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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 28, Iss. 21 — Nov. 1, 1989
  • pp: 4543–4547

Master oscillator with power amplifiers: performance of a two-element cw HF phased laser array

Jay M. Bernard, Richard A. Chodzko, and John G. Coffer  »View Author Affiliations


Applied Optics, Vol. 28, Issue 21, pp. 4543-4547 (1989)
http://dx.doi.org/10.1364/AO.28.004543


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Abstract

The experimental performance of a two-element phased array of multiline cw HF chemical lasers in the master oscillator with power amplifier (MOPA) configuration has been measured. The mutual coherence of the two amplified beams was inferred from measurements of the visibility of interference fringes obtained when the beams were overlapped in the near field. When the optical path difference for the two beams was minimized, multiline visibilities of 0.90 ± 0.02 were measured. White light interferometry was used to equalize the optical path lengths. Spectral mismatch between the master oscillator output and the amplifier's preferred gain distribution affected neither the amplification factor nor the mutual coherence of the amplified beams. The effect of spatial coherence of the master oscillator beam on these near field measurements and the eventual requirement of far field measurements to precisely optimize path lengths are discussed. Spectra data, amplification factors, and mutual coherence measurements are shown, and the resulting phased array far field performance is presented.

© 1989 Optical Society of America

History
Original Manuscript: November 16, 1988
Published: November 1, 1989

Citation
Jay M. Bernard, Richard A. Chodzko, and John G. Coffer, "Master oscillator with power amplifiers: performance of a two-element cw HF phased laser array," Appl. Opt. 28, 4543-4547 (1989)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-28-21-4543


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References

  1. W. R. Warren, “The Parallel Inernal-Master-Oscillator Power Amplifier for Phase Matching the Output Beams of Multiline Lasers,” TR 0078 (9990)-6, The Aerospace Corp., Los Angeles, CA 90009 (1978).
  2. C. P. Wang, “Master and Slave Oscillator Array System for Very Large Multiline Lasers,” Appl. Opt. 17, 83–86 (1978). [CrossRef] [PubMed]
  3. R. W. F. Gross, J. G. Coffer, R. A. Chodzko, E. B. Turner, “Interference Patterns Produced by a Mach Zehnder Interferometer and a Multiline HF Laser,” TR 0080 (5764)-2, The Aerospace Corp., Los Angeles, CA 90009 (1980).
  4. J. G. Coffer, J. M. Bernard, R. A. Chodzko, E. B. Turner, R. W. F. Gross, W. R. Warren, “Experiments with Active Phase Matching of Parallel-Amplified Multiline HF Laser Beams by a Phase-Locked Mach Zehnder Interferometer,” Appl. Opt. 22, 142–148 (1983). [CrossRef] [PubMed]
  5. C. P. Wang, “Frequency Stability of a cw HF Chemical Laser,” J. Appl. Phys. 47, 221–223 (1976). [CrossRef]
  6. D. J. Spencer, H. Mirels, D. A. Durran, “Performance of cw HF Chemical Laser with N2 or He Diluent,” J. Appl. Phys. 43, 1151–1157 (1972). [CrossRef]

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