Fiber laser device

Abstract

The utility model relates to an optical fiber laser device, which belongs to the technical field of laser, and comprises an upper computer, a micro-control unit and a laser, and further comprises a plurality of driving modules electrically connected with the micro-control unit and used for amplifying electric signals output by the micro-control unit; the input ends of the constant-current modules are electrically connected with the driving module, and the output ends of the constant-current modules are electrically connected with the lasers. The device solves the problem that the same laser device can only adapt to a specific laser.

Description

Technical Field

[0001] The utility model relates to the technical field of lasers, in particular to a fiber laser device. Background Art

[0002] Fiber laser refers to a laser that uses rare earth-doped glass fiber as a gain medium. Fiber laser can be developed based on fiber amplifiers: under the action of pump light, high power density is easily formed in the optical fiber, causing a "particle number inversion" in the laser energy level of the laser working material. When a positive feedback loop is appropriately added (forming a resonant cavity), laser oscillation output can be formed.

[0003] Nowadays, most of the small semiconductor lasers on the market use dedicated integrated load switch chips. The voltage and current of the dedicated driver chip have a fixed operating range and poor substitutability. The constant current chip has a fixed current range and cannot match lasers from different manufacturers.

[0004] Utility Model / Utility Model Content

[0005] In view of this, it is necessary to provide a fiber laser device to solve the problem that the same laser device can only be adapted to a specific laser.

[0006] In order to solve the above problems, the utility model provides a fiber laser device, including a host computer, a micro control unit and a plurality of lasers, and the device also includes:

[0007] A plurality of driving modules, electrically connected to the micro control unit, and used to amplify the electrical signal output by the micro control unit;

[0008] A plurality of constant current modules, whose input ends are electrically connected to the driving module and whose output ends are electrically connected to the laser, are used to provide electrical energy to the laser and adjust the current.

[0009] In a possible implementation, the driving module includes: a first N-type MOS transistor, a second N-type MOS transistor, a third N-type MOS transistor, a fourth N-type MOS transistor, a fifth N-type MOS transistor, a sixth N-type MOS transistor, a seventh N-type MOS transistor, and an eighth N-type MOS transistor;

[0010] Wherein, the gates of the first to eighth N-type MOS transistors are all electrically connected to the micro control unit;

[0011] The drain of the first N-type MOS transistor is electrically connected to the drains of the second to fourth N-type MOS transistors;

[0012] The sources of the fifth to eighth N-type MOS tubes are all electrically connected to the output end of the driving module;

[0013] The source of the first N-type MOS transistor is electrically connected to the drain of the fifth N-type MOS transistor;

[0014] The source of the second N-type MOS transistor is electrically connected to the drain of the sixth N-type MOS transistor;

[0015] The source of the third N-type MOS transistor is electrically connected to the drain of the seventh N-type MOS transistor;

[0016] The source of the fourth N-type MOS transistor is electrically connected to the drain of the eighth N-type MOS transistor.

[0017] In a possible implementation manner, the first N-type MOS transistor and the eighth N-type MOS transistor are both electrically connected to a TO package device.

[0018] In a possible implementation, the first N-type MOS transistor and the eighth N-type MOS transistor are both electrically connected to a TO package device, including:

[0019] The source of the first N-type MOS transistor and the drain of the fifth N-type MOS transistor are electrically connected to the first TO package device;

[0020] The source of the second N-type MOS transistor and the drain of the sixth N-type MOS transistor are electrically connected to the second TO package device;

[0021] The source of the third N-type MOS tube and the drain of the seventh N-type MOS tube are electrically connected to the third TO package device;

[0022] The source of the fourth N-type MOS transistor and the drain of the seventh N-type MOS transistor are electrically connected to the fourth TO package device.

[0023] In a possible implementation, the constant current module includes: a constant current proportional adjustment circuit.

[0024] In a possible implementation, the constant current proportional regulation circuit includes: a first operational amplifier, a first resistor, a second resistor, and a third resistor;

[0025] The non-inverting input terminal of the first operational amplifier is electrically connected to the micro control unit;

[0026] The first end of the first resistor receives the reverse input voltage transmitted externally, and the second end is electrically connected to the non-inverting input end;

[0027] A first end of the second resistor is electrically connected to the inverting input terminal of the first operational amplifier, and a second end is grounded;

[0028] A first end of the third resistor is electrically connected to the first inverting input end, and a second end of the third resistor is electrically connected to the output end of the first operational amplifier.

[0029] In a possible implementation, the constant current module further includes: a constant current control integral operational amplifier circuit.

[0030] In a possible implementation, the constant current controlled integral operational amplifier circuit includes a second operational amplifier, a fourth resistor, a first diode, a first capacitor and a ninth N-type MOS tube;

[0031] The non-inverting input terminal of the second operational amplifier is electrically connected to the output terminal of the constant current proportional regulation circuit, the inverting input terminal is electrically connected to the first terminal of the first capacitor and the source of the ninth N-type MOS transistor, and the output terminal is connected to the second terminal of the first capacitor;

[0032] The second end of the first capacitor is also electrically connected to the cathode of the first diode;

[0033] A first end of the fourth resistor is electrically connected to the output end of the second operational amplifier and the cathode of the first diode, and a second end of the fourth resistor is electrically connected to the drain of the ninth N-type MOS transistor;

[0034] The drain of the ninth N-type MOS tube is electrically connected to the output end of the driving module.

[0035] In a possible implementation, the constant current controlled integral operational amplifier circuit further includes:

[0036] a fifth resistor and a second diode;

[0037] A first end of the fifth resistor is electrically connected to the inverting input terminal of the second operational amplifier, and a second end of the fifth resistor is electrically connected to the anode of the second diode;

[0038] A cathode of the second diode is electrically connected to the second end of the first capacitor.

[0039] In a possible implementation, the driving module further includes: a sixth resistor;

[0040] The first end of the sixth resistor is electrically connected to the inverting input end of the second operational amplifier and the source of the ninth N-type MOS transistor, and the second end is grounded.

[0041] The beneficial effect of the utility model is as follows: the utility model provides a fiber laser device, including multiple independent lines, each line is provided with a driving module and a constant current module, and 2 or more pulse driving modules are realized by combining software and hardware circuits. This circuit has multiple channels working at the same time, and the pulse constant current size is adjustable, which can adapt to the settings of different laser manufacturers without changing the circuit scheme structure, using less hardware resources while achieving the purpose of arbitrary constant current regulation of the current, and has the characteristics of easy realization, low cost, high practicality, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A schematic structural diagram of an embodiment of a fiber laser device provided by the utility model;

[0043] Figure 2 for Figure 1 A schematic structural diagram of an embodiment of a middle drive module;

[0044] Figure 3 for Figure 1 A structural diagram of an embodiment of a constant current module. DETAILED DESCRIPTION

[0045] 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.

[0046] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0047] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0048] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0049] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0050] like Figure 1 As shown, a specific embodiment of the utility model discloses a fiber laser device 10, including a host computer 110, a micro control unit 120 and a plurality of lasers 130, and the device 10 also includes:

[0051] A plurality of driving modules 140 are electrically connected to the micro control unit 120 and are used to amplify the electrical signal output by the micro control unit 120;

[0052] A plurality of constant current modules 150 have input ends electrically connected to the driving module 140 and output ends electrically connected to the laser 130 , and are used to provide electrical energy to the laser 130 and adjust the current.

[0053] It is understandable that the host computer 110 and the micro control unit 120 may be connected by communication. When working, the host computer 110 and the micro control unit 120 communicate in real time, and the host computer 110 is mainly responsible for editing the constant current data size and displaying the constant current data, etc. In addition, a digital-to-analog / analog-to-digital converter is provided in the micro control unit 120 to realize the acquisition and control of the digital-to-analog converter / analog-to-digital converter signal.

[0054] During implementation, the host computer 110 first needs to set parameters, and then the host computer 110 communicates with the micro control unit 120 , so that the micro control unit 120 can independently send out more than two driving signals to control the driving module 140 .

[0055] Compared with the prior art, the utility model provides a fiber laser device, including multiple independent lines, each line is provided with a driving module and a constant current module, and 2 or more pulse driving modules are realized by combining software and hardware circuits. This circuit has multiple channels working simultaneously, and the pulse constant current size is adjustable. It can adapt to the settings of different laser manufacturers without changing the circuit scheme structure. It uses less hardware resources and can achieve the purpose of arbitrary constant current regulation. It has the characteristics of easy implementation, low cost, and high practicality.

[0056] like Figure 2As shown, in a possible implementation, the driving module 140 includes: a first N-type MOS transistor 1401, a second N-type MOS transistor 1402, a third N-type MOS transistor 1403, a fourth N-type MOS transistor 1404, a fifth N-type MOS transistor 1405, a sixth N-type MOS transistor 1406, a seventh N-type MOS transistor 1407 and an eighth N-type MOS transistor 1408;

[0057] The gates of the N-type MOS tubes 1401-1408 are all electrically connected to the micro control unit 120;

[0058] The drain of the first N-type MOS transistor 1401 is electrically connected to the drains of the N-type MOS transistors 1402 to 1404;

[0059] The sources of the N-type MOS tubes 1405-1408 are electrically connected to the output end of the driving module 140;

[0060] The source of the first N-type MOS transistor 1401 is electrically connected to the drain of the fifth N-type MOS transistor 1405;

[0061] The source of the second N-type MOS transistor 1402 is electrically connected to the drain of the sixth N-type MOS transistor 1406;

[0062] The source of the third N-type MOS transistor 1403 is electrically connected to the drain of the seventh N-type MOS transistor 1407;

[0063] The source of the fourth N-type MOS transistor 1404 is electrically connected to the drain of the eighth N-type MOS transistor 1408 .

[0064] It can be understood that, in this embodiment, the driving module 140 includes an upper bridge arm MOS and a lower bridge arm MOS, wherein the upper bridge arm MOS includes N-type MOS tubes 1401-1404, and the lower bridge arm MOS includes N-type MOS tubes 1405-1408. The driving circuit is designed using MOS tubes, which has the advantages of fast startup, no high-frequency oscillation on the rising edge, and high stability.

[0065] During implementation, each MOS driver can be individually controlled by the micro control unit 120 to control the on and off of the MOS tube.

[0066] In a possible implementation, the N-type MOS transistors 1401 - 1408 are all electrically connected to the TO package device.

[0067] In a possible implementation, the source of the first N-type MOS transistor 1401 and the drain of the fifth N-type MOS transistor 1405 are electrically connected to the first TO package device 1409;

[0068] The source of the second N-type MOS transistor 1402 and the drain of the sixth N-type MOS transistor 1406 are electrically connected to the second TO package device 1410;

[0069] The source of the third N-type MOS transistor 1403 and the drain of the seventh N-type MOS transistor 1407 are electrically connected to the third TO package device 1411;

[0070] The source of the fourth N-type MOS transistor 1404 and the drain of the seventh N-type MOS transistor 1407 are electrically connected to the fourth TO package device 1412 .

[0071] like Figure 3 As shown, in a possible implementation, the constant current module 150 includes: a constant current current proportional regulation circuit and a constant current control integral operational amplifier circuit.

[0072] In a possible implementation, the constant current proportional regulation circuit includes: a first operational amplifier 1501, a first resistor 1502, a second resistor 1503 and a third resistor 1504;

[0073] The non-inverting input terminal of the first operational amplifier 1501 is electrically connected to the micro control unit 120;

[0074] The first end of the first resistor 1502 receives the externally transmitted reverse input voltage -VCC, and the second end is electrically connected to the non-inverting input end;

[0075] A first end of the second resistor 1503 is electrically connected to the inverting input terminal of the first operational amplifier 1501, and a second end thereof is grounded;

[0076] A first end of the third resistor 1504 is electrically connected to the inverting input terminal of the first operational amplifier 1501 , and a second end of the third resistor 1504 is electrically connected to the output terminal of the first operational amplifier 1501 .

[0077] It should be noted that the analog output of the digital-to-analog converter is set The reverse input voltage -VCC is superimposed and input to the positive input terminal of the first operational amplifier 1501. The first resistor 1502, the second resistor 1503 and the first operational amplifier 1501 constitute a forward operational amplifier. Then, the output of the output terminal of the first operational amplifier 1501 is:

[0078] (1)

[0079] In formula (1), U 1_out represents the output of the output terminal of the first operational amplifier 1501, U 1+ represents the input of the positive input terminal of the first operational amplifier 1501, R1 represents the resistance value of the first resistor 1502, R 2 represents the resistance value of the second resistor 1503 .

[0080] In a possible implementation, the constant current control integration operational amplifier circuit includes: a second operational amplifier 1505, a fourth resistor 1506, a first diode 1507, a first capacitor 1508 and a ninth N-type MOS tube 1509;

[0081] The non-inverting input terminal of the second operational amplifier 1505 is electrically connected to the output terminal of the constant current proportional regulation circuit, the inverting input terminal is electrically connected to the first terminal of the first capacitor 1508, the first terminal of the fourth resistor 1506 and the source of the ninth N-type MOS transistor 1509, and the output terminal is connected to the second terminal of the first capacitor 1508;

[0082] The second end of the first capacitor 1508 is also electrically connected to the cathode of the first diode 1507;

[0083] A first end of the fourth resistor 1506 is electrically connected to the output end of the second operational amplifier 1505 and the anode of the first diode 1507, and a second end of the fourth resistor 1506 is electrically connected to the drain of the ninth N-type MOS transistor 1509;

[0084] The drain of the ninth N-type MOS transistor 1509 is electrically connected to the output end of the driving module 140 .

[0085] In a possible implementation, the constant current control integral operational amplifier circuit further includes:

[0086] a fifth resistor 1510 and a second diode 1511;

[0087] A first end of the fifth resistor 1510 is electrically connected to the inverting input terminal of the second operational amplifier 1505, and a second end thereof is electrically connected to the anode of the second diode 1511;

[0088] A cathode of the second diode 1511 is electrically connected to the second end of the first capacitor 1508 .

[0089] It can be understood that, in this embodiment, the second operational amplifier 1505, the fourth resistor 1506, the first diode 1507, the first capacitor 1508 and the ninth N-type MOS tube 1509 constitute a constant current control integrating operational amplifier. The forward input voltage of the second operational amplifier 1505 is U 1_out , which is combined with the reverse input voltage (U _R5 ) to compare the integral output (U 2_out ), by controlling the gate voltage of the ninth N-type MOS tube 1509, the conduction degree thereof is controlled, thereby controlling the drain current of the ninth N-type MOS tube 1509 and the laser current, thereby achieving the purpose of constant current.

[0090] It should be noted that, in this embodiment, the fifth resistor 1510 and the second diode 1511 constitute an integral control acceleration circuit. When the constant current is started, the ninth N-type MOS tube 1509 is in the cut-off state. Since the output of the front-end integral amplifier is in the negative full bias voltage (-VCC), the driving voltage of 1511 needs to rise from -VCC to the positive driving voltage when the constant current is started. The rise time is long and the current stability is poor. When the circuit has the fifth resistor 1510 and the second diode 1511, the driving voltage of 1511 is clamped at U at the constant current start time. _R5 After constant current startup, the driving voltage changes from U _R5 The drive voltage rises to the constant current required, accelerating the process of constant current stability.

[0091] In a possible implementation, the constant current module 150 further includes: a sixth resistor 1512;

[0092] A first end of the sixth resistor 1512 is electrically connected to the inverting input terminal of the second operational amplifier 1505 and the source of the ninth N-type MOS transistor 1509 , and a second end thereof is grounded.

[0093] It should be noted that the sixth resistor 1512 is used to sample the constant current, and the sampling current calculation formula is as follows:

[0094] (2)

[0095] In formula (2), I _out represents the sampling current, R 6 represents the resistance value of the sixth resistor 1512 .

[0096] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A fiber laser device, comprising a host computer, a micro control unit and a laser, characterized in that: The device also includes: A plurality of driving modules, electrically connected to the micro control unit, and used to amplify the electrical signal output by the micro control unit; A plurality of constant current modules, whose input ends are electrically connected to the driving module and whose output ends are electrically connected to the laser, are used to provide electrical energy to the laser and adjust the current.

2. The fiber laser device according to claim 1, characterized in that: The driving module includes: a first N-type MOS transistor, a second N-type MOS transistor, a third N-type MOS transistor, a fourth N-type MOS transistor, a fifth N-type MOS transistor, a sixth N-type MOS transistor, a seventh N-type MOS transistor and an eighth N-type MOS transistor; Wherein, the gates of the first to eighth N-type MOS transistors are all electrically connected to the micro control unit; The drain of the first N-type MOS transistor is electrically connected to the drains of the second to fourth N-type MOS transistors; The sources of the fifth to eighth N-type MOS tubes are all electrically connected to the output end of the driving module; The source of the first N-type MOS transistor is electrically connected to the drain of the fifth N-type MOS transistor; The source of the second N-type MOS transistor is electrically connected to the drain of the sixth N-type MOS transistor; The source of the third N-type MOS transistor is electrically connected to the drain of the seventh N-type MOS transistor; The source of the fourth N-type MOS transistor is electrically connected to the drain of the eighth N-type MOS transistor.

3. The fiber laser device according to claim 2, characterized in that: The first N-type MOS transistor and the eighth N-type MOS transistor are both electrically connected to the TO package device.

4. The fiber laser device according to claim 3, characterized in that: The first N-type MOS transistor and the eighth N-type MOS transistor are both electrically connected to the TO package device, including: The source of the first N-type MOS transistor and the drain of the fifth N-type MOS transistor are electrically connected to the first TO package device; The source of the second N-type MOS transistor and the drain of the sixth N-type MOS transistor are electrically connected to the second TO package device; The source of the third N-type MOS tube and the drain of the seventh N-type MOS tube are electrically connected to the third TO package device; The source of the fourth N-type MOS transistor and the drain of the seventh N-type MOS transistor are electrically connected to the fourth TO package device.

5. The fiber laser device according to claim 1, characterized in that: The constant current module includes: a constant current proportional regulation circuit.

6. The fiber laser device according to claim 5, characterized in that: The constant current proportional regulation circuit comprises: a first operational amplifier, a first resistor, a second resistor and a third resistor; The non-inverting input terminal of the first operational amplifier is electrically connected to the micro control unit; The first end of the first resistor receives the reverse input voltage transmitted externally, and the second end is electrically connected to the non-inverting input end; A first end of the second resistor is electrically connected to the inverting input terminal of the first operational amplifier, and a second end is grounded; A first end of the third resistor is electrically connected to the inverting input terminal of the first operational amplifier, and a second end of the third resistor is electrically connected to the output terminal of the first operational amplifier.

7. The fiber laser device according to claim 5, characterized in that: The constant current module also includes: a constant current control integral operational amplifier circuit.

8. The fiber laser device according to claim 7, characterized in that: The constant current control integral operational amplifier circuit comprises: a second operational amplifier, a fourth resistor, a first diode, a first capacitor and a ninth N-type MOS tube; The non-inverting input terminal of the second operational amplifier is electrically connected to the output terminal of the constant current proportional regulation circuit, the inverting input terminal is electrically connected to the first terminal of the first capacitor and the source of the ninth N-type MOS transistor, and the output terminal is connected to the second terminal of the first capacitor; The second end of the first capacitor is also electrically connected to the cathode of the first diode; A first end of the fourth resistor is electrically connected to the output end of the second operational amplifier and the cathode of the first diode, and a second end of the fourth resistor is electrically connected to the drain of the ninth N-type MOS transistor; The drain of the ninth N-type MOS tube is electrically connected to the output end of the driving module.

9. The fiber laser device according to claim 8, characterized in that: The constant current control integral operational amplifier circuit further includes: a fifth resistor and a second diode; A first end of the fifth resistor is electrically connected to the inverting input terminal of the second operational amplifier, and a second end of the fifth resistor is electrically connected to the anode of the second diode; A cathode of the second diode is electrically connected to the second end of the first capacitor.

10. The fiber laser device according to claim 9, characterized in that: The driving module further includes: a sixth resistor; The first end of the sixth resistor is electrically connected to the inverting input end of the second operational amplifier and the source of the ninth N-type MOS transistor, and the second end is grounded.

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