We demonstrate stable operation of a diode-pumped cw Raman ring laser in diatomic hydrogen gas. Doppler-induced asymmetry between the the forward and the backward Raman gains leads to inherent unidirectional operation in the forward direction without intracavity optical elements. Use of the ring-cavity geometry dilutes the deleterious effects of thermal lensing and significantly reduces optical feedback to the pump laser.
© 2003 Optical Society of America
Original Manuscript: February 15, 2003
Revised Manuscript: June 19, 2003
Published: September 20, 2003
Peter A. Roos, Lei S. Meng, and John L. Carlsten, "Doppler-induced unidirectional operation of a continuous-wave Raman ring laser in H2," Appl. Opt. 42, 5517-5521 (2003)