Driving and stabilization system for pump laser

Patent metadata

Field	Value
Publication number	US-12088057-B2
Application number	US-202117528315-A
Country	US
Kind code	B2
Filing date	Nov 17, 2021
Priority date	Nov 17, 2020
Publication date	Sep 10, 2024
Grant date	Sep 10, 2024

Abstract

A driving and stabilization system for a pump laser, and a pump laser system. The driving and stabilization system includes a constant current stabilization device, a constant temperature stabilization device, a power detection device, an environment detection device, and a control device. The constant current stabilization device includes a voltage comparison circuit, a constant current driving circuit, and a switch protection circuit. The constant temperature stabilization device includes an internal constant temperature stabilization circuit and an external constant temperature stabilization circuit.

First claim

What is claimed is:

1. A driving and stabilization system for a pump laser, the pump laser comprising a laser diode, a semiconductor cooler and a laser detector, and connected to a stabilization grating at a tail thereof; the driving and stabilization system comprising:
a control device configured to output a constant current algorithm voltage by a built-in algorithm of the control device, and output a switching signal;
a constant current stabilization device comprising:
a voltage comparison circuit configured to receive and compare a constant current setting voltage, the constant current algorithm voltage and a constant current feedback voltage from the control device to output a constant current control voltage according to a comparison result,
a constant current driving circuit connected to the laser diode, and configured to receive the constant current control voltage from the voltage comparison circuit and output a constant driving current according to the constant current control voltage, and
a switch protection circuit connected to the laser diode, and configured to receive the switching signal from the control device to control the passage of the constant driving current through the laser diode;

a constant temperature stabilization device comprising:
an internal constant temperature stabilization circuit connected to the semiconductor cooler in the pump laser, and configured to receive an internal temperature control parameter and output a first PWM temperature control signal to the semiconductor cooler in the pump laser according to the internal temperature control parameter, and
an external constant temperature stabilization circuit connected to an external semiconductor cooler at the stabilization grating, and configured to receive an external temperature control parameter and output a second PWM temperature control signal to the external semiconductor cooler at the stabilization grating according to the external temperature control parameter;

a power detection device connected to the laser detector in the pump laser, and configured to receive a power detection current from the pump laser and output a power detection voltage to the control device; and
an environment detection device connected to a grating environment temperature resistor and a system environment temperature resistor, and configured to receive a grating environment voltage from the grating environment temperature resistor and a system environment voltage from the system environment temperature resistor, and output an environment detection voltage to the control device.

2. The driving and stabilization system according to claim 1 , wherein the constant current driving circuit comprises an input terminal and an output terminal, wherein the input terminal of the constant current driving circuit is configured to receive the constant current control voltage output by the voltage comparison circuit, the output terminal of the constant current driving circuit is configured to output the constant driving current.

3. The driving and stabilization system according to claim 2 , wherein the voltage comparison circuit comprises a first input terminal, a second input terminal, a third input terminal and an output terminal, wherein the first input terminal of the voltage comparison circuit is configured to receive the constant current setting voltage, the second input terminal of the voltage comparison circuit is configured to receive the constant current algorithm voltage, the third input terminal of the voltage comparison circuit is configured to receive the constant current feedback voltage, and the output terminal of the voltage comparison circuit is connected to the input terminal of the constant current driving circuit and configured to output the constant current control voltage.

4. The driving and stabilization system according to claim 3 , wherein the control device comprises a first input terminal, a second input terminal, a first output terminal, a second output terminal and a third output terminal, wherein the first input terminal of the control device is configured to receive the power detection voltage output by the power detection system, the second input terminal of the control device is configured to receive the system environment voltage output by the environment detection system, the first output terminal of the control device is connected to the first input terminal of the voltage comparison circuit and configured to output the constant current setting voltage, the second output terminal of the control device is connected to the second input terminal of the voltage comparison circuit and configured to output the constant current algorithm voltage, and the third output terminal of the control device is connected to the switch protection circuit and configured to output the switching signal.

5. The driving and stabilization system according to claim 1 , wherein the switch protection circuit comprises an input terminal and an output terminal, wherein the input terminal of the switch protection circuit is configured to receive the switching signal, and the output terminal of the switch protection circuit is connected to the laser diode.

6. The driving and stabilization system according to claim 1 , wherein the internal constant temperature stabilization circuit comprises an input terminal, and an output terminal, wherein the input terminal of the internal constant temperature stabilization circuit is configured to receive the internal temperature control parameter, and the output terminal of the internal constant temperature stabilization circuit is connected to the semiconductor cooler in the pump laser and configured to output the first PWM temperature control signal.

7. The driving and stabilization system according to claim 1 , wherein the external constant temperature stabilization circuit comprises an input terminal, and an output terminal, wherein the input terminal of the external constant temperature stabilization circuit is configured to receive the external temperature control parameter, and the output terminal of the external constant temperature stabilization circuit is connected to the external semiconductor cooler at the stabilization grating and configured to output the second PWM temperature control signal.

8. The driving and stabilization system according to claim 1 , wherein the power detection device comprises an input terminal and an output terminal, wherein the input terminal of the power detection device is configured to receive the power detection current output by the laser detector in the pump laser, and the output terminal of the power detection device is connected to the control device and configured to output the power detection voltage.

9. The driving and stabilization system according to claim 1 , wherein the environment detection device comprises a first input terminal, a second input terminal and an output terminal, wherein the first input terminal of the environment detection device is configured to receive the grating environment voltage output by the grating environment temperature resistor, the second input terminal of the environment detection device is configured to receive the system environment voltage output by the system environment temperature resistor, and the output terminal of the environment detection device is connected to the control device and configured to output the environment detection voltage.

10. The driving and stabilization system according to claim 1 , wherein the laser diode is cross connected to a laser diode stabilization circuit comprising a stabilization capacitor and a stabilization diode, the stabilization capacitor is connected to the laser diode in parallel, and the stabilization d

Assignees

• Chongqing Institute Of East China Normal Univ
• Roi Optoelectronics Tech Co Ltd
• Univ East China Normal

Inventors

• Zeng Heping
• Wang Xiao
• Li Shuang
• Hu Mengyun

Classifications

• H01S5/06808

  by monitoring the electrical laser parameters, e.g. voltage or current · CPC title

• H01S5/06804

  by monitoring an external parameter, e.g. temperature · CPC title

• H01S5/02446

  Cooling being separate from the laser chip cooling · CPC title

• H01S5/02415

  by using a thermo-electric cooler [TEC], e.g. Peltier element · CPC title

• H01S3/0014 Primary

  Monitoring arrangements not otherwise provided for (photometry G01J1/00, e.g. G01J1/4257; radiation pyrometry G01J5/00; measuring coherence of light G01J9/00; measuring wavelength of light G01J9/00, e.g. G01J9/0246; measuring optical pulses G01J11/00; calorimetrically measuring power of laser beams G01K17/003) · CPC title