronous or asynchronous pulse laser control circuit provided by the embodiment of the present invention performs synchronous / asynchronous control on the high-precision timing of multiple lasers, so that the pulse lasers output by multiple lasers are staggered in the time domain, and the pulse lasers output by each laser can be highly synchronized, ensuring that the peak power reaches the set index and improving the control accuracy. Multiple pulse lasers staggered can obtain a higher repetition frequency, and can output high peak power while achieving high average power.

[0069] An embodiment of the present invention also provides a laser device, which includes the above-mentioned multi-module synchronous or asynchronous pulse laser control circuit, multiple lasers and a synthetic output module; the multiple lasers are connected to the multiple laser driving circuits in a one-to-one correspondence; the synthetic output module is used to combine the laser beams output by the multiple lasers and output them.

[0070] The laser device provided in the embodiment of the present invention solves the same technical problem and achieves the same technical effect as the multi-module synchronous or asynchronous pulse laser control circuit provided in the above embodiment.

[0071] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

[0072] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used 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 "include", "comprise" 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, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements. The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-module synchronous or asynchronous pulse laser control circuit, characterized in that: include: A single chip microcomputer controller, a pulse logic processing unit, a pulse amplitude modulation circuit, a laser global switch circuit, a plurality of pulse control circuits and a plurality of laser driving circuits; The pulse control circuit corresponds to the laser driving circuit one by one; The single-chip microcomputer controller is used to receive human-computer interaction parameters, and generate a PWM signal source, pulse modulation parameters and control instructions according to the human-computer interaction parameters, wherein the pulse modulation parameters include pulse amplitude parameters and other modulation parameters, and the control instructions include synchronous / asynchronous output mode instructions, laser channel selection instructions and laser channel enable control instructions; And, sending the other modulation parameters, the synchronous / asynchronous output mode instruction, and the laser channel selection instruction to the pulse logic processing unit, sending the pulse amplitude parameter and the laser channel selection instruction to the pulse amplitude modulation circuit, and sending a laser channel enable control instruction to the laser global enable switch circuit; The pulse logic processing unit is used to generate the laser pulse PWM corresponding to each of the pulse control circuits according to the PWM signal source, the other modulation parameters, the synchronous / asynchronous output mode instruction, and the laser channel selection instruction; The pulse amplitude modulation circuit is used to generate a laser pulse amplitude modulation signal corresponding to each of the pulse control circuits according to the pulse amplitude parameter and the laser channel selection instruction; The pulse logic processing unit, the pulse amplitude modulation circuit and all the pulse control circuits are connected respectively; all the pulse control circuits are connected to the laser global switch circuit, and the laser global switch circuit is connected to all the laser driving circuits; The pulse control circuits are arranged in parallel, and the input ends of the pulse control circuits are connected to the pulse logic processing unit and the pulse amplitude modulation circuit, and the output ends are connected to the laser global switch circuit; each pulse control circuit is used to generate a laser pulse signal according to the corresponding laser pulse PWM and the corresponding laser pulse amplitude modulation signal; And, outputting the laser pulse signal to the corresponding laser driving circuit through the laser global switch circuit; The laser global enable switch circuit is used to control the corresponding laser channel switch according to the laser channel enable control instruction; Each of the laser driving circuits is used to drive the laser to operate according to the corresponding laser pulse signal.

2. The multi-module synchronous or asynchronous pulse laser control circuit according to claim 1, characterized in that: The laser global switch circuit includes a plurality of independent switch units; Each of the switch units corresponds one-to-one to the pulse control circuit and one-to-one to the laser driving circuit; After the laser channel enable control instruction is input into the switch unit, the switch unit controls whether the corresponding laser driving circuit is running in response to the laser channel enable control instruction.

3. The multi-module synchronous or asynchronous pulse laser control circuit according to claim 1, characterized in that: The other modulation parameters include: frequency, pulse width, number of pulses, and pulse configuration mode.

4. The multi-module synchronous or asynchronous pulse laser control circuit according to claim 1, characterized in that: The pulse control circuit includes a first operational amplifier unit, a switch chip and a second operational amplifier unit; The laser pulse amplitude modulation signal is input into the first operational amplifier unit, and the first operational amplifier unit outputs a signal to the switch chip; The switch chip also receives the laser pulse PWM corresponding to the same laser channel as the laser pulse amplitude modulation signal, and outputs a signal to the second operational amplifier unit.

5. The multi-module synchronous or asynchronous pulse laser control circuit according to claim 1, characterized in that: The pulse logic processing unit is used to perform frequency division modulation on the PWM signal source by taking the number of channels corresponding to the laser channel selection instruction as the frequency division number, so as to generate laser pulse PWM with the same frequency for each laser; The number of pulses in one cycle of each laser pulse PWM is equal, and the pulses of each laser pulse PWM do not overlap.

6. The multi-module synchronous or asynchronous pulse laser control circuit according to claim 5, characterized in that: The pulse phase difference between two adjacent laser pulse PWMs is one cycle.

7. The multi-module synchronous or asynchronous pulse laser control circuit according to claim 1, characterized in that: The pulse logic processing unit is used to perform frequency division modulation on the PWM signal source by taking the number of channels corresponding to the laser channel selection instruction as the frequency division number, so as to generate laser pulse PWM with the same frequency for each laser; The number of pulses in one cycle of any two laser pulse PWMs is not equal, and the pulses of each laser pulse PWM do not overlap.

8. The multi-module synchronous or asynchronous pulse laser control circuit according to claim 1, characterized in that: The single chip microcomputer controller and the pulse logic processing unit store embedded software, and the embedded software is used for changing / increasing or decreasing laser channels.

9. The multi-module synchronous or asynchronous pulse laser control circuit according to claim 1, characterized in that: Also included is a clock generator circuit; The clock generator circuit is used to generate a system reference clock signal source of a preset frequency, and to provide a clock signal to the single-chip microcomputer controller and the pulse logic processing unit.

10. A laser device, characterized in that: The laser device comprises a multi-module synchronous or asynchronous pulse laser control circuit as described in any one of claims 1 to 8 above, a plurality of lasers and a synthesis output module; The multiple lasers are connected to the multiple laser driving circuits in a one-to-one correspondence; the synthesis output module is used for combining the laser beams output by the multiple lasers and outputting them.

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