Absorption type polarizer for polarization in cavity

Abstract

The invention relates to the field of lasers, in particular to a polarizer in the field of lasers and application thereof, and discloses a polarizer and a partial polarizer formed by absorption inconsistency of two polarization directions of a doped anisotropic crystal in a partial spectral range. The polarizer can be applied to the polarization in the cavity of a laser. Compared with the conventional birefringent polarizing prism and other kinds of polarizers, the polarizer has the advantages of small volume, high laser damage threshold value, good heat dissipation performance, easiness for mass production and low cost.

Description

technical field [0001] The invention relates to the laser field, in particular to a polarizer in the laser field and its application. Background technique [0002] The traditional polarizer based on crystal birefringence is to make a beam of linearly polarized light in the crystal undergo total reflection in the polarizing prism when natural light is incident, and only emit a beam of linearly polarized light. For example, the Glan-Thomson prism is made of two calcite right-angle prisms glued together along the inclined plane, and the optical axis orientation is perpendicular to the light-transmitting surface and parallel to each other. When the light is incident perpendicular to the end face of the prism, neither the o-ray nor the e-ray will be deflected, and their incident angle on the inclined plane is equal to the angle θ between the inclined plane of the prism and the right-angled plane. During production, the refractive index of the adhesive should be greater than and ...

AI Technical Summary

Problems solved by technology

Another kind of polarizer is to use PBS film prism or PBS film to form the polarizer. The size of PBS prism is larger. PBS film polarizer generally has a large angle of incident light, so the size is also larger. In addition, it is resistant to laser damage. The ability is limited, and there is also a polarizer made of glass. Its disadvantage is that it is also absorbed, and the high laser power is difficult to bear. At the same time, it is easy to cause changes in the beam quality. The same plastic control polarizer can only be used at low power.

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