The effect of dispersive elements, such as intracavity étalons and multipass interferometric output couplers, on the mode separation of a resonator has been studied. We demonstrate, both theoretically and experimentally in a TEA CO2 laser, that the separation of the two adjacent longitudinal modes closest to the interferometer reflection peak is strongly reduced when a high-finesse interferometer is used as an output coupler. This effect must be taken into account in the design of single-mode lasers.
© 1986 Optical Society of America
Original Manuscript: November 8, 1985
Manuscript Accepted: January 31, 1986
Published: April 1, 1986
G. Giuliani, G. Salvetti, and E. Palange, "Observation of strong frequency pulling in resonators employing multipass interferometric output couplers," Opt. Lett. 11, 207-209 (1986)