The modes of a ring-laser cavity with an extra mirror for unidirectional operation are analyzed and shown to be the same as those of a conventional ring laser. The beam from the extra mirror does not give rise to additional interferometric effects when it is reflected back into the ring cavity. Experimental results with a He–Ne unidirectional ring laser confirm this finding; operation is demonstrated in both a symmetric and an asymmetric distribution of mode amplitudes about the Doppler line center.
© 1980 Optical Society of America
Original Manuscript: February 21, 1980
Published: July 1, 1980
F. R. Faxvog, "Modes of a unidirectional ring laser," Opt. Lett. 5, 285-287 (1980)