Injection lock correction method and device

An injection locking and correction method technology, applied in laser devices, semiconductor laser devices, electrical components, etc., can solve the problems of wavelength mismatch and loss of lock between master and slave lasers, and achieve the effect of improving stability and avoiding loss of lock.

Active Publication Date: 2021-11-02
HESAI TECH CO LTD
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Problems solved by technology

[0005] However, the locking range of injection locking is only a few GHz, and usually requires strict wavelength alignment of the master and slave lasers. Due to the influence of factors such as temperature drift or laser internal stress release, the wavelength mismatch of the master and slave lasers will result in loss of lock. At this time Usually only manual adjustments can be made to make the slave laser enter the locked state again

Method used

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  • Injection lock correction method and device
  • Injection lock correction method and device
  • Injection lock correction method and device

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Embodiment Construction

[0066] As mentioned above, lidar is an active detection device, which is equipped with a light source. The laser radar can obtain the parameter data of the target by transmitting detection signals to the target and performing data processing according to the echo signal reflected by the target.

[0067] In order to enable tunable narrow linewidth lasers to output high-power laser signals, injection locking technology can be used. Specifically, the implementation of injection locking requires a master laser as a seed light source (Seed Laser) and a slave laser that emits a high-power laser signal. The master laser emits an injection laser signal to the slave laser through an injection locking device. Under certain conditions, the slave laser can be in A stable oscillation is established at the frequency of the injected laser signal, the free-running mode of the slave laser is suppressed, and it enters a locked state to follow the frequency of the master laser.

[0068] The esse...

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Abstract

The invention discloses an injection locking correction method and device. The method comprises the steps of: changing the size of an injection current of a slave laser, and controlling an injection locking state of the slave laser to be continuously changed between a lock losing state and a locking state; performing delay coupling and beat frequency processing on a laser signal output from the laser to obtain a beat frequency signal; based on the beat frequency signal, determining a corresponding injection current range when the slave laser is in a locked state, and taking a central value of the injection current range as a correction current value; and adjusting the magnitude of the injection current of the slave laser to the correction current value. By adopting the injection locking correction method and device, the injection locking stability can be improved, and the slave laser is in the locked state for a long time.

Description

[0001] This application claims the priority of a Chinese patent with the application number 202010368451.6 and the invention title "Injection Locking Correction Method and Device" submitted to the China Patent Office on April 30, 2020, the entire contents of which are incorporated by reference in this application. technical field [0002] The embodiments of this specification relate to the field of optoelectronic technology, and in particular to an injection locking correction method and device thereof. Background technique [0003] LiDAR (Light Detection And Range, LIDAR or Laser Detection And Range, LADAR) is an active detection device, which is equipped with a light source, and after data processing by sending detection signals to the target and performing data processing according to the echo signal reflected by the target, it can Get parameter data for the target. [0004] Frequency Modulated Continuous Wave (FMCW) lidar usually requires a high-coherence, high-power fre...

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Application Information

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IPC IPC(8): H01S5/40
CPCH01S5/4006
Inventor 潘政清向少卿孙恺
Owner HESAI TECH CO LTD
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