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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

Measurement Method for Optical Constants of Semitransparent Solid Material under Cryogenic condition

Shengduo Xu
School of Energy Science and Engineering, Harbin Institute of Technology, 92 West Dazhi Street, Harbin 15001, China

Xing Huang
School of Energy Science and Engineering, Harbin Institute of Technology, 92 West Dazhi Street, Harbin 15001, China

Yong Shuai
School of Energy Science and Engineering, Harbin Institute of Technology, 92, West Dazhi Street, Harbin, 150001, P. R. China

Heping Tan
School of Energy Science and Engineering, Harbin Institute of Technology, 92, West Dazhi Street, Harbin, 150001, P. R. China

Abstract

The objective of the present work is to experimentally determine the spectral optical constants of semitransparent solid materials, such as quartz, under cryogenic conditions based on the double-thickness transmittance method. We build a measurement system based on dual optical paths method which dramatically reduces the effect of the unstability of the laser generator and some other measurement errors. To create stable cryogenic environments for the measurements, an optical cryostat and a turbomolecular pump are put into use. The turbomolecular pump produces a vacuum condition for the vacuum chamber of the cryostat which cools the specimen within the vacuum chamber even down to 10K by liquid helium. Glan-Taylor polarizer is utilized to polarize the laser beam into transverse electric wave and transverse magnetic wave. Adjustment of the optical path, thus is applied according to the polarization characteristics. We manage to assure the normal incidence of the electromagnetic waves upon the surface of the specimen. We used quartz both as specimen and as windows and experiments have been done for wavelengths of 405nm, 532nm and 1064nm at temperature ranging from 30K to 300K. Finally, data attained from the National Institute Metrology and calculated from dispersion relation deduced by Malitson are regarded as reference data and compared to the results obtained by ourselves.

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