A femtosecond ultraviolet laser

Abstract

The invention discloses a femtosecond ultraviolet laser. The femtosecond ultraviolet laser is composed of an optically connected seed source, a pulse broadener, an optical amplifier, a pulse compression module and a third frequency multiplication module. The seed source is an all-fiber passive mode-locked seed source or a solid mode-locked seed source; The pulse broadener is an all-optical fiber broadener or a spatial light broadener; The optical amplifier is an optically connected multi-stage optical amplifier; The pulse compression module is a prism pair or a grating pair or a chirped volumeBragg grating (CVBG); The frequency tripling module sequentially comprises a 1 / 2 wave plate, a polarization beam splitting prism, a convex lens, a concave lens, a frequency doubling crystal, a frequency tripling crystal, an absorbing block and an ultraviolet window plate. The second harmonic generation crystal is a kind of phase-matched lithium triborate (LBO) crystal, and the third harmonic generation crystal is a kind of phase-matched lithium triborate (LBO) crystal. The back surface of the third harmonic generation crystal is not coated and cuts the Brewster angle Theta B 1 of ultravioletlight, and the front surface of the second harmonic generation crystal is not coated and cuts the Brewster angle Theta B 2 of infrared light. The femtosecond ultraviolet laser realized according to the invention has simple and stable structure, long service life and is suitable for generating high-power femtosecond ultraviolet light.

Description

technical field [0001] The invention belongs to the field of lasers, in particular to a triple frequency femtosecond ultraviolet laser. Background technique [0002] With the upgrading of mobile phones, the demand for OLED displays is increasing, and manufacturers need to increase process utilization and maximize output while increasing production. However, achieving these goals has been challenging due to the complex layered structure of OLED displays and the need for extreme precision in the manufacturing process. At the same time, the two processes of cutting and separating OLED display components are generally carried out on high-value near-finished products, and the processing effect is very important. Femtosecond lasers have proven to be the best tools for such applications. [0003] In the case of OLEDs, almost all materials used (semiconductors and polymers) have good absorption in the ultraviolet spectral range, so the use of ultraviolet light is particularly adva...

AI Technical Summary

Problems solved by technology

However, the Brewster angle will shape the spot, making the output mode of the ultraviolet spot become elliptical, which cannot meet the needs of industrial processing

The common method is to reshape through the coated cylindrical lens group, but this method will also cause the above problems, high-power femtosecond ultraviolet light will quickly damage the coated device, resulting in the laser not working properly

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