Frequency-selective 355nm UV laser in a fiber end-pumped Brewster's angle cavity

Abstract

The invention relates to a frequency-selective 355nm ultraviolet laser in a Brewster angle cavity pumped by an optical fiber end face. The 808nm semiconductor laser generates the pump laser and focuses it into the coupling head through the 808nm export fiber; the focused 808nm pump laser enters the plano-convex resonator through the plano-convex front mirror; excites the YVO4 crystal to generate 1064nm laser; the 1064nm laser is in the plano-convex resonator Continuously excited and oscillated inside to generate a mixed laser, the mixed laser is emitted from the Brewster angle of the triple frequency LBO crystal, and is divided into beams with different deflection angles, among which the 355nm laser enters the power attenuator after being filtered by the substrate, and enters the expansion Beam mirror, after adjusting the spot diameter and divergence angle, output through the output window mirror. The non-355nm garbage light enters the garbage light recycling bin through the turning prism. The invention has ingenious structure and reasonable design, can keep the temperature of each module inside the laser constant, and stabilize the output power and optical quality of the laser.

Description

technical field technical field [0001] The invention relates to an ultraviolet laser, in particular to a frequency-selective 355nm ultraviolet laser in a Brewster angle cavity pumped by an optical fiber end face, and belongs to the technical field of ultraviolet light generating devices. Background technique [0002] Laser is one of the major inventions in modern science and technology. Among them, the application value of 355nm ultraviolet laser in non-metal and precision processing is particularly prominent. The global demand for high-quality cold light source lasers is increasing, and the application fields are expanding. Obtaining an ultraviolet laser with excellent beam quality, single frequency, and long-term stable operation is of great significance to the precision processing industry and non-metal processing industry. Starting from the development of the laser industry and economic benefits, it is also the general trend. [0003] Ultraviolet laser is a short-wav...

AI Technical Summary

Problems solved by technology

Since 355nm laser can be absorbed by almost all materials including optical devices, it is easy to damage optical devices; the conversion efficiency of nonlinear crystals is easily affected by temperature changes, resulting in unstable laser power; in addition, there are 808nm and 1064nm in the entire laser optical path 532nm, 355nm and other wavelength lasers, if the 355nm wavelength laser output is doped with more other wavelength lasers, the laser processing effect will not be good

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