Open AccessExperimental study of the free spectral range (FSR) in FPI with a small plate gap
Author(s) -
Min Xiang,
Yan Cai,
Yanrui Wu,
Jian Yang,
Yunlai Wang
Publication year - 2003
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.11.003147
Subject(s) - finesse , free spectral range , optics , fabry–pérot interferometer , materials science , wafer , dispersion (optics) , transfer matrix method (optics) , interferometry , optoelectronics , resonator , wavelength , physics
In this paper we investigate the variation of free spectral range (FSR) for the Fabry-Perot interferometer (FPI) consisting of mirrors with phase shift dispersion. The reflection phase shift on a mirror has been calculated employing the Transfer-Matrix Method and the values of FSR have been calculated under the condition of normal incidence of light beam. Fabry-Perot (FP) cavities have been fabricated employing bulk micromachining technology, and silicon wafers coated with multiplayer dielectric films were used as mirrors. FSR of these FP cavities have been experimentally measured. The experimental data match the calculated results very well. The conclusion is that FSR shortening effect must be taken into account for the FPIs with a small plate gap, as the finesse and the tunable range of tunable FPI can be affected by the shortening effect greatly.