For the coherent optical recombination of high power HF chemical laser beams such as master and slave oscillator array (MASOA) or coherent optical adaptive technique (COAT), a wide bandwidth servo system is required to control the phases of the laser beams. A phase-control servo system using a rate feedback and a laser Doppler sensor was designed. Its performance was simulated on a CDC7600 computer. Laser frequency drift was modeled by a Gaussian Markov random process and the mechanical response of the PZT mirror-driver was modeled by a transfer function. The result indicated that a rms steady-state phase error of less than 3 deg. can be achieved. More detailed discussion on the servo system design and simulation will be given.
C. P. Wang,
P. L. Smith,
"Servo System For Phase Control Of HF Chemical Lasers", Proc. SPIE 0179, Adaptive Optical Components II, (11 July 1979); doi: 10.1117/12.957302; https://doi.org/10.1117/12.957302