Patent ID: 7505138

Claim:
An interferometer, comprising: a polarization beam splitter to split a laser beam into a primary leg optical signal within the interferometer and a reference leg optical signal within the interferometer; a partial-reflecting output beam splitter to combine the primary leg optical signal and the reference leg optical signal; a detector to detect interference fringes in the reference leg optical signal caused by combining the primary leg optical signal and the reference leg optical signal, wherein the primary leg optical signal and the reference leg optical signal remain within the interferometer and wherein the partial-reflecting output beam splitter directs a portion of the combined primary leg optical signal and the reference leg optical signal to the detector to detect the interference fringes; a holographic correction device to holographically compensate the reference leg optical signal in response to the detected interference fringes; and an input/output polarizing beam splitter to transmit the reference leg optical signal to the holographic correction device to holographically compensate the reference leg optical signal and to reflect the compensated reference leg optical signal to the partial-reflecting output beam splitter.