A dual-wavelength alternately Q-switched laser and its laser output method

Abstract

A dual-wavelength alternate Q-switched laser and a laser output method thereof, the laser includes a pump source, a Q-switched element, and a sequentially arranged front cavity mirror, a laser gain medium, a polarization element, and a rear cavity mirror, and the pump source adopts Side or end pumping mode, between the polarizing element and the rear cavity mirror, a spectroscopic module for separating and arranging the light according to wavelength, a polarization control element for controlling the polarization state of the output light, and a device for selecting the wavelength of the output light are arranged in sequence. A wavelength selection module, the incident end and the exit end of the wavelength selection module are respectively an incident polarization beam splitter and an exit polarization beam splitter, and the first subcavity and the second subcavity of the wavelength selection module share the entrance polarization beam splitter and the exit polarization beam splitter , and both the first sub-cavity and the second sub-cavity include wavelength selective holes. The laser output laser pulse has the characteristics of laser wavelength and dual-wavelength spacing can be tuned, and can realize Q-switched laser pulse output with perfect coaxial controllable and fast alternating changes of dual wavelengths.

Description

technical field [0001] The invention provides a dual-wavelength alternate Q-switched laser and a laser output method thereof, which belong to the field of solid-state lasers. Background technique [0002] Lidar is a radar system that emits a laser beam and detects the position, speed and other characteristics of the target according to the laser signal scattered back from the target. The development of lidar has been highly concerned by the military of various countries. Laser deception jamming technology is a common way of photoelectric jamming. The jammer actively emits laser radiation signals that are correlated with radar lasers to confuse the lidar measurement system, so as to achieve the purpose of destroying lidar detection. [0003] Laser optoelectronic countermeasures urgently require laser wavelengths to be able to switch wavelength codes like microwave frequency hopping countermeasures. The laser with dual-wavelength alternate output is used instead of the singl...

AI Technical Summary

Problems solved by technology

However, with this design, the laser output is not on the same axis, and for a certain laser crystal, the interval between the two wavelengths that can be output is fixed. As a coded laser radar, it is easy to be identified and cracked.

A modification of this method is to use prism dispersion to split the light. After the splitting, the two wavelengths are separated by adding a dispersion prism, a Q-switch crystal, and a total reflection mirror. more difficult

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