Crystal prism type beam divergence angle inductor

Abstract

The invention relates to an Iceland spar crystal prism type beam divergence angle inductor and belongs to beam divergence angle measuring devices. The beam-divergence angle inductor satisfying divergence angle measuring of large-aperture beams or small-divergence beams comprises a right-angle prism structure and a prism combination manner. The optical axes of the right-angle prisms 1, 3 and 4 are vertical to a right-angle edge and parallel with an incident end face, the optical axis 2 of the right-angle prism 2 is vertical to the right-angle edge and an emergent end face, the structural angle alpha of the right-angle prism 1 and the right-angle prism 2 ranges from 35 degrees to 40 degrees, the structural angle beta of the right-angle prism 3 and the right-angle prism 4 ranges from 38.5 degrees to 39 degrees, the right-angle prism 1 and the right-angle prism 2 form a beam splitting system through optical bonding, the right-angle prism 3 and the right-angle prism 4 form a deviation detecting interference system of middle air gaps, the two systems are adjusted into optical extinction states, the relative directions of the two systems are fixed, and effective one-direction use is achieved. The beam divergence angle inductor has the advantages that device end face shapes are not regulated, applicable device wave lengths range from 300 nanometers to 3500 nanometers, measurable angles range from 10 seconds to 3 degrees, extinction ration is not smaller than 1*10<-5>, and optical damage preventing threshold is 10W / cm<2>.

Description

Technical field: [0001] The invention relates to a light beam divergence characteristic detection device, in particular to a light beam divergence angle conversion measurement device for Iceland stone crystals. Background technique: [0002] The beam divergence angle is a very important technical parameter in the optical system, which determines how much light energy reaches the set target. In order to effectively exert the laser performance and increase the working distance, it is necessary to control the divergence angle of the laser beam accordingly, which involves the detection of the divergence angle. Divergence angle detection usually adopts focal spot method, aperture method, pinhole scanning method, threshold intensity method, focal plane CCD method, etc. The basic principle is to complete indirectly by measuring the spot size, and the spot contour boundary recognition method affects the test accuracy. A key factor; the divergence angle can also be measured by polar...

AI Technical Summary

Problems solved by technology

Divergence angle detection usually adopts focal spot method, aperture method, pinhole scanning method, threshold intensity method, focal plane CCD method, etc. The basic principle is to complete indirectly by measuring the spot size, and the spot contour boundary recognition method affects the test accuracy. A key factor; the divergence angle can also be measured by polarized light interferometry, BBO crystal frequency doubling method, wedge shearing interferometry, grating Moire fringes and other methods. The basic idea is to use some means to transform the divergence angle parameter of the beam It is another parameter that is more convenient to detect, avoiding excessive dependence on equipment accuracy and experimental conditions, but currently there is a lack of ideal devices that can perform this conversion

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