It is shown theoretically and experimentally that a Fizeau wedge wavemeter typically used to measure laser wavelength can also be used to measure the linewidth of a pulsed or cw laser. Linewidths as small as a few hundred megahertz can be measured by choosing the thickness of the wedge properly.
© 1988 Optical Society of America
Original Manuscript: June 17, 1988
Manuscript Accepted: August 3, 1988
Published: November 1, 1988
Christopher Reiser, Robert B. Lopert, and Peter Esherick, "Laser-linewidth measurement with a Fizeau wavemeter," Opt. Lett. 13, 981-983 (1988)