The Fabry-Perot interferometer for ultraprecise measurement of the thermal coefficient of very low expansion, including its working principle and the construction of its practical system, is described in detail in this paper. The measurement principle is given by the frequency filter character of F-P resonator, and the acoustic frequency shifter is used to modulate the frequency of the laser beam. This F-P interferometer system can be used to measure the thermal coefficients of very low expansion as low as 10^-9 with high accuracy.

Date Published: 5 February 1993
PDF: 5 pages
Proc. SPIE 1755, Interferometry: Techniques and Analysis, (5 February 1993); doi: 10.1117/12.140759

Published in SPIE Proceedings Vol. 1755:
Interferometry: Techniques and Analysis
Gordon M. Brown; Osuk Y. Kwon; Malgorzata Kujawinska; Graeme T. Reid, Editor(s)