Published May 1, 1975
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Thermal blooming compensation using coherent optical adaptive techniques (COAT)
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Abstract
Real-time compensation for thermally induced beam distortion has been demonstrated using a phase-adaptive aperture subdivided into 18 elements coupled with an 18-channel multidither servo system. The results were obtained using an argon ion laser and a nonlinear liquid cell placed in the near field of the transmitted beam. The system increased the peak beam irradiance by more than a factor of 4 at the highest power used and reduced the beamwidth by a factor of 5.4 from the uncorrected bloomed case. A comparison with predictions from existing theory is given.
Additional Information
©1975 The American Physical Society. Received 2 January 1975; in final form 28 February 1975. The authors are indebted to W.P. Brown, Jr., N. George, T.R. O'Meara, and J.R. Whinnery for valuable discussions and to F.C. Trimble for his able technical assistance. The COAT system used in these experiments was built with contract support from the Defense Advanced Research Projects Agency monitored through the Rome Air Development Center. Some of the later work (Ref. 8) was accomplished while one of the authors (WBB) was at Caltech as a Sherman Fairchild Distinguished Scholar. The support of Caltech and the Sherman Fairchild Foundation is gratefully acknowledged.Files
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