The frequency shift of the light owing to a cavity length modulation has been observed with the spectroscopy of the 1S–3S two-photon transition in hydrogen. The excitation of this transition occurs at a wavelength of 205 nm. One produces this radiation by frequency doubling a 410-nm radiation in an enhancement ring cavity. The length modulation of this cavity induces frequency shifts and a splitting of the observed 1S–3S line. We obtain a good agreement between the experiment and the theoretical analysis.
© 2002 Optical Society of America
(120.2230) Instrumentation, measurement, and metrology : Fabry-Perot
(120.3940) Instrumentation, measurement, and metrology : Metrology
(300.3700) Spectroscopy : Linewidth
(300.6320) Spectroscopy : Spectroscopy, high-resolution
(300.6410) Spectroscopy : Spectroscopy, multiphoton
Gaëtan Hagel, François Nez, and Fraçois Biraben, "Analysis and observation, on an atomic resonance, of the frequency shift due to the length modulation of an optical cavity," Appl. Opt. 41, 7702-7706 (2002)