CN215452047U

CN215452047U - Stable-power and stable-wavelength laser light source

Info

Publication number: CN215452047U
Application number: CN202122868664.8U
Authority: CN
Inventors: 王士通
Original assignee: Hangzhou Huiming Quantum Communication Technology Co ltd
Current assignee: Hangzhou Huiming Quantum Communication Technology Co ltd
Priority date: 2021-11-22
Filing date: 2021-11-22
Publication date: 2022-01-07
Anticipated expiration: 2031-11-22

Abstract

A power-stabilizing and wavelength-stabilizing laser light source comprises a laser and a circuit control module, wherein the output end of the laser is connected with an electric control optical attenuator, the output end of the electric control optical attenuator is connected with a first optical beam splitter with a splitting ratio of 5:95, the output end with the splitting ratio of 95 is connected to the input end of a narrow-band filter, the output end with the splitting ratio of 5 is connected to a first photodiode for converting optical signals into electric signals, the output end of the narrow-band filter is connected with a second optical beam splitter with the splitting ratio of 5:95, and the output end with the splitting ratio of 5 is connected with a second photodiode. Compared with the prior art, the utility model can timely adjust the voltage of the optical attenuator to stabilize the output power of the light source without changing the spectral characteristic of the laser. The center wavelength of the light source is adjusted by controlling the operating temperature of the laser. It is ensured that the voltage variation of the feedback system is caused by the central wavelength variation of the laser.

Description

Stable-power and stable-wavelength laser light source

Technical Field

The utility model relates to the technical field of semiconductor lasers, in particular to a power-stabilizing wavelength-stabilizing laser source.

Background

Since the emergence of lasers in the sixties of the last century, the application of lasers is becoming more and more widespread due to the rapid development of laser technology. The figure of the robot is not poor in the fields of industrial processing, aerospace, scientific research and medical treatment. In many application scenarios, the power and wavelength stability of the laser are important parameter indicators.

Direct voltage control through power feedback is one of the most direct power stabilization methods, but generally such adjustment methods tend to change the spectral characteristics of the output laser. Even if the spectral characteristics can be kept stable, the operation process is cumbersome. The first method is relatively expensive, and the second method can obtain stable wavelength laser, but when the wavelength of the light source is jittered, the final output power is fluctuated.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model provides a stable-power and stable-wavelength laser light source as follows.

The technical scheme of the utility model is realized as follows:

a power-stabilizing wavelength-stabilizing Laser light source comprises a Laser and a circuit control module, wherein the output end of the Laser is connected with an electric control optical attenuator EVOA, the output end of the electric control optical attenuator EVOA is connected with a first optical beam splitter BS1 with a splitting ratio of 5:95, the output end with the splitting ratio of 95 is connected with the input end of a narrow-band filter Filter, the output end with the splitting ratio of 5 is connected with a first photodiode PIN1 for converting an optical signal into an electric signal, the output end of the narrow-band filter Filter is connected with a second optical beam splitter BS2 with the splitting ratio of 5:95, the output end with the splitting ratio of 5 is connected with a second photodiode PIN2 for feeding back the optical signal caused by wavelength jitter, and the circuit control module is respectively connected with the Laser, the electric control optical attenuator, the first photodiode PIN1 and the second photodiode 2.

Preferably, the circuit control module includes a first transimpedance amplifier TIA 1, a second transimpedance amplifier TIA 2, a first analog-to-digital conversion module AD1, a second analog-to-digital conversion module AD2, a first digital-to-analog conversion module DA1, a second digital-to-analog conversion module DA2, and an FPGA main control board, an input end of the first transimpedance amplifier TIA 1 is connected to a first photodiode PIN1, an output end of the first transimpedance amplifier TIA 1 is connected to the FPGA main control board through a first analog-to-digital conversion module AD1, an input end of the second transimpedance amplifier TIA 2 is connected to a second photodiode PIN2, an output end of the second transimpedance amplifier TIA 2 is connected to the FPGA main control board through a second analog-to-digital conversion module AD2, and output ends of the FPGA main control board are correspondingly connected to the Laser and the electrically controlled optical attenuator evaoa through the first digital-to-analog conversion module DA1 and the second digital-to-analog conversion module DA 2.

Preferably, the first transimpedance amplifier TIA 1 and the second transimpedance amplifier TIA 2 are amplifiers for amplifying weak current signals into voltage signals, and both of them are transimpedance amplifiers of type OPA 657.

Preferably, the first analog-to-digital conversion module AD1 and the second analog-to-digital conversion module AD2 both convert analog signals amplified by corresponding transimpedance amplifiers into digital signals, and then transmit the digital signals to the FPGA main control board for processing, and the first analog-to-digital conversion module AD1 and the second analog-to-digital conversion module AD2 both adopt analog-to-digital converters with the model number of AD 7091R.

Preferably, the first digital-to-analog conversion module DA1 and the second digital-to-analog conversion module DA2 both convert digital signals processed by the FPGA main control board into analog signals, and control the Laser or the electrically controlled optical attenuator EVOA by the analog signals, and the first digital-to-analog conversion module DA1 and the second digital-to-analog conversion module DA2 both use digital-to-analog converters with model number AD 5541.

Compared with the prior art, the utility model has the following beneficial effects:

the power-stabilizing wavelength-stabilizing laser source uses the electric control optical attenuator and the circuit control module to timely adjust the voltage of the optical attenuator to stabilize the output power of the laser source, and the adjustment of the external cavity power does not change the spectral characteristic of the laser, so the power-stabilizing wavelength-stabilizing laser source is simple and practical. And the narrow-band filter Filter and a power feedback system are used for detecting the wavelength change of the light source, and the central wavelength of the light source is adjusted by controlling the working temperature of the laser. The voltage change of the second-stage power feedback system caused by power jitter is avoided by stabilizing the output power of the laser firstly and then stabilizing the wavelength of the laser, and the voltage change of the feedback system is ensured to be caused by the change of the central wavelength of the laser.

Drawings

FIG. 1 is a schematic block diagram of a power-stabilized wavelength-stabilized laser light source according to the present invention;

FIG. 2 is a schematic block diagram of the circuit control module of the present invention.

Detailed Description

The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the utility model are shown.

As shown in figure 1, the stable power and stable wavelength Laser light source comprises a Laser and a circuit control module, wherein the output end of the Laser is connected with an electric control optical attenuator EVOA, the output end of the electric control optical attenuator EVOA is connected with a first optical beam splitter BS1 with a splitting ratio of 5:95, the output end with the splitting ratio of 95 is connected with the input end of a narrow-band filter Filter, the output end with the splitting ratio of 5 is connected with a first photodiode PIN1 for converting an optical signal into an electric signal, the output end of the narrow-band filter Filter is connected with a second optical beam splitter BS2 with the splitting ratio of 5:95, the output end with the splitting ratio of 5 is connected with a second photodiode PIN2 for feeding back the optical signal caused by wavelength jitter, the output end with the splitting ratio of 95 is used as the final output end of the light source, and the circuit control module is respectively connected with the Laser, the electric control optical attenuator EVOA, the Laser, the narrow-band filter EVOA, the first optical beam splitter BS1 and the second optical splitter, The current information fed back by the first photodiode PIN1 and the second photodiode PIN2 and the first photodiode PIN1 is transmitted to the circuit control module, so that the circuit control module sends information to change the driving voltage of the electrically controlled optical attenuator EVOA to change the attenuation value of the electrically controlled optical attenuator EVOA, and the output light power is changed. Similarly, the current information fed back by the second photodiode PIN2 is transmitted to the circuit control module, so that the circuit control module changes the temperature control voltage of the Laser, changes the temperature of the Laser, and changes the center wavelength of the Laser.

As shown in fig. 2, the circuit control module includes a first transimpedance amplifier TIA 1, a second transimpedance amplifier TIA 2, a first analog-to-digital conversion module AD1, a second analog-to-digital conversion module AD2, a first digital-to-analog conversion module DA1, a second digital-to-analog conversion module DA2, and an FPGA main control board, the input end of the first transimpedance amplifier TIA 1 is connected with a first photodiode PIN1, the output end of the first transimpedance amplifier TIA 1 is connected with the FPGA main control board through a first analog-to-digital conversion module AD1, the input end of the second transimpedance amplifier TIA 2 is connected with a second photodiode PIN2, the output end of the second transimpedance amplifier TIA 2 is connected with the FPGA main control board through a second analog-to-digital conversion module AD2, the output end of the FPGA main control board is correspondingly controlled and connected with a Laser and an electric control optical attenuator EVOA through a first digital-to-analog conversion module DA1 and a second digital-to-analog conversion module DA2, and the specific principle of the circuit control module is as follows: the trans-impedance amplifier converts the current signal received by the photodiode into a voltage signal and amplifies the voltage signal. The analog-digital conversion module is used for converting an analog signal amplified by the transimpedance amplifier into a digital signal, and the digital-analog conversion module is used for converting a digital signal processed by the FPGA into an analog signal and transmitting the analog signal to the laser or optical attenuator driving module. The FPGA main control board is used for controlling the working state of the laser. And comparing the digital signal subjected to analog-to-digital conversion with a reference value by the FPGA and outputting the digital signal. Finally obtaining stable output through multiple cycle comparison.

The first transimpedance amplifier TIA 1 and the second transimpedance amplifier TIA 2 are amplifiers for amplifying weak current signals into voltage signals, and both of the amplifiers are of the type OPA 657.

The first analog-to-digital conversion module AD1 and the second analog-to-digital conversion module AD2 convert analog signals amplified by corresponding transimpedance amplifiers into digital signals and then send the digital signals to the FPGA main control board for processing, and the first analog-to-digital conversion module AD1 and the second analog-to-digital conversion module AD2 both adopt analog-to-digital converters with the model number of AD 7091R.

The first digital-to-analog conversion module DA1 and the second digital-to-analog conversion module DA2 convert digital signals processed by the FPGA main control board into analog signals, and the analog signals control the Laser or the electric control optical attenuator EVOA, and the first digital-to-analog conversion module DA1 and the second digital-to-analog conversion module DA2 both adopt digital-to-analog converters with the model number of AD 5541.

The utility model relates to a mode of utilizing the stability of power and wavelength outside a cavity, which has the following principle: a portion of the light is split by a beam splitter for feedback of power, and the power output is stabilized by an optical attenuator. And then the light source wavelength jitter is detected through the filtering action of the narrow-band filter Filter. When the central wavelength of the laser shakes, the light power transmitted through the narrow-band filter will fluctuate, and then the light power is fed back to the working temperature of the laser through the power detection system, so that the wavelength can be adjusted in a small range. Finally, the laser light source system with stable power and wavelength is obtained.

According to the structural principle of the utility model, the power-stabilizing wavelength-stabilizing laser light source uses the electric control optical attenuator and the circuit control module, the voltage of the optical attenuator is timely adjusted to stabilize the output power of the light source, and the adjustment of the power outside the cavity does not change the spectral characteristic of the laser, so that the power-stabilizing wavelength-stabilizing laser light source is simple and practical. And the narrow-band filter Filter and a power feedback system are used for detecting the wavelength change of the light source, and the central wavelength of the light source is adjusted by controlling the working temperature of the laser. The voltage change of the second-stage power feedback system caused by power jitter is avoided by stabilizing the output power of the laser firstly and then stabilizing the wavelength of the laser, and the voltage change of the feedback system is ensured to be caused by the change of the central wavelength of the laser.

Claims

1. A kind of steady power steady wavelength laser light source, characterized by: the Laser comprises a Laser and a circuit control module, wherein the output end of the Laser is connected with an electric control optical attenuator EVOA, the output end of the electric control optical attenuator EVOA is connected with a first optical beam splitter BS1 with the splitting ratio of 5:95, the output end with the splitting ratio of 95 is connected to the input end of a narrow-band filter Filter, the output end with the splitting ratio of 5 is connected with a first photodiode PIN1 for converting optical signals into electric signals, the output end of the narrow-band filter Filter is connected with a second optical beam splitter BS2 with the splitting ratio of 5:95, the output end with the splitting ratio of 5 is connected with a second photodiode PIN2 for feeding back the optical signals caused by wavelength jitter, and the circuit control module is respectively connected with the Laser, the electric control optical attenuator EVOA, the first photodiode PIN1 and the second photodiode PIN 2.

2. The power-stabilized wavelength-stabilized laser light source of claim 1, wherein the circuit control module comprises a first transimpedance amplifier TIA 1, a second transimpedance amplifier TIA 2, a first analog-to-digital conversion module AD1, a second analog-to-digital conversion module AD2, a first digital-to-analog conversion module DA1, a second digital-to-analog conversion module DA2 and an FPGA main control board, the input end of the first transimpedance amplifier TIA 1 is connected with a first photodiode PIN1, the output end of the first transimpedance amplifier TIA 1 is connected with the FPGA main control board through a first analog-to-digital conversion module AD1, the input end of the second transimpedance amplifier TIA 2 is connected with a second photodiode PIN2, the output end of the second transimpedance amplifier TIA 2 is connected with the FPGA main control board through a second analog-to-digital conversion module AD2, the output end of the FPGA main control board is correspondingly controlled and connected with the Laser and the electric control optical attenuator EVOA through the first digital-to-analog conversion module DA1 and the second digital-to-analog conversion module DA 2.

3. The stabilized-power wavelength-stabilized laser light source of claim 2, wherein the first transimpedance amplifier TIA 1 and the second transimpedance amplifier TIA 2 both employ a transimpedance amplifier of type OPA 657.

4. The power-stabilized wavelength-stabilized laser light source of claim 2, wherein the first analog-to-digital conversion module AD1 and the second analog-to-digital conversion module AD2 both use an analog-to-digital converter with model number AD 7091R.

5. The stable-power wavelength-stabilized laser light source of claim 2, wherein the first digital-to-analog conversion module DA1 and the second digital-to-analog conversion module DA2 both use a digital-to-analog converter with model number AD 5541.