Miniature high-precision butterfly seed light laser control system

Abstract

The invention discloses a miniature high-precision butterfly-shaped seed light laser control system, and the system comprises a temperature control unit which is used for driving a TEC module in a butterfly-shaped seed light laser to carry out the refrigeration or heating according to the internal temperature of the butterfly-shaped seed light laser, and enabling the internal temperature of the butterfly-shaped seed light laser to reach a set temperature; the driving unit is used for generating current for driving the butterfly-shaped seed light laser, so that the butterfly-shaped seed light laser outputs fixed or linear power; the temperature control unit comprises a temperature adjusting circuit and a TEC driving circuit. The driving unit comprises a power adjusting circuit and a constant current driving circuit.

Description

Technical Field

[0001] The present invention belongs to the technical field of laser control, and in particular relates to a miniature high-precision butterfly seed light laser control system. Background Art

[0002] In the design of laser control systems, temperature control and drive current control are the core parts. The reason is that excessively high operating temperature will cause a significant decline in the performance of the laser and even damage the laser; the drive current will also have a significant impact on the working performance of the laser.

[0003] With the development of seed lasers, the current stability of the drive circuits in existing laser control systems has failed to meet the requirements of new seed lasers. With the development of ultrafast laser technology, existing laser control systems are too large to meet the needs of miniaturization. Summary of the Invention

[0004] Purpose of the invention: To solve the problem that the current stability of existing laser control systems cannot meet the requirements of new seed light lasers, and to solve the disadvantage of the existing laser control systems being too large, the present invention proposes a miniature high-precision butterfly seed light laser control system. By adopting a control scheme that uses a high-precision amplifier chip to drive the NMOS tube, a drive circuit with extremely high current stability is obtained. By adopting a highly integrated design, the size of the seed light laser control system is greatly reduced.

[0005] Technical solution: A miniature high-precision butterfly seed laser control system, including: A temperature control unit is used to drive the TEC module inside the butterfly seed light laser to cool or heat the butterfly seed light laser according to the internal temperature of the butterfly seed light laser, so that the internal temperature of the butterfly seed light laser reaches the set temperature; Wherein, the temperature control unit includes: a temperature adjustment circuit and a TEC driving circuit; The temperature regulating circuit includes: a REF2000 chip and a first potentiometer; one path of the REF2000 chip is used to convert the internal temperature of the butterfly seed light laser into a corresponding voltage signal V th The other channel of the REF2000 chip is used to convert the set temperature into a corresponding voltage signal V set ;Change the set temperature by changing the resistance value of the first potentiometer; The TEC driving circuit includes a PD controller, which is used to convert the input voltage signal V th And the voltage signal V set It is converted into a voltage signal that drives the TEC module inside the butterfly seed light laser to control the cooling or heating of the TEC module.

[0006] Furthermore, the temperature regulating circuit further includes a protective resistor, one end of which is connected to the other output end of the REF2000 chip, and the other end of which is grounded via a first potentiometer.

[0007] Furthermore, the PD controller includes a first OPA569 chip, a second OPA569 chip, a second resistor, a fourth resistor, a fifth resistor and a first capacitor; The positive input terminal of the first OPA569 chip is connected to an output terminal of the REF2000 chip for receiving a voltage signal V th , the negative input terminal of the first OPA569 chip is connected to the output terminal of the first OPA569 chip; The positive input terminal of the second OPA569 chip is connected to the other output terminal of the REF2000 chip to receive the voltage signal V set , the negative input terminal of the second OPA569 chip is connected to the negative input terminal of the first OPA569 chip through a fourth resistor; and the negative input terminal of the second OPA569 chip is connected to the output terminal of the second OPA569 chip through a second resistor; The fifth resistor is connected in series with the first capacitor, and the free end of the fifth resistor is connected to the negative input end of the second OPA569 chip, and the free end of the first capacitor is connected to the output end of the second OPA569 chip.

[0008] Furthermore, the PD controller is used to convert the input voltage signal V th And the voltage signal V set Converted into a voltage signal to drive the TEC module inside the butterfly seed laser to control the cooling or heating of the TEC module, including: The thermistor inside the butterfly seed laser is an NTC thermistor; The output of the PD controller is expressed as: ; ; Where, 、 Respectively represent the voltage output to the TEC- pin and TEC+ pin of the TEC module, is the resistance of the second resistor, is the resistance value of the fourth resistor; When the internal temperature of the butterfly seed laser is higher than the set temperature, V set <V th , , control the TEC module cooling; When the internal temperature of the butterfly seed laser is lower than the set temperature, Vset >V th , , control the TEC module to heat.

[0009] Furthermore, the invention further comprises: a driving unit for generating a current to drive the butterfly seed light laser so that the butterfly seed light laser outputs a fixed or linear power; The driving unit includes a power regulation circuit; The power regulation circuit includes: an ADR4525 chip, a voltage divider resistor, and at least two-position dip switches; the output end of the ADR4525 chip is connected to the input end of one of the at least two-position dip switches via a second potentiometer, and the output end of the ADR4525 chip is connected to the input end of the other circuit of the at least two-position dip switches via a fixed resistor; the output ends of all circuits of the at least two-position dip switches are grounded via the voltage divider resistor; By adjusting the second potentiometer, the butterfly seed light laser outputs linear power; The butterfly seed light laser outputs a fixed power through a fixed value resistor.

[0010] Furthermore, the power regulation circuit also includes a first current limiting resistor, which is connected in series with a second potentiometer, and the free end of the current limiting resistor is connected to the output end of the ADR4525 chip, and the free end of the second potentiometer is connected to the input end of one channel of at least a 2-bit dip switch.

[0011] Furthermore, the driving unit further includes a constant current driving circuit; the constant current driving circuit includes an operational amplifier, an NMOS tube, a power inductor and a constant voltage chip; The positive input terminal of the operational amplifier is connected to the output terminals of all paths of the at least 2-bit DIP switch, the negative input terminal of the operational amplifier is connected to the output terminal of the operational amplifier through a PD link, and the negative input terminal of the operational amplifier is grounded through a twenty-first resistor and a twenty-second resistor connected in series; the output terminal of the operational amplifier is connected to the gate of the NMOS transistor through a second current-limiting resistor to provide a gate voltage for the NMOS transistor; The source of the NMOS tube is grounded via a twenty-second resistor; When the NMOS tube is turned on, a driving current is generated at the drain of the NMOS tube and provided to the butterfly seed light laser. The driving current flows through the power inductor and reaches the LD- terminal. The constant voltage chip is connected to the LD+ terminal to keep the voltage of the LD+ terminal constant; The LD+ end and the LD- end are connected to a butterfly seed light laser.

[0012] Furthermore, a bidirectional diode is provided between the LD+ terminal and the LD- terminal.

[0013] Furthermore, the PD link is composed of a twentieth resistor and a second capacitor connected in parallel.

[0014] Furthermore, it also includes: a power supply unit; the power supply unit includes an EMI filter; the EMI filter is used to filter the external power supply and then supply power to the temperature control unit.

[0015] Beneficial effects: Compared with the prior art, the present invention has the following advantages: (1) To address the problem that the current stability of existing laser control systems cannot meet the requirements of new seed light lasers, the present invention designs a constant current source composed of a high-precision amplifier chip, an NMOS tube and a power inductor, which improves the driving current stability to 6‰; (2) In view of the problem that the driving current of the existing laser control system will jump in a very short time when it is turned on and off, and if the power supply is turned on and off multiple times in a short time, the service life of the laser will be shortened, the present invention uses power inductors to slow down the fluctuation speed of the current in a short time, which is conducive to extending the service life of the laser; (3) To address the problem of insufficient temperature control accuracy in existing laser control systems, the present invention uses two amplifier chips to build a PD controller, which controls the TEC module integrated inside the laser through the output voltage difference, thereby controlling the temperature of the laser. The measured temperature stability is 15.4ppm, and the maximum temperature fluctuation within 3 hours is only 0.000385728℃; (4) To address the problem of the existing laser control system being too large, the present invention optimizes the spatial arrangement of the system and uses a dual-channel high-precision amplifier MAX44248, which greatly reduces the size of the laser control system. The finished product size of the present invention is only 60mm×60mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the structural diagram of the temperature control unit; Figure 2 This is the circuit diagram of the temperature control unit; Figure 3 is a circuit diagram of a driving circuit; Figure 4 This is the circuit diagram of the EMI filter; Figure 5 This is the circuit diagram of the monitoring unit; Figure 6 This is the temperature curve of the butterfly seed laser for 3 hours; Figure 7 This is the 4-hour output optical power curve of the butterfly seed laser; Figure 8 is an output curve diagram of the power regulation circuit in the drive unit; Figure 9It is the output curve diagram of the constant current driving circuit in the driving unit. DETAILED DESCRIPTION

[0017] The technical solution of the present invention will now be further described with reference to the accompanying drawings and embodiments.

[0018] Example 1: This example proposes a miniature high-precision butterfly seed laser control system, which primarily includes a temperature control unit. The temperature control unit is primarily used to drive the TEC module inside the butterfly seed laser to cool or heat the butterfly seed laser according to the internal temperature of the butterfly seed laser, so that the internal temperature of the butterfly seed laser reaches a set temperature.

[0019] Now combined Figure 1 and Figure 2 , the temperature control unit proposed in this embodiment is further explained.

[0020] The butterfly seed laser has an NTC thermistor and a TEC module integrated inside. The NTC thermistor is a negative temperature coefficient thermistor used to transmit the current temperature of the butterfly seed laser, and the TEC module is used to heat or cool the butterfly seed laser.

[0021] Therefore, if Figure 1 As shown, the temperature control unit of this embodiment mainly includes: a high-precision bridge circuit and a PD controller. Relying on the NTC thermistor integrated in the butterfly seed laser to transmit the current internal temperature of the butterfly seed laser, the high-precision bridge circuit converts the set temperature and the current internal temperature of the butterfly seed laser into corresponding voltages, and inputs the two voltages into the PD controller. The PD controller transmits the voltage difference between the two to the TEC module integrated in the butterfly seed laser, driving the TEC module to cool or heat, thereby bringing the internal temperature of the butterfly seed laser to the set temperature.

[0022] like Figure 2 As shown, the high-precision bridge circuit of this embodiment includes a REF2000 chip U1, a first potentiometer Rj1, and a first resistor R1; the REF2000 chip U1 outputs two voltage signals, one of which is the internal temperature of the butterfly seed laser transmitted by the NTC thermistor integrated inside the butterfly seed laser, converted into a corresponding voltage signal V th ; The other voltage signal is used to convert the set temperature into the corresponding voltage signal V setIn this embodiment, the temperature setting is achieved by adjusting the first potentiometer Rj1. Specifically, one end of the first potentiometer Rj1 is grounded, and the other end of the first potentiometer Rj1 is connected to the REF2000 chip U1 through the first resistor R1. The first resistor R1 is a protective resistor to prevent the temperature of the butterfly seed laser from being set too high, thereby damaging the butterfly seed laser. The REF2000 chip U1 circuit generates a voltage signal V th And the voltage signal V set Input to the PD controller.

[0023] like Figure 2 As shown, the PD controller of this embodiment includes a first OPA569 chip U2, a second OPA569 chip U3, a second resistor R2, a fourth resistor R4, a fifth resistor R5 and a first capacitor C1; the positive input terminal of the first OPA569 chip U2 is connected to an output terminal of the REF2000 chip U1 for receiving a voltage signal V th The negative input terminal of the first OPA569 chip U2 is connected to the output terminal of the first OPA569 chip U2. The positive input terminal of the second OPA569 chip U3 is connected to the other output terminal of the REF2000 chip U1 for receiving the voltage signal V set The negative input terminal of the second OPA569 chip U3 is connected to the negative input terminal of the first OPA569 chip U2 through the fourth resistor R4; and the negative input terminal of the second OPA569 chip U3 is connected to the output terminal of the second OPA569 chip U3 through the second resistor R2; the fifth resistor R5 is connected in series with the first capacitor C1, and the free end of the fifth resistor R5 is connected to the negative input terminal of the second OPA569 chip U3, and the free end of the first capacitor C1 is connected to the output terminal of the second OPA569 chip U3. In this embodiment, the free end of the fifth resistor R5 refers to the end that is not connected in series with the first capacitor C1. Similarly, the free end of the first capacitor C1 refers to the end that is not connected in series with the fifth resistor R5. The output terminal of the first OPA569 chip U2 outputs a voltage signal The output terminal of the second OPA569 chip U3 outputs a voltage signal In the PD controller, the fourth resistor R4, the fifth resistor R5, the first capacitor C1 and the second resistor R2 form a proportional differential control link, which ultimately converts the input voltage signal V th And the voltage signal V set Converted into a voltage signal to drive the TEC module inside the butterfly seed laser ( 、 ), controls the cooling or heating of the TEC module, so that the overall temperature of the butterfly seed light laser is maintained in a suitable temperature range.

[0024] Under the control of the PD controller, the TEC module has three main working states: pause, cooling, and heating. Taking the set temperature of 25℃ as an example, when the internal temperature of the butterfly seed laser is 25℃, the thermistor R th The resistance is 10KΩ, and the high-precision bridge reaches a balanced state, that is: ; Where V represents the voltage unit volt.

[0025] The output of the PD controller is expressed as: ; ; Where, is the resistance of the second resistor, is the resistance of the fourth resistor.

[0026] From formula (2) and formula (3), we can see that , at this time the TEC module stops working.

[0027] When the internal temperature of the butterfly seed laser is higher than the set temperature, that is, greater than 25°C, V set <V th , , control the TEC module cooling; When the internal temperature of the butterfly seed laser is lower than the set temperature, that is, less than 25°C, V set >V th , , control the TEC module to heat.

[0028] Example 2: This example proposes a micro high-precision butterfly seed laser control system, which mainly includes: a driving circuit. The driving circuit is mainly used to generate a current to drive the butterfly seed laser, so that the butterfly seed laser outputs a fixed or linear power. The driving circuit mainly includes: a power regulation circuit and a constant current driving circuit. Figure 3 , the driving circuit proposed in this embodiment is further explained.

[0029] Specifically, the power regulation circuit of this embodiment includes: ADR4525 chip U4, 12-bit dip switch SW1, second potentiometer Rj2, sixth resistor R6, seventh resistor R7, eighth resistor R8, ninth resistor R9, tenth resistor R 10 , the eleventh resistor R 11 , the twelfth resistor R 12 , the thirteenth resistor R 13 , the fourteenth resistor R 14 , the fifteenth resistor R 15 , the sixteenth resistor R16 , Seventeenth resistor R 17 and the eighteenth resistor R 18 Among them, the sixth resistor R6 is used as a current limiting resistor to prevent excessive current from damaging the butterfly seed laser, and the eighteenth resistor R 18 As a voltage divider resistor. The sixth resistor R6 is connected in series with the second potentiometer Rj2, and then connected with the seventh resistor R7 to the seventeenth resistor R 17 In parallel, each branch is connected to the output of the ADR4525 chip U4 and one switch of the 12-bit dip switch SW1.

[0030] The core of the power regulation circuit in this embodiment is the ADR4525 chip U4, which outputs a high-precision 2.5V voltage. This embodiment utilizes the principle of voltage division to output 12 voltage signals SETI1 with varying values. The output power of the butterfly seed laser is adjusted by adjusting the second potentiometer Rj2. The remaining channels of the 12-bit DIP switch SW1 are fixed-value resistors, enabling the butterfly seed laser to output a fixed power. The use of high-precision resistors and potentiometers in parallel allows the butterfly seed laser to achieve both linear power output and high-precision, highly stable power output through high-precision resistors.

[0031] Specifically, the constant current driving circuit of this embodiment includes: a first MAX44248 operational amplifier U5, an NMOS tube Q1, a power inductor L1, a TPS7A4501DCQR constant voltage chip U6, a nineteenth resistor R 19 , the 20th resistor R 20 21st resistor R 21 22nd resistor R 22 and the second capacitor C2; the positive input terminal of the first MAX44248 op amp U5 is connected to the output terminal of the 12-bit dip switch SW1 to receive the voltage signal SETI1; the negative input terminal of the first MAX44248 op amp U5 is connected to the output terminal of the first MAX44248 op amp U5 through the PD link, and the negative input terminal of the first MAX44248a op amp U5 is connected to the output terminal of the first MAX44248 op amp U5 through the series twenty-one resistor R 21 and the twenty-second resistor R 22 The output of the first MAX44248 operational amplifier U5 is connected to ground through the nineteenth resistor R 19 Connected to the gate of NMOS tube Q1, providing gate voltage for NMOS tube Q1; wherein, the PD link is connected by the 20th resistor R 20 and the second capacitor C2, wherein the nineteenth resistor R 19 As a current limiting resistor.

[0032] The source of the NMOS tube Q1 is connected to the 22nd resistor R 22Grounded; when the NMOS tube Q1 is turned on, a driving current provided to the butterfly seed light laser is generated at the drain of the NMOS tube Q1, and the driving current flows through the power inductor L1 to reach the LD- terminal; the power inductor L1 plays the role of slowing down the current change, thereby achieving slow start and protecting the butterfly seed light laser.

[0033] The output of the TPS7A4501DCQR constant voltage chip U6 is connected to the LD+ terminal to maintain the voltage at 4.85V. This ensures that the butterfly seed laser always operates under appropriate voltage conditions and reduces output fluctuations. This embodiment also provides a bidirectional diode D1 between the LD+ and LD- terminals to prevent overvoltage damage to the butterfly seed laser.

[0034] The LD+ and LD- terminals of the driver circuit are connected to the butterfly seed laser. In the driver circuit, the first MAX44248 op amp U5, NMOS transistor Q1, and power inductor L1 form a constant current source to provide appropriate drive current for the butterfly seed laser.

[0035] In order to monitor the voltage of LD-terminal in real time, a voltage follower can be built through the second MAX44248 op amp U7. Specifically, it includes the second MAX44248 op amp U7, the twenty-third resistor R 23 and the second fourth resistor R 24 ; The twenty-third resistor R 23 One end of the twenty-third resistor R is connected to the positive input terminal of the second MAX44248 operational amplifier U7. 23 The other end passes through the 22nd resistor R 22 Grounded, the negative input of the second MAX44248 op amp U7 is connected to the ground through the second resistor R 24 Connected to the output end of the second MAX44248 operational amplifier U7, the output end of the second MAX44248 operational amplifier U7 outputs a voltage signal VTestLD-, thereby realizing real-time monitoring of the voltage condition of the LD- end.

[0036] This embodiment improves the driving current stability to 6‰ by designing a constant current source, thereby solving the problem of insufficient driving current stability in the current butterfly seed laser control system. At the same time, this embodiment adds a power inductor to the LD-terminal to slow down the current change rate during power-on and power-off, which is beneficial to improving the service life of the butterfly seed laser.

[0037] Example 3: This example proposes a miniature high-precision butterfly seed light laser control system. Based on Example 1 or Example 2, an EMI filter is added. The main purpose of the EMI filter is to filter the external power supply and then provide a +5V power supply to the temperature control unit and drive circuit proposed in Example 1 and Example 2.

[0038] like Figure 4 As shown, in this embodiment, the EMI filter consists of a dual common mode filter L2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6 and a TVS diode D2.

[0039] Among them, the dual-path common-mode filter L2 suppresses common-mode signals through its special structure and working principle, mainly filtering out common-mode components in differential signals while allowing differential signals to pass smoothly, thereby improving signal purity, transmission quality and signal anti-interference ability.

[0040] The third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, and the sixth capacitor C6 are all filter capacitors. To filter out clutter in a wide frequency range, the third capacitor C3 and the fourth capacitor C4 are large capacitors of 100uF. To more effectively filter out clutter in the high-frequency range, the fifth capacitor C5 and the sixth capacitor C6 are small capacitors of 0.1uF.

[0041] Among them, the main function of TVS diode D2 is to protect the entire control system. Once the input voltage exceeds the rated voltage of the control system, TVS diode D2 will be turned on and the entire control system will be powered off immediately.

[0042] In addition, this embodiment also uses a third resistor R3 and a light-emitting diode D3 to form a power indicator light. When the control system is powered on normally, the light-emitting diode D3 lights up. The EMI filter in the control system proposed in this embodiment plays a role in suppressing electromagnetic interference, protecting equipment, and preventing radiation diffusion.

[0043] Example 4: This example proposes a miniature high-precision butterfly seed light laser control system, which adds a monitoring unit based on Example 1, Example 2, or Example 3.

[0044] like Figure 5 As shown in the figure, the core of the monitoring unit is the OPA235 chip, which is a dual-channel high-precision amplifier chip. It integrates two amplifiers, which are marked as the first amplifier OPA235a and the second amplifier OPA235b. The first amplifier OPA235a and the second amplifier OPA235b are used to build two voltage follower circuits for synchronously transmitting the voltage of the PD pin of the butterfly seed light laser and the voltage signal V output by the REF2000 chip U1. th Therefore, by monitoring the output voltage VPDtest of one voltage follower circuit, the output power of the butterfly seed laser can be known, and by monitoring the output voltage Vthtest of another voltage follower circuit, the current internal temperature of the butterfly seed laser can be known.

[0045] Figure 6 The 3-hour temperature curve of the butterfly seed light laser under the control of the control system proposed in any of the above embodiments is shown. The measured temperature stability is 15.4ppm, and the maximum temperature fluctuation within 3 hours is only 0.000385728°C.

[0046] Figure 7 The figure shows the 4-hour output optical power curve of the butterfly seed laser under the control of the control system proposed in any of the above embodiments. The butterfly seed laser model used in the test is LC96Z400-74, and the measured output optical power stability of the butterfly seed laser is 8.5‰.

[0047] Figure 8 The output curve diagram of the power regulation circuit in the driving unit proposed in this embodiment 2 is shown. The measured output stability of the power regulator is 0.12‰, and the regulated power can be stably output to the constant current driving circuit.

[0048] Figure 9 This is an output curve diagram of the constant current driving circuit in the driving unit proposed in this embodiment. The measured driving current stability is 6.3‰, which can ensure the stable output of the butterfly seed light laser.

Claims

1. A miniature high-precision butterfly seed laser control system, characterized in that: include: The temperature control unit is used to drive the TEC module inside the butterfly seed light laser to cool or heat according to the internal temperature of the butterfly seed light laser, so that the internal temperature of the butterfly seed light laser reaches the set temperature; Wherein, the temperature control unit comprises: a temperature adjustment circuit and a TEC driving circuit; The temperature adjustment circuit includes: a REF2000 chip and a first potentiometer; one of the REF2000 chips is used to convert the internal temperature of the butterfly seed laser into a corresponding voltage signal V th The other channel of the REF2000 chip is used to convert the set temperature into a corresponding voltage signal V set ; Change the set temperature by changing the resistance value of the first potentiometer; The TEC driving circuit includes a PD controller, which is used to convert the input voltage signal V th And the voltage signal V set It is converted into a voltage signal that drives the TEC module inside the butterfly seed light laser to control the cooling or heating of the TEC module.

2. A miniature high-precision butterfly seed laser control system according to claim 1, characterized in that: The temperature regulating circuit further comprises a protection resistor, one end of which is connected to the other output end of the REF2000 chip, and the other end of which is grounded via a first potentiometer.

3. A miniature high-precision butterfly seed laser control system according to claim 1, characterized in that: The PD controller includes a first OPA569 chip, a second OPA569 chip, a second resistor, a fourth resistor, a fifth resistor and a first capacitor; The positive input terminal of the first OPA569 chip is connected to an output terminal of the REF2000 chip to receive a voltage signal V th , the negative input terminal of the first OPA569 chip is connected to the output terminal of the first OPA569 chip; The positive input terminal of the second OPA569 chip is connected to the other output terminal of the REF2000 chip to receive the voltage signal V set , the negative input terminal of the second OPA569 chip is connected to the negative input terminal of the first OPA569 chip through a fourth resistor; and the negative input terminal of the second OPA569 chip is connected to the output terminal of the second OPA569 chip through a second resistor; The fifth resistor is connected in series with the first capacitor, and the free end of the fifth resistor is connected to the negative input end of the second OPA569 chip, and the free end of the first capacitor is connected to the output end of the second OPA569 chip.

4. A miniature high-precision butterfly seed laser control system according to claim 3, characterized in that: The PD controller is used to convert the input voltage signal V th And the voltage signal V set Converted into a voltage signal to drive the TEC module inside the butterfly seed laser to control the cooling or heating of the TEC module, including: The thermistor inside the butterfly seed laser is an NTC thermistor; The output of the PD controller is expressed as: ； ； In the formula, , Respectively represent the voltages of the TEC- and TEC+ pins output to the TEC module. is the resistance value of the second resistor, is the resistance value of the fourth resistor; When the internal temperature of the butterfly seed laser is higher than the set temperature, V set <V th , , control the TEC module cooling; When the internal temperature of the butterfly seed laser is lower than the set temperature, V set >V th , , control the TEC module to heat.

5. The micro high-precision butterfly seed laser control system according to claim 1, characterized in that: Also includes: A driving unit, used for generating a current to drive the butterfly seed light laser, so that the butterfly seed light laser outputs a fixed or linear power; The driving unit includes a power regulation circuit; The power regulation circuit comprises: an ADR4525 chip, a voltage-dividing resistor and at least 2-bit DIP switches; the output end of the ADR4525 chip is connected to the input end of one of the at least 2-bit DIP switches through a second potentiometer, and the output end of the ADR4525 chip is connected to the input end of the other paths of the at least 2-bit DIP switches through a fixed resistor; the output ends of all paths of the at least 2-bit DIP switches are grounded through the voltage-dividing resistor; By adjusting the second potentiometer, the butterfly seed light laser outputs linear power; The butterfly seed light laser outputs a fixed power through a fixed value resistor.

6. A miniature high-precision butterfly seed laser control system according to claim 5, characterized in that: The power regulation circuit also includes a first current limiting resistor, which is connected in series with a second potentiometer, and the free end of the current limiting resistor is connected to the output end of the ADR4525 chip, and the free end of the second potentiometer is connected to the input end of one of the at least 2-bit dip switches.

7. The micro high-precision butterfly seed laser control system according to claim 5, characterized in that: The driving unit further includes a constant current driving circuit; the constant current driving circuit includes an operational amplifier, an NMOS tube, a power inductor and a constant voltage chip; The positive input terminal of the operational amplifier is connected to the output terminals of all the paths of the at least 2-bit DIP switch, the negative input terminal of the operational amplifier is connected to the output terminal of the operational amplifier through the PD link, and the negative input terminal of the operational amplifier is grounded through the twenty-first resistor and the twenty-second resistor connected in series; the output terminal of the operational amplifier is connected to the gate of the NMOS tube through the second current limiting resistor to provide a gate voltage for the NMOS tube; The source of the NMOS tube is grounded through a twenty-second resistor; When the NMOS tube is turned on, a driving current provided to the butterfly seed light laser is generated at the drain of the NMOS tube, and the driving current flows through the power inductor to the LD- terminal; The constant voltage chip is connected to the LD+ terminal to make the voltage of the LD+ terminal constant; The LD+ end and the LD- end are connected to a butterfly seed light laser.

8. A miniature high-precision butterfly seed laser control system according to claim 7, characterized in that: A bidirectional diode is provided between the LD+ terminal and the LD- terminal.

9. The micro high-precision butterfly seed laser control system according to claim 7, characterized in that: The PD link is composed of a twentieth resistor and a second capacitor connected in parallel.

10. The micro high-precision butterfly seed laser control system according to claim 1, characterized in that: Also includes: A power supply unit; the power supply unit includes an EMI filter; the EMI filter is used to filter the external power supply and then supply power to the temperature control unit.

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