Acousto-optic modulating cavity dumping CO2 laser device

Abstract

The invention discloses an acousto-optic modulating cavity dumping CO2 laser device and belongs to the technical field of lasers. The acousto-optic modulating cavity dumping CO2 laser device aims at solving the problem that an existing acousto-optic Q-Switched laser is large in pulse width and the acousto-optic Q switching cannot achieve effective turn-off of the laser on the condition of higher laser gain. The laser device is coaxially provided with a concave total reflector, a laser pipe, an acousto-optic modulator and a plane total reflector in sequence from left to right. A signal generator is connected with the acousto-optic modulator, the concave total reflector and the plane total reflector form a laser oscillation cavity, the laser pipe is used for generating laser grain, the acousto-optic modulator is inserted into the cavity, the signal generator is used for accurately controlling an oscillation laser beam of the acousto-optic modulator to oscillate back and forth in the cavity, the laser beam is diffracted out of the cavity by the acousto-optic modulator, and laser output is formed. The laser repetition frequency is determined by signals input by the signal generator, and the pulse width is determined by the time spent by the oscillation laser for oscillating back and forth in the cavity. In the laser device, the plane total reflector in the resonant cavity is replaced by a plane reflecting optical grating. According to the laser device, the resonant cavity is replaced by a three-mirror folded cavity.

Description

technical field [0001] The present invention relates to a cavity emptying based on intracavity acousto-optic modulation with high repetition rate and narrow pulse width far-infrared CO 2 A laser belongs to the technical field of lasers. Background technique [0002] Small high repetition rate, narrow pulse width CO 2 Lasers have a wide range of application requirements in the fields of laser processing, lidar, environmental detection, laser medical treatment, and laser-matter interaction. Currently small and medium CO 2 The methods of laser pulse output mainly include electro-optic Q-switching, mechanical Q-switching and acousto-optic Q-switching in the resonant cavity. Electro-optic Q-switching usually uses CdTe crystals as switching devices, the pulse frequency can reach 100kHz, and the pulse width can be compressed to the order of hundreds of ns. However, because electro-optic Q-switching requires high voltage, the structure is relatively complicated, which is not cond...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the pulse width of the acousto-optic Q-switched laser is wide in the prior art, and under high laser gain, the problem that the acousto-optic Q-switched laser cannot be effectively turned off, the present invention provides a high repetition rate, narrow Pulse Width Acousto-Optic Modulation for Cavity Empty CO 2 laser

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