Faraday isolator based on a TSAG single crystal with compensation of thermally induced depolarization inside magnetic field

• Thermally induced effects in a new magneto-active material TSAG were measured.
• Thermo-optic constants of the material were estimated at the first time.
• First TSAG based Faraday isolator with depolarization compensation was demonstrated.

A Faraday isolator based on a terbium scandium aluminum garnet (TSAG) single crystal with compensation of thermally induced depolarization inside magnetic field was demonstrated. An isolation ratio of 32 dB at 350 W cw laser radiation power was achieved. Thermally induced depolarization and thermal lens were studied and compared with similar thermal effects arising in the widely used terbium gallium garnet crystal (TGG) for the first time.