Patent ID: 6643314
Filing Date: 2003-11-04
Classification: H01S

Abstract:
A compound intercavity interferometer for a free-electron laser (FEL), the FEL further comprising a wiggler disposed intermediate a first mirror and a second mirror and aligned substantially about an optical pathway which defines an optical axis, the compound intercavity interferometer comprising:a. an optical non-birefringent crystal coupler positioned at a first predetermined angle with respect to the optical axis, the first predetermined angle being substantially equal to &thgr;INC, the optical non-birefringent crystal coupler adapted to receive light at an input, transmit a first portion of the received light to a first interferometer, and transmit a second portion of the received light to a light output of the optical non-birefringent crystal coupler; and b. an optical birefringent crystal filter adapted to receive the second portion of light transmitted by the optical non-birefringent crystal coupler, the optical birefringent crystal filer positioned at a second predetermined angle with respect to the second portion of light, the second predetermined angle being approximately equal to the Brewster angle, the optical birefringent crystal filter further comprising a first surface and a second surface opposite the first surface, the optical birefringent crystal filter adapted to transmit separate portions of light exiting the optical birefringent crystal filter to at least one of a second interferometer, the second mirror, or a light output.