Device and method for accurately measuring transmittance of optical lens in high-power laser environment

Abstract

The present invention discloses an optical lens transmittance measuring device which comprises a laser light source, a beam expanding device, a 45-degree optical divider ratio 50 / 50 film coating beam splitter, a compensation piece, a slit, a first power meter and a second power meter. In the measurement, firstly the laser light source is opened, the readings P1 and P2 of the first power meter and the second power meter are recorded, and a power ratio c=P1 / P2 is obtained. Then a lens to be measured is placed in the transmission light path of the optical lens transmittance measurement device, the position and angle of the lens to be measured are adjusted by using the calibration device of the lens to be measured, and the readings P1' and P2' of the first power meter and the second power meter are recorded. Finally, the transmittance T of the lens to be measured is calculated through the following formula T= P2'c / P1'. According to the device and the method, the requirement of light source stability is low, the thickness of the lens to be measured is not required, and the influence of surface reflection before and after light splitting and optical film coating lens film system uniformity on a testing result can be eliminated.

Description

technical field [0001] The invention belongs to the technical field of lasers, in particular to a method and a device for accurately measuring the transmittance of an optical lens in a high-power laser environment. Background technique [0002] The transmittance of an optical lens is an important reference quantity for reflecting the radiant light flux of an optical lens and evaluating the imaging quality, so its measurement is very important. [0003] A lot of research has been done on the measurement of optical lens transmittance, and some progress has been made. In the past, the traditional single-channel measurement method was mostly used, that is, the ratio of the luminous flux obtained by the beam passing through the lens under test to the luminous flux obtained by the beam not passing through the lens under test. The single-channel test method has a simple structure and is easy to operate, but its biggest disadvantage is that this method will cause the radiant flux o...

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Problems solved by technology

[0006] On the other hand, the level of transmittance is not only affected by the optical lens itself (internal air bubbles, dirt, etc.), but also by the uniformity of the film system on the coated lens. It is very likely that the transmittance measured at different positions will be significantly different. Therefore, the transmittance of large-diameter optical lenses cannot be obtained very accurately, which requires the measurement of the large-diameter transmittance of the lens.

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