CN-116646804-B - Optical fiber laser device capable of rapidly adjusting pulse output power and laser radar

CN116646804BCN 116646804 BCN116646804 BCN 116646804BCN-116646804-B

Abstract

The invention discloses an optical fiber laser device and a laser radar for quickly adjusting pulse output power, wherein the optical fiber laser device comprises a seed light source, a wavelength division multiplexer, an amplifier, a demultiplexer, an optical fiber beam splitter, a power monitoring circuit, a signal processing circuit, a laser main control circuit and a seed drive, wherein the laser main control circuit is connected with the seed drive and the signal processing circuit, the seed drive is connected with the seed light source, and the power monitoring circuit is connected with the optical fiber beam splitter and the signal processing circuit. In the invention, the signal light generated by the first seed light source and the second seed light source firstly pass through the wavelength division multiplexer and then sequentially enter the multistage optical fiber amplifier and the demultiplexer, and then are divided into two paths of output light, wherein one path of output light passes through the optical fiber splitter and enters the power monitoring circuit to realize the purpose of monitoring the main output power, so that the purpose of adjusting the main output power is realized according to the size of the main output power, the stability of the main output power of the laser is ensured, and the cost is controllable.

Inventors

CAI ZHEN
LIU YANG
ZHANG MING

Assignees

江苏亮点光电研究有限公司

Dates

Publication Date: 20260508
Application Date: 20230607

Claims (7)

1. The optical fiber laser device is characterized by comprising a laser light path structure and a laser circuit structure, wherein the laser light path structure comprises a seed light source, a wavelength division multiplexer, an amplifier, a demultiplexer and an optical fiber splitter which are sequentially arranged along the light incidence direction, the laser circuit structure comprises a power monitoring circuit, a signal processing circuit, a laser main control circuit and a seed drive, the laser main control circuit is connected with the seed drive and the signal processing circuit, the seed drive is connected with the seed light source, and the power monitoring circuit is connected with the optical fiber splitter and the signal processing circuit; the seed light source comprises a first seed light source and a second seed light source, the seed drive comprises a first seed drive and a second seed drive, the first seed light source is connected with the first seed drive, the second seed light source is connected with the second seed drive, the laser main control circuit is respectively connected with the first seed drive and the second seed drive, signal lights generated by the first seed light source and the second seed light source enter an amplifier and a demultiplexer in sequence through a wavelength division multiplexer, and part of output light of the demultiplexer enters a power monitoring circuit through an optical fiber beam splitter; the electrical signals of the first seed drive and the second seed drive are the same in frequency and constant in time difference; and adjusting the power of the second seed light source according to the value fed back by the power monitoring circuit, reducing the amplifying capability of the first seed light source signal light when the power of the first arrived second seed light source signal light is increased, and improving the amplifying capability of the first seed light source signal light when the power of the first arrived second seed light source signal light is reduced.
2. The fiber laser device of claim 1, wherein the output of the first seed light source is a pulsed light output and the output of the second seed light source is a pulsed light output or a continuous light output.
3. The fiber laser device of claim 1, wherein the first and second seed light sources have wavelengths of 1530-1565nm, respectively, and the first and second seed light sources have output spectral intervals of greater than 5nm.
4. A fiber laser device for rapid pulse output power adjustment according to claim 3, wherein the first seed light source is a semiconductor laser of DFB structure, generating a pulse light signal of 5-20 mw and 1-100 ns.
5. The fiber laser device for rapidly adjusting pulse output power according to claim 1, wherein the frequency of the electrical signal is 50-2000 khz and the time difference is 10-200 ns.
6. A lidar comprising a fiber laser device of any of claims 1-5 for rapid adjustment of pulse output power.
7. The lidar of claim 6, further comprising radar transmitting means, APD amplitude feedback, APD drive, receiving APD, and radar receiving means, wherein the output light of the laser light path structure is applied to the target object via the radar transmitting means, the radar receiving means is configured to receive light reflected from the surface of the target object and focus the light onto a light receiving surface receiving APD, the receiving APD is coupled to the APD drive, the APD drive is coupled to the APD amplitude feedback, and the APD amplitude feedback is coupled to the signal processing circuitry of the laser circuit structure.

Description

Optical fiber laser device capable of rapidly adjusting pulse output power and laser radar Technical Field The invention belongs to the technical field of laser radars, and particularly relates to an optical fiber laser device capable of rapidly adjusting pulse output power and a laser radar. Background With the heat of the fire in the unmanned field, the laser radar is used as an information acquisition port for automatic driving, and the parameter index and the data acquisition speed of the laser radar are required to develop rapidly. Correspondingly, for the fiber laser for radar, parameters such as response speed, stability and the like are also increasingly valued by radar manufacturers. In general, an optical fiber laser used in a laser radar adopts a MOPA structure, namely a seed light plus a multi-stage light amplifying structure, so as to obtain a high-energy pulse light signal required by the radar. In general, in order to adjust the optical power finally output by the laser, only the last stage of pumping power in the amplifier needs to be adjusted, but the pumping is affected by temperature, the current cannot be accurately controlled, and the pumping current modulation speed is limited, so that the power stability and the power adjustment speed of the fiber laser for the radar cannot be adapted to the high standard requirements of radar manufacturers. Fast dynamic adjustment of optical power is a troublesome problem for fiber lasers. Therefore, the invention discloses an optical fiber laser device and a laser radar for rapidly adjusting pulse output power. Disclosure of Invention In order to solve the technical problems in the prior art, the invention aims to provide an optical fiber laser device and a laser radar for rapidly adjusting pulse output power. In order to achieve the above purpose and achieve the above technical effects, the invention adopts the following technical scheme: The utility model provides a quick adjustment pulse output's fiber laser device, includes laser instrument light path structure and laser instrument circuit structure, laser instrument light path structure includes seed light source, wavelength division multiplexer, amplifier, demultiplexer and the fiber spectroscope that sets gradually along the light incident direction, laser instrument circuit structure includes power monitoring circuit, signal processing circuit, laser instrument master control circuit and seed drive, laser instrument master control circuit links to each other with seed drive and signal processing circuit, seed drive links to each other with the seed light source, power monitoring circuit links to each other with fiber spectroscope and signal processing circuit. Further, the seed light source comprises a first seed light source and a second seed light source, the seed driving comprises a first seed driving and a second seed driving, the first seed light source is connected with the first seed driving, the second seed light source is connected with the second seed driving, the laser main control circuit is respectively connected with the first seed driving and the second seed driving, signal light generated by the first seed light source and the second seed light source sequentially enters the amplifier and the demultiplexer through the wavelength division multiplexer, and part of output light of the demultiplexer enters the power monitoring circuit through the optical fiber splitter. Further, the output of the first seed light source is a pulse light output, and the output of the second seed light source is a pulse light output or a continuous light output. Further, the wavelengths of the first seed light source and the second seed light source are 1530-1565nm respectively, and the output spectrum interval of the first seed light source and the second seed light source is more than 5nm. Further, the first seed light source is a semiconductor laser with a DFB structure, and generates a pulse light signal with adjustable 5-20 mw and adjustable 1-100 ns. Further, the electrical signals of the first seed drive and the second seed drive are the same frequency and have constant time difference. Further, the signal frequency is 50-2000 KHz, and the time difference is 10-200 ns. The invention also discloses a laser radar which comprises the optical fiber laser device for rapidly adjusting the pulse output power. Further, the laser radar further comprises a radar transmitting device, an APD amplitude feedback, an APD drive, a receiving APD and a radar receiving device, wherein the output light of the laser light path structure acts on a target object through the radar transmitting device, the radar receiving device is used for receiving the light reflected from the surface of the target object and focusing the light on the light receiving surface of the receiving APD, the receiving APD is connected with the APD drive, the APD drive is connected with the APD amplitude feedback, and the APD amplitude fee