Spectrophotometer for measuring spectral transmittance and reflectance of large-aperture optical element

Jun Liu; Haifeng Li; Xu Liu; Peifu Gu

doi:10.1117/12.571857

10 February 2005 Spectrophotometer for measuring spectral transmittance and reflectance of large-aperture optical element

Jun Liu, Haifeng Li, Xu Liu, Peifu Gu

Author Affiliations +

Proceedings Volume 5638, Optical Design and Testing II; (2005) https://doi.org/10.1117/12.571857
Event: Photonics Asia, 2004, Beijing, China

Abstract

It is a difficult task to measure the optical uniformity of an optical coating with very large aperture. Here an automatic near-UV/VIS/NIR spectrophotometer has been developed for spectrum analysis of optical coatings on very large aperture optical elements. It can give two-dimensional scanning result of a sample with substrate surface size of 600mm*350mm and 70mm thickness. The testing beam can be s- or p-polarized, at an incident angle from 0° to 70°. The equipment is composed of optical system, mechanical structure, photo-translating module and computer control system. Because of the light deflection after passing through the very thick sample, an integrating sphere and a sphere moving structure was involved. The measuring beam is guided in a quartz fiber with a special interface that can improve coupling efficiency from the monochromator to fiber. The two-dimensional scanning work platform has the position accuracy about 0.05mm and a reproducibility of 0.01mm. The beam incident angle accuracy is controlled within 0.1°. The measurement results show that in the near-UV/VIS/NIR region, the overall photometric accuracy can get 0.1% and 0.2% for transmittance and reflectance, respectively. The wavelength scale is accurate to be within 0.4nm with a reproducibility of 0.05nm.

Citation Download Citation

Jun Liu, Haifeng Li, Xu Liu, and Peifu Gu "Spectrophotometer for measuring spectral transmittance and reflectance of large-aperture optical element", Proc. SPIE 5638, Optical Design and Testing II, (10 February 2005); https://doi.org/10.1117/12.571857

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