Abstract

When a diverging laser beam passed through a plane parallel glass plate, interference fringes were observed; analysis of these fringes provided accurate estimation of the source wavelength. The fringes had a unique angular range of uniform fringe density. Fourier transform of the fringes in this range directly provided wavelength information. Reference lasers were used to establish a calibration between the fringe density and wavenumber, with which we estimated the wavelength of a test laser. An accuracy of $4.5\times {10}^{-5}$ was obtained, which is better than that of conventional grating spectrometers, while providing a much broader free spectral range. Our method has unique features, such as extreme simplicity of the setup, fast analysis, and low cost, which are great advantages in practical wavelength meter applications.

© 2017 Optical Society of America

Interference of two diverging beams reflected from a plane parallel plate: stationary fringes with characteristic stable period

Hyesun A. Cha, Byoung Joo Kim, Myoungsik Cha, Heejoo Choi, and Dae Wook Kim
Appl. Opt. 59(28) 8568-8574 (2020)

Measurement of thickness profiles of glass plates by analyzing Haidinger fringes

Ju Eun Park, Jiung Kim, and Myoungsik Cha
Appl. Opt. 56(7) 1855-1860 (2017)

Interference patterns generated by a plane-parallel plate

Z. S. Hegedus, Z. Zelenka, and G. Gardner
Appl. Opt. 32(13) 2285-2288 (1993)

Fourier analysis of phase-shifting algorithms for amplitude measurement of interference fringe

Qi Wang
Appl. Opt. 56(15) 4353-4357 (2017)

Influence of Interference Fringes of Equal Inclination on the Reflection of Laser Beams from Plane Parallel Plates

Franz Hillenkamp
Appl. Opt. 8(2) 351-354 (1969)