High-reflectivity high-damage threshold superwide-band fs laser reflector

Abstract

The present invention discloses a high-reflectivity high-damage threshold superwide-band fs laser reflector. On some support or pedestal, there is one rectangular prism with one inclined plane and two right angle planes in the angle of 45 deg to the inclined plane, the inclined plane is optical polished plane and the two right angle planes has anti-reflecting film formed via vacuum vaporizing and coating. Owing to the material and structure, the rectangular prism can transmit fs laser of 200 nm over spectral bandwidth with the transmittance being reaching to 99.5%. The present invention has reasonable design, simple structure, high transmittance, less laser absorption, high laser damage threshold and other advantages. The present invention may be used in various fs laser equipment.

Description

technical field [0001] The invention belongs to the field of laser technology, in particular to an ultra-broadband femtosecond laser reflector with high reflectivity and high damage resistance threshold. Background technique [0002] High peak power femtosecond laser pulses provide an effective means for humans to reveal the microstructure of matter and the rules of ultrafast processes. Especially in recent years, people have used TW-class ultrashort and ultraintense lasers to carry out physical experiments on the interaction with matter targets. , to study the operation law of matter on the atomic scale. For the generation and application of femtosecond laser pulses with high peak power, suitable optical elements are needed to guide the light path, such as reflection, transmission and refraction, among which the most commonly used is reflection light guiding. For femtosecond laser pulses Generally, reflective coatings are coated on optical glass to achieve high reflectivit...

AI Technical Summary

Problems solved by technology

For the generation and application of femtosecond laser pulses with high peak power, suitable optical elements are required to guide the light path, such as reflection, transmission and refraction methods, among which the most commonly used is reflection light guiding. For femtosecond laser pulses Generally, reflective coatings are coated on optical glass to achieve high reflectivity. However, for femtosecond laser pulses, the peak power is high and the spectral bandwidth is very wide. However, the process of coating a reflective coating with a wide band is complicated and the film layer is very thick. High requirements on the coating machine, and it is difficult to achieve a damage threshold against high peak power

[0003] The material of the optical right-angle prism is usually K9 glass or fused silica glass. When the laser is transmitted through the right-angle prism and reaches the inclined surface, if the incident angle is 45°, the optical total reflection can be realized in the 200nm-2200nm band, and their total reflection bandwidths are both Reaching above 2000nm, for ultra-broadband femtosecond lasers, the spectral bandwidth is generally above 200nm. In order to achieve 45°broadband reflection, it is generally necessary to evaporate an ultra-broadband reflective film on optical glass. This ultra-broadband reflective film generally requires zirconia Or the titanium oxide coating is covered with a silicon oxide coating, and the silicon oxide coating is covered with a zirconia or titanium oxide coating, alternately vapor-depositing 50 to 60 layers, and the transmittance is generally up to 95%. When a high-power laser is incident on such a thick When it is on the film layer, it is easy to damage the coating layer due to absorption and film layer defects, and the damage threshold is low

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