Because of the influence of OH groups in phosphate glasses on the radiation of rare-earth ions, the laser performance is degraded. The laser efficiency and the small signal gain experiment of several phosphate glass samples have been done, the concentration of OH groups in glasses was calculated from the measured absorption coefficient at 3.47 ?m. It is shown that the concentration of OH groups in phosphate glasses can seriously influence the laser output characteristics, and the OH groups have worse influence on the laser amplifier than laser oscillator.
© 2005 Chinese Optics Letters
(140.3380) Lasers and laser optics : Laser materials
(140.3460) Lasers and laser optics : Lasers
(140.3530) Lasers and laser optics : Lasers, neodymium
(160.2750) Materials : Glass and other amorphous materials
Shunguang Li, Guosong Huang, Lei Wen, and Gangfeng Yang, "The influence of OH groups on laser performance in phosphate glasses," Chin. Opt. Lett. 3, 222-224 (2005)