A terbium gallium garnet (TGG) ceramic Faraday rotator (FR) with an isolation ratio of 33 dB was demonstrated at a laser radiation power of 257 W. This FR can be equipped with a large optical aperture by using ceramics technology to prevent laser damage at high-energy pulse operation. The thermal lens of a 257 W laser with a beam diameter of 2.6 mm had a focal length of 9.5 m, which is easily corrected using a spherical lens to suppress the undesirable effects of thermal lensing. The rotation angle of the FR was stabilized by water cooling. The results indicate that the TGG-ceramic-based FR is suitable for high-energy laser systems with high repetition rates.
© 2014 Optical Society of America
Original Manuscript: October 22, 2013
Revised Manuscript: December 20, 2013
Manuscript Accepted: January 18, 2014
Published: February 20, 2014
Ryo Yasuhara, Ilya Snetkov, Alexey Starobor, Dmitry Zheleznov, Oleg Palashov, Efim Khazanov, Hoshiteru Nozawa, and Takagimi Yanagitani, "Terbium gallium garnet ceramic Faraday rotator for high-power laser application," Opt. Lett. 39, 1145-1148 (2014)