Patent ID: 6018411
Filing Date: 2000-01-25
Classification: G02F

Abstract:
An optical device comprising:a reflector for reflecting an input beam as a reflected beam;a magneto-optical crystal provided so as to pass said input and reflected beams;a first means for applying a magnetic field to said magneto-optical crystal; anda second means for varying said magnetic field in accordance with a control signal, whereinsaid first means comprises a first magnet for applying a first magnetic field to said magneto-optical crystal in a first direction and a second magnet for applying a second magnetic field to said magneto-optical crystal in a second direction different from said first direction, and strengths of said first and second magnetic fields are set at such values that magnetization of said magneto-optical crystal is saturated, andeach of said input and reflected beams is Faraday rotated by said magneto-optical crystal in one direction.