A Fizeau wavemeter with single-mode optical fibre coupling

Abstract

An improved Fizeau wavemeter for CW and pulsed laser wavelength measurements was developed, incorporating single-mode optical fibre coupling. The whole optical system is enclosed in an evacuated chamber and the optical fibre acts as a spatial filter, resulting in an improved performance and increased simplicity of alignment and operation. Wavelength measurements have been performed with an accuracy better than 1 part in 10⁶ for CW lasers and 2 parts in 10⁶ for pulsed lasers.