Phase-compensating system controls relative phase of laser light emitted from two optical fibers. Stabilized for conventional holographic applications, or stepped through sequence of 90 degree phase shifts for phase-stepping holographic interferometry. Closed-loop system compensates for phase fluctuations caused by mechanical stresses and temperature changes in fibers, providing long-term phase stability and phase steps accurate to within 0.02 degrees. Controls environmental fluctuations in phases of light emitted by output fibers.
Phase-Compensating System For Fiber-Optic Holography
NASA Tech Briefs ; 14 , 6
1990-06-01
Sonstige
Keine Angabe
Englisch
Fiber optic holography equipment and theory
SPIE | 1992
|SPIE | 1993
|Compensating Primary Mirror Distortions in Astronomical Telescopes with Real-Time Holography
British Library Conference Proceedings | 1996
|