Dual-wavelength alternative Q-switching laser and laser output method thereof

Abstract

The present invention relates to a dual-wavelength alternative Q-switching laser and a laser output method thereof. The laser comprises a pumping source, a Q-switching element, and a front endoscope, a laser gain medium, a polarization element and a rear endoscope which are arranged orderly. The pumping source adopts a side surface or end face pumping mode, and a light splitting module used for arranging the light separately according to the wavelengths, a polarization control element used for controlling the polarization state of the output light and a wavelength selection module used for selecting the wavelength of the output light are arranged orderly between the polarization element and the rear endoscope. The incident end and the emergent end of the wavelength selection module are respectively an incident polarization spectroscope and an emergent polarization spectroscope, and a first sub-cavity and a second sub-cavity of the wavelength selection module share the incident polarization spectroscope and the emergent polarization spectroscope and both comprise the wavelength selection holes. The laser pulse outputted by the laser has the characteristics of being able to tune the laser wavelength and the dual-wavelength spacing, etc., and the Q-switching laser pulse output of the dual-wavelength perfect coaxial controllable rapid alternative change can be realized.

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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