Solid-state laser with dot matrix output based on Damman grating

Abstract

The invention relates to a dot matrix output solid laser based on a Dammannn grating. The laser sequentially comprises a laser pumping source, a collimating lens, the dot matrix Dammann grating, a focusing lens, a laser medium and an output mirror on a laser path. The output end of the laser pumping source is placed on an object space focal point of the collimating lens, the working wavelength of the dot matrix Dammann grating is the central wavelength of the pumping light, the dot matrix Dammann grating is placed between the collimating lens and the focusing lens, and the front surface of the laser medium is plated with double-color film which fully reflects lasers and has an anti-reflection effect on the pumping light, the rear surface of the laser medium serving as a front endoscope of the laser and is plated with a laser anti-reflection film, the output mirror is plated with a laser partial-transmission film, and the output mirror and the front surface of the laser medium form a laser resonant cavity. According to the dot matrix output solid laser, only one laser pump source is used, a collimating and focusing coupling system is used for performing dot matrix pumping on the laser medium, and the dot matrix output solid laser has the advantages of being simple and compact in structure and easy to obtain.

Description

technical field [0001] The invention relates to a solid-state laser, in particular to a dot-matrix output solid-state laser based on a Damman grating. Background technique [0002] In recent years, excessive PM2.5 and smog in many places have seriously affected the quality of life and health of urban residents. Exhaust emissions from various vehicles powered by internal combustion engines are an important source of urban air pollutants. Improving fuel utilization and reducing harmful exhaust emissions are urgent problems to be solved for the new generation of internal combustion engines, but this increases the difficulty of igniting internal combustion engines. Traditional electric spark plugs can no longer meet the needs of higher performance internal combustion engines. Laser-induced spark ignition technology has many advantages, and it has been one of the research hotspots since it was introduced into the ignition of internal combustion engines. Laser-induced spark ignit...

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Problems solved by technology

However, the methods used are to use multiple pump sources to pump the laser crystal at the same time to obtain the output of multiple laser beams. For example, in 2011, Japan used three fiber pigtail output semiconductor lasers to pump the laser gain crystal at the same time. Three nanosecond pulses with high peak power (see "Composite, all-ceramics, high-peak power Nd:YAG / Cr" by Nicolaie Pavel et al. 4+ : YAG monolithic micro-laser with multiple-beam output for engine ignition," "Optics Express" 19 (2011) 9378-9384), the disadvantage of this method is that the laser structure is relatively complicated by using three independent pumping systems, and the Increase the process difficulty and production cost of system production

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