OPTICAL ISOLATOR

Japanese Patent JPH0561000

A

PURPOSE:To eliminate the dependence upon the polarization direction of light by equalizing optical path lengths of branched light beams at the time of emitting them after polarization and synthesis in a birefringence crystal plate. CONSTITUTION:Light is branched into ordinary rays and extraordinary rays by a birefringence crystal plate (B) 11 where the crystal optical axis is inclined to the light beam propagation direction; and since planes of polarization of respective branched light are rotated at 45 deg. after they are transmitted through a Farady rotator (F) 11, the crystal optical axis of a B 12 is rotated at 45 deg. to the (z) axis, and it is so arranged and fixed that extraordinary rays of the B 11 acts as extraordinary rays in a B 12. The crystal optical optical axis in a B 13 is adjusted to the direction of the crystal axis of the B 12 rotated at 90 with the (z) axis as the center, and ordinary rays propagated on the origin ((z) axis) are converted to extraordinary rays and are moved to a prescribed position, and finally, a B 14 is arranged symmetrically to the B 13 with respect to a specular surface and two branched light beams are finally polarized and synthesized. In this case, thickness, directions of crystal optical axes, etc., of birefringence crystal plates are so adjusted that light beams branched by them have the same optical path length finally.

JPS62232614	LASER MODULE
JP2009075302	PROJECTOR

KONNO YOSHIHIRO
KUME HIROSHI
TADENUMA MASATO

JP24667791A

March 12, 1993

August 31, 1991

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NAMIKI PRECISION JEWEL CO LTD

G02B27/28; (IPC1-7): G02B27/28

Next Patent: OPTICAL FIBER DIFFUSION DELAY EQUALIZER