Large-aperture polarization independent high-power isolator

Abstract

The invention relates to the laser field and discloses a large-aperture polarization independent high-power isolator. The large-aperture polarization independent high-power isolator comprises a first birefringent prism, a 45-degree faraday rotator, a second birefringent prism and a beam combiner, all of which are orderly arranged in the forward transmission direction of a light path, wherein the first birefringent prism and the second birefringent prism both are reflective polarizing beam splitting prisms; a half-wave plate is optically cemented on a light transmission surface at the magneto-optical crystal side of the faraday rotator. The birefringent prisms of the reflective polarizing beam splitting prisms are employed to divide light transmitted in the isolator into two beams of polarized light, the polarization directions of the two beams of polarized light are perpendicular to each other and a large separation angle is formed between the two beams of polarized light, and a pair of total-reflection optical elements is employed to further reflect two sub-beams of the returned light so that the two sub-beams are deviated away from the forward transmitted light, and therefore, the large-aperture polarization independent high-power isolator is realized; the half-wave plate is added on the side of the magneto-optical crystal so that the isolation of the isolator is enhanced, and as a result, the high-power isolator is enabled to be more stable and reliable and can be prevented from being burnt out.

Description

technical field [0001] The invention relates to the field of lasers, in particular to a large-diameter polarization-independent high-power isolator. Background technique [0002] In the process of laser transmission, it will pass through many different optical interfaces. At each optical interface, there will be different degrees of reflection. The return light generated by these reflections will eventually travel back to the light source along the optical path. When the cumulative intensity of the return light reaches a certain level, it will cause instability of the light source, frequency drift, amplitude change and other problems, thus affecting the normal operation of the entire laser system. In order to avoid the impact of the return light on the light source, the return light must be suppressed by an optical isolator to ensure the working quality of the laser [0003] In high-power lasers, the optical power density is high, and most of the current isolators are unbea...

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Problems solved by technology

However, in high-power lasers, the isolation is no

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