Device for measuring focal length and wavefront distortion of lens

Abstract

The invention relates to a device for measuring the focal length and wavefront distortion of a lens. The device for measuring the focal length and wavefront distortion of the lens comprises a laser, a semi-permeable semi-reflection flat mirror, a plane mirror and a focal length and wavefront distortion control unit. The semi-permeable semi-reflection flat mirror and the plane mirror are sequentially arranged on an emergence optical path of a laser; and the focal length and wavefront distortion control unit is arranged on a reflection optical path which is reflected onto the semi-permeable semi-reflection flat mirror by the plane mirror and then is reflected along the semi-permeable semi-reflection flat mirror. The invention provides the device for measuring the focal length and wavefront distortion of the lens, which has large measurement range, high stability, good repeatability and high confidence degree of a measurement result.

Description

technical field [0001] The invention belongs to the field of optics, and relates to a lens focal length and wavefront distortion measurement device, in particular to an automatic measurement device for laser collimating and focusing lens focal length and wavefront distortion parameters. Background technique [0002] In the large-scale scientific engineering research of Shenguang three host devices, a large number of lenses with different aperture sizes and focal lengths are required for the collimation and focusing of strong lasers and the sampling and diagnosis of their parameters, and the focal length of the lens and the transmission wavefront distortion are directly related. It affects the transmission quality and performance of the laser, so that the required indicators cannot be reached. In order to achieve good transmission quality of the laser, the focal length and wavefront of the transmission lens must be strictly controlled, so the precise measurement of the focal ...

AI Technical Summary

Problems solved by technology

The disadvantage is that when measuring the lens, the spherical aberration of the lens will cause the image to be unclear, which will affect the image interpretation, resulting in a large error in the measurement of the focal length of the lens. In addition, due to the limitation of the focal length of the flat light tube, the measurement range of the focal length of the lens cannot cover the focal length of the lens of Shenguang three hosts. range of needs

Lens wavefront distortion is measured with an interferometer. The disadvantage is that the interferometer can only measure the surface shape of a single surface of the lens and cannot actually measure the transmission wavefront of the lens. This will cause corresponding errors. In addition, the laser wavelength used for interferometer measurement is different from the actual Inconsistent wavelengths can also cause errors

Using the above two devices to measure the focal length and wavefront of the lens will produce large errors, which cannot be corrected in time, which will affect the transmission performance and quality of the laser.

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