External cavity feedback laser device

Abstract

The embodiment of the invention discloses an external cavity feedback laser device. The external cavity feedback laser device comprises a seed light source, a one-way transmission module, an F-P cavity, a phase adjusting module and a light steering module, wherein the seed light source is used for outputting a seed beam; the one-way transmission module is used for transmitting the seed light beam to the F-P cavity and preventing a reflected light beam of the F-P cavity from entering the seed light source; the light steering module is used for changing the transmission direction of the transmitted light beam of the F-P cavity so as to enable the transmitted light beam to be fed back to the seed light source to form an annular light path; and the phase adjusting module is used for adjusting the phase of the light beam in the annular light path so as to enable the F-P cavity to meet the frequency locking condition and form frequency-locked laser. According to the technical scheme of the embodiment of the invention, the small-size and high-Q-value F-P cavity with the magnitude of centimeter or below is adopted to form the narrow-linewidth frequency-locked laser for external cavity feedback, and the device has advantages of simple structure, small size, low cost and the like.

Description

technical field [0001] Embodiments of the present invention relate to laser technology, and in particular to an external cavity feedback laser device. Background technique [0002] Narrow linewidth lasers with low frequency noise are essential core devices for coherent laser communication, laser sensing (such as fiber optic sensing hydrophones), and wind lidar. In the future, intercity and space laser coherent communication with further improved performance, frequency-modulated continuous wave lidar for artificial intelligence environment perception, space gravity detection, atomic and molecular measurement, etc. higher requirements have been put forward. [0003] Traditional solid-state, optical fiber and other narrow-linewidth lasers can reach the linewidth of hundreds of hertz (Hz) to kilohertz (kHz), but they are expensive, bulky, and cover extremely limited wavelengths, making it difficult to popularize and apply. Semiconductor lasers can be mass-produced at low cost,...

AI Technical Summary

Problems solved by technology

The use of high-quality factor external cavity optical feedback can significantly narrow the linewidth of semiconductor lasers. So far, research on narrow linewidth lasers based on Fabry-Perot (F-P) cavities has only stayed in the laboratory and has not been transformed into products and productivity. , the main reason is that the optical structure of the narrow linewidth laser based on the external cavity in the existing research is complex, the phase modulation method is complicated (such as the PDH electrical feedback method), and the F-P cavity with a large size (>10cm) is used, which cannot Reliable product packaged for miniaturization

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