Laser attenuator with high multiplying power and continuously adjustable multiplying power

Abstract

In order to meet the technical requirements that the attenuation multiplying power of a high-power / energy laser measuring system on an attenuator is large enough, attenuation is stable, the attenuation is continuously adjustable to a certain extent, and optical axis deviation of the measuring system is not caused in the adjusting process, the invention provides a laser attenuator with high multiplying power and continuously adjustable multiplying power. The laser attenuator comprises an attenuation unit or a plurality of attenuation units connected in series, wherein each attenuation unit comprises four identical Fresnel reflectors of a wedge-shaped structure and two bottom plates; the first Fresnel reflector and the second Fresnel reflector are arranged on the first bottom plate at intervals, and the reflecting faces of the two Fresnel reflectors are opposite and parallel; the third Fresnel reflector and the fourth Fresnel reflector are arranged on the second bottom plate at intervals, and the reflecting faces of the two Fresnel reflectors are opposite and parallel; the first bottom plate and the second bottom plate can rotate around respective rotating shafts; incident angles ofthe laser incident on the Fresnel reflectors 1-4 are equal; and after the laser attenuator is installed in place, the first bottom plate, the optical elements on the first bottom plate, the second bottom plate and the optical elements on the second bottom plate form a mirror image relation.

Description

technical field [0001] The invention belongs to the field of high power / energy laser measurement technology and equipment, and relates to a laser attenuator with large magnification and continuously adjustable magnification. Background technique [0002] In a high-power / energy laser measurement system, the laser energy injected into the measurement system is often on the order of tens of thousands of joules (j), while the energy that the detector (such as a CCD) can respond to is between microjoules (μj) and nanojoules (nj). Therefore, the attenuation of large magnification is a must configuration for measurement. The requirement for attenuation is that the magnification is large enough, the attenuation is stable, and to a certain extent, the attenuation must be continuously adjustable to adapt to the best response range of the detector; at the same time, In the high power / energy measurement system, the optical path must be aligned in the weak light state before the laser is...

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Problems solved by technology

[0003] The Chinese patent document with the application number 200720031746.4 discloses a laser attenuator, which uses two split plate pairs to form an optical hinge, and coats the opposite working surfaces of the two split plates in sections to achieve different light intensities during the overall movement of the optical hinge. The attenuation of the magnification, but this scheme cannot realize the continuous adjustment of the attenuation magnification, and the attenuation magnification still cannot meet the requirements of the current high power / energy laser measurement system

[0004] The Chinese patent document with the application number 201510941066.5 discloses a coded high-magnification laser attenuator. The different gears of the attenuation plate can be switched, and the attenuation magnification code is adjustable, which can achieve a larger magnification attenuation, but still cannot achieve the attenuation magnification. Continuously adjustable, and the attenuation ratio still cannot meet the requirements of current high power / energy laser measurement systems

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