https://www.nist.gov/publications/optical-phase-locking-microradian-domain-potential-applications-nasa-spaceborne-optical
Optical Phase Locking in the Microradian Domain: Potential Applications to NASA Spaceborne Optical...
Feb 17, 2017 - We have constructed and demonstrated a high-performance optical phase-locked loop between two cw ND-YAG lasers.
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