Apparatus and method for testing optical glass homogeneity

Abstract

The invention relates to an optical glass evenness testing device and a test method thereof. The testing device comprises a data acquisition system for an interferometer and a recombined system for a piece of optical glass to be tested, wherein, the interferometer and the data acquisition system consist of a laser, a beam splitter, an extender object lens, an imaging object lens, a CCD camera and an image acquisition processor; the recombined system for the optical glass to be tested comprises a flume; a bearing plate, a granite surface plate, a lifting net and the optical glass to be tested are arranged inside the flume in turn; the flume is provided with an exhaust valve and an injection valve, filled with refractive index matching liquid, communicated with a fluid reservoir which is provided with the refractive index matching liquid through a pipe and the injection valve, and is arranged on a tilt adjustment mechanism which is arranged on a shock-proof platform. The optical glass evenness testing device can directly measure the evenness of the optical glass the surface of which is not preprocessed, is absolute measurement of the refractive index evenness of the optical glass, and can reach the precision of 4x10<-7>.

Description

Technical field [0001] The invention relates to optical glass, in particular to an optical glass uniformity test device and a test method thereof, and is particularly suitable for the uniformity test of large-size and high-precision optical glass materials. Background technique [0002] In recent years, large-energy and high-power laser devices used for laser confinement fusion have developed rapidly, such as NIF in the United States and "Shenguang" in China. These laser devices require a large number of large-size (0.5 to 1m diagonal) flat-type transmission lasers. Optical element. The laser system generally requires 0.25~0.1λ (P-V value) for the transmission wavefront error of this type of optical element. To process such high-precision optical components, on the one hand, the requirements for the optical uniformity of the material are very high, because the thickness of the glass material is 40mm, the local refractive index changes in the order of 10-6, and the distortion caus...

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Problems solved by technology

[0007] Although the above method is an absolute measurement method, it needs to remove the errors introduced by the system through the above four steps. Each measurement needs to obtain interference fringes with a certain accuracy, otherwise the amount of introduced errors will be large

Moreover, the four-step measurement is completed in different time periods, and the error caused by the air disturbance and airflow introduced by the time difference cannot be eliminated.

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