Novel Nd:YAG single-frequency annular laser resonant cavity

Abstract

The invention provides a novel Nd:YAG single-frequency annular laser resonant cavity. The novel Nd:YAG single-frequency annular laser resonant cavity is sequentially provided with at least one pumpingmodule, a Faraday rotator, a half-wave plate, an F-P etalon, and an output coupling mirror, along an optical path; Nd:YAG crystals are located in the pumping modules; the output coupling mirror is plated with a dielectric film which is relatively high in p polarized light transmissivity and relatively small in s polarized light transmissivity; the resonant cavity is provided with at least two cavity mirrors; at least one cavity mirror is plated with a dielectric film which can totally reflect s polarized light and has relatively high transmissivity for p polarized light; and the residual cavity mirrors are total reflection mirrors. According to the novel Nd:YAG single-frequency annular laser resonant cavity, the s polarized light in the cavity can be forced to operate in a one-way mode; the oscillation of the p polarized light is inhibited to eliminate the space burnout effect in the Nd:YAG crystals; and single-frequency laser output is realized under the effect of mode competition.

Description

technical field [0001] The invention relates to a solid laser resonator, in particular to a novel Nd:YAG single-frequency ring laser resonator. Background technique [0002] High-power single-frequency solid-state lasers are widely used in scientific research and measurement. The unidirectional operation ring laser resonator is the main technical route to realize high-power single-frequency solid-state laser output. At present, the unidirectional operation single-frequency ring laser resonator mainly uses the anisotropic medium Nd:YVO as the laser crystal. Since the Nd:YVO crystal emits linearly polarized light, there is no thermal depolarization loss in the ring laser resonator, and the resonator can output Higher single frequency laser power. According to literature reports, the maximum output power of 1064nm single-frequency laser can reach 101W using Nd:YVO crystal ring laser resonator, and its light conversion efficiency is as high as 40%. As for the most widely used...

AI Technical Summary

Problems solved by technology

As for the most widely used Nd:YAG crystal at present, although the crystal has excellent thermal-optic comprehensive properties, due to the isotropy of the Nd:YAG crystal, when the crystal is pumped with high power, there is a strong thermally induced birefringence effect. , in order to ensure the unidirectional operation of the beam in the cavity, a polarizer must be placed in the cavity, and the depolarized beam emitted by the Nd:YAG crystal will produce a strong depolarization loss on the polarizer, which greatly limits the output power of the laser

According to literature reports, the maximum output power of ring laser resonator single-frequency laser using Nd:YAG crystal is only 31.9W, and its light-to-light conversion efficiency is less than 10%.

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