Title :
Compensation of Thermally Induced Distortions in a GGG-Based Cryogenic Faraday Isolator
Author :
Starobor, Alexey V. ; Zheleznov, Dmitry S. ; Palashov, Oleg V.
Author_Institution :
Inst. of Appl. Phys., Nizhny Novgorod, Russia
Abstract :
We describe a cryogenic Faraday isolator with a gadolinium gallium garnet (GGG) crystal used for the first time as a magneto-optic element. Simultaneous compensation of thermally induced depolarization and thermal lensing using FK51 glass is demonstrated theoretically and experimentally. The temperature dependence of the ratio of thermo-optical constants P/Q is measured in the temperature range of 300-80 K for the GGG crystal and FK51 glass. The possibility of using this device at laser powers of ~20 kW is shown.
Keywords :
Faraday effect; compensation; cryogenics; gadolinium compounds; garnets; magneto-optical isolators; optical distortion; optical glass; thermal lensing; FK51 glass; GGG crystal; Gd3Ga5O12; compensation; cryogenic Faraday isolator; gadolinium gallium garnet crystal; magneto-optic element; temperature 300 K to 80 K; thermal lensing; thermally induced depolarization; thermally induced distortions; thermo-optical constants; Crystals; Glass; Laser beams; Lenses; Optical distortion; Optical polarization; Thermal lensing; Cryogenics; magneto-optical devices; optical distortion; optical isolators; optical polarization; thermo-optic effects;
Journal_Title :
Quantum Electronics, IEEE Journal of
DOI :
10.1109/JQE.2012.2204041
