High power polarization splitting prism

Abstract

The invention discloses a high power polarization splitting prism comprising a pair of right-angle prisms. The inclined surfaces of the pair of right-angle prisms are fixedly connected with each other, and the inclined surface of one of the right-angle prisms is provided with a polarization splitting film in a coated manner. The pair of right-angle prisms are made of yttrium aluminum garnet crystals, sapphire crystals, diamond crystals, and ZnGe. By adopting the technical scheme, the materials having low laser absorption coefficient and high heat conductivity are adopted to form the polarization splitting prism, and the polarization splitting prism has a low heating characteristics, and at the same time, because of the high heat conductivity, the heat energy in the optical path can be conducted out timely, and the quantity of the refraction and the thickness changed along with the temperature of the polarization splitting film is relatively low, and therefore the extinction ratio of the polarization splitting prism can be guaranteed not to be degraded, and the polarization splitting prism has a relatively high laser damage threshold and a relatively high extinction ratio under thehigh power condition.

Description

technical field [0001] The invention relates to the field of laser optical devices, in particular to a high-power polarization beam splitter prism. Background technique [0002] Polarization beamsplitter prisms are commonly used components in optical devices, and recently polarization beamsplitters are also used in the field of high-power lasers. However, the laser damage threshold of the conventional polarization beam splitter prism is low, and the optical properties of the film are sharply deteriorated due to the heating of the material under high power, which limits its application in the field of high-power lasers. Therefore, in the field of high-power lasers, most of them still use birefringent crystals to achieve polarization splitting, which greatly increases the cost, and the absorption of laser light by birefringent crystals itself also limits their use at higher powers. In order to make the polarization beam splitter prism work at higher laser power, the low laser...

AI Technical Summary

Problems solved by technology

However, the laser damage threshold of conventional polarization beam splitters is low, and the optical properties of the film are sharply deteriorated due to the heating of the material under high power, which limits its application in the field of high-power lasers.

Therefore, in the field of high-power lasers, most of them still use birefringent crystals to achieve polarization splitting, which also greatly increases the cost, and the absorption of laser by the birefringent crystal itself also limits its use at higher power

In order to make the polarization beam splitter prism work at higher laser power, the low laser damage threshold of the polarization beam splitter prism and the decrease of extinction ratio at high power are the problems that must be overcome at present.

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