We have constructed and demonstrated a high-performance optical phase-locked loop between two cw Nd:YAG lasers. The feedback system is relatively simple, employing only the laser’s internal piezoelectric transducer and an external acousto-optic modulator. A residual phase noise of the order of 1µrad between two optical fields is achieved in the locked condition, as is verified by time- and frequency-domain analyses by the two-oscillator approach that is conventionally used in rf measurement. Potential applications to NASA space-based optical measurements are discussed.
© 1999 Optical Society of America
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(140.3530) Lasers and laser optics : Lasers, neodymium
(350.5030) Other areas of optics : Phase
Jun Ye and John L. Hall, "Optical phase locking in the microradian domain: potential applications to NASA spaceborne optical measurements," Opt. Lett. 24, 1838-1840 (1999)