A laser attenuator with large magnification and continuously adjustable magnification

Abstract

In order to meet the technical requirements of the high power / energy laser measurement system that the attenuator's attenuation magnification is large enough, the attenuation is stable, and can be adjusted continuously to a certain extent, and the optical axis of the measurement system will not be shifted during the adjustment process, the present invention proposes a Large magnification and magnification continuously adjustable laser attenuator, including one attenuation unit or multiple attenuation units in series; a single attenuation unit includes four identical wedge-shaped Fresnel reflectors and two base plates; one Fresnel reflector 1. The second interval is set on the base plate 1, and the reflection surfaces of the two are opposite and parallel; the third and fourth Fresnel reflectors are arranged on the base plate 2, and the two reflection surfaces are opposite and parallel; the base plates 1 and 2 can rotate around their respective rotation axes; The incidence angles of the laser light incident on the Fresnel reflectors 1 to 4 are all equal; after being installed in place, the optical elements on the base plate 1 and the base plate 2 and the optical elements on the base plate form a mirror image relationship.

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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