Folding cavity-dumping electro-optic Q-switch laser resonant cavity

Abstract

The invention discloses an electro-optic Q-switch laser resonant cavity sequentially comprising a first total reflector, laser media, an electro-optic Q-switch crystal and a second total reflector. The electro-optic Q-switch laser resonant cavity is characterized in that a Brewster folding endoscopy is adopted to be arranged between the laser media and the electro-optic Q-switch crystal, and the placed angle thereof leads the S polarized light perpendicular to a plane of incidence to meet the requirement on total reflection. The resonant cavity is provided with less intracavity optical elements, which avoids the damage of optical membranous layers, reduces the insertion loss and shortens the length of the laser resonant cavity.

Description

technical field [0001] The invention belongs to laser technology, in particular to an electro-optic Q-switched laser resonant cavity. Background technique [0002] Electro-optic Q-switching is to use the electro-optic effect of the crystal to realize the adjustment of the Q value of laser oscillation through the change of the polarization direction of the optical field in the laser resonator. It can generate laser pulses with narrow pulse width and high peak power. In order to ensure a good Q-switching effect, polarizing and analyzing components need to be placed in the traditional electro-optical Q-switched resonant cavity. Brewster lenses and Glan prisms are commonly used as polarizers and analyzers for the optical field in the cavity. [0003] Placing polarizing and analyzing Brewster mirrors and Glan prisms in the traditional laser resonant linear cavity will bring some inconvenience and disadvantages: (1) The role of the dielectric film coated by the Brewster mirror i...

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Problems solved by technology

[0003] Placing polarizing and analyzing Brewster mirrors and Glan prisms in the traditional laser resonant linear cavity will bring some inconvenience and disadvantages: (1) The role of the dielectric film coated by the Brewster mirror is mainly to improve The polarization degree of the parallel component of the optical field in the cavity has no obvious anti-reflection effect on the laser wavelength, and the photoresist layer of the Glan prism is easily damaged by light, so it brings a large insertion loss to the resonator

(2) Due to the high light intensity in the electro-optic Q-switched cavity, the dielectric film layer and the photoresist layer are easily damaged, especially for the electro-optic Q-switched laser with cavity emptying method, the unfavorable factors caused by this are more serious

The insertion of polarizing and analyzing Brewster lenses and Glan prisms in the laser resonator greatly limits the improvement of the peak power of the electro-optic Q-switched laser

(3) The Brewster mirror and Glan prism are fixedly installed and adjusted in the cavity. The mirror holder adjustment frame occupies a large space position, which increases the length of the laser resonator cavity, which is not conducive to compressing the laser pulse width of electro-optic Q-switching.

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