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Phase control for coherent recombination of amplified multiline laser beams

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Abstract

This paper presents experimental results of the evaluation of a phase control system for coherent recombination of amplified and unamplified multiline HF laser beams. Two requirements for coherent recombination of multiline laser beams are automatic acquisition of zero OPD from multiple wavelength errors and tracking of phase disturbances to maintain zero OPD. The control system must make an unambiguous measurement of OPD over a range of many wavelengths to attain the global intensity maximum at zero OPD, which is characteristic of multiline interference. Once the global maximum is attained, the controller must have adequate gain and bandwidth to correct for phase disturbances. With HF lasers, the detection and tracking of phase disturbances are complicated by large fluctuations in the powers of individual spectral lines.

© 1981 Optical Society of America

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