Frequency-selecting 355nm ultraviolet laser in optical fiber end face pumping Brewster angle cavity

Abstract

The invention relates to a frequency-selecting 355nm ultraviolet laser in an optical fiber end face pumping Brewster angle cavity. A 808nm semiconductor laser generates pumping laser, the pumping laser is guided into a coupling head through a 808nm guiding out optical fiber to be focused, the focused 808nm pumping laser enters a plano-convex resonant cavity through a plano-convex front reflecting mirror, YVO4 crystal is stimulated to generate 1064nm laser, the 1064nm laser continuously simulates and oscillates in the plano-convex resonant cavity to generate mixed laser, the mixed laser exits an Brewster angle of third harmonic generation LBO crystal and is divided into light beams of different deflection angles, 355nm laser enters a power attenuator after being filtered by a substrate, the 355nm laser enters a beam expander after the power is adjusted, the 355nm laser is output through an output window after the spot diameter and an divergence angle are adjusted, and non-355nm useless light can enter a useless light recycling station through a deflecting prism. The frequency-selecting 355nm ultraviolet laser is ingenious in structure and reasonable in design, can keep temperatures of all modules in the laser constant and can stabilize the laser output power and the optical quality.

Description

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-wavelength, cold ligh...

AI Technical Summary

Problems solved by technology

Since the 355nm laser can be absorbed by almost all materials including optical devices, it is easy to damage the optical devices; the conversion efficiency of nonlinear crystals is easily affected by temperature changes, resulting in unstable laser power; 532nm, 355nm and other wavelength lasers, if the 355nm wavelength laser output is doped with more other wavelength lasers, the laser processing effect will be poor

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