A 1.5 micron passive Q-switched laser

Abstract

The invention discloses a 1.5-micron passive Q-switched laser. The 1.5-micron passive Q-switched laser comprises N pumping sources, a resonant cavity, a light beam coupling device and a first opticalfiber, wherein the N pumping sources are the same in work period and work duty ratio, and the resonant cavity, the light beam coupling device and the first optical fiber are sequentially arranged on the light-emitting sides of the N pumping sources. The N pumping sources are used for sequentially emitting pumping light at fixed time intervals in one working period; the pulse width of the pumping source is equal to the fixed time interval; the resonant cavity is used for pumping the laser crystals in the resonant cavity by utilizing the N pump light to obtain N beams of 1.5-micron laser emittedfrom different positions of the laser crystals, and each beam of laser is emitted after being reflected for multiple times in the resonant cavity; the light beam coupling device is used for couplingthe N beams of laser emitted from the resonant cavity into the first optical fiber to form a single path of laser; and the first optical fiber is used for transmitting and emitting single-path laser.The 1.5-micron passive Q-switched laser can output continuous pulse laser in a single path under the conditions of high peak power and chopping pumping, and the application range of the 1.5-micron passive Q-switched laser is effectively expanded.

Description

technical field [0001] The application relates to a 1.5-micron passive Q-switched laser, belonging to the technical field of lasers. Background technique [0002] With the continuous increase of domestic car ownership, the accident rate of car driving has continued to rise, and people's demand for vehicle safety has generally increased. With its excellent target detection technology, vehicle lidar can effectively reduce the occurrence of automobile accidents and is widely used in intelligent driving technology. The laser light source used in automotive lidar should have the characteristics of high repetition rate, narrow laser pulse and high peak power. Passive Q-switching is a method commonly used to achieve high repetition frequency, narrow pulse width, and high peak power laser pulse output. It has the advantages of compact structure and small size, so it is often used as a laser light source for vehicle-mounted lidar. 1.5 micron is located in the safe band for human ey...

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Problems solved by technology

[0005] The purpose of this application is to provide a 1.5-micron passive Q-switched laser to solve the technical problem that existing 1.5-micron passive Q-switched lasers use chopping to pump the crystal, resulting in discontinuous output laser pulses

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