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Pulse Propagation in a High-Gain Laser Amplifier: Pulse Waveform and Saturation

  • H. Gamo
  • N. Takahashi
  • H. Osada
  • H. Sato
Conference paper

Abstract

The resonant pulse propagation is applied to a high-gain helium xenon 3.5 μm laser amplifier with a partially homogeneously broadened lineshape, with emphasis on the saturation effect and pulse waveform. This problem has been studied in a linear gas laser amplifier for determining the line-shape parameters in the limited case when the spectrum of the incident pulse is narrow enough near and around the line-center frequency of the gain medium.[1] Here, we shall find the formulas of resonant pulse propagation which are applicable to the general case, even if the width of the spectrum is comparable with or greater than the spectral width of the gain medium.[2] Including the saturation, our particular interests are in the formulas of the incremental intensity gain at the pulse peak γI, the increments of the pulse delay time ∂T/∂z, and of the pulse duration ∂τ’/∂z per unit plasma length. Using the experimental results of the value of ∂T/∂z, we shall determine the saturation intensity Is of the gain medium. The value of Is, obtained by applying a quasi-CW treatment to pulse propagation, is compared with the above results.

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References

  1. 1.
    H. Gamo and H. Sato, J. Appl. Phys. 46, 3585 (1975).ADSCrossRefGoogle Scholar
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    H. Gamo and H. Osada, see this Volume, p. 583.Google Scholar
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    H. Sato, Ph.D. Dissertation, University of California, Irvine, Calif., 1975. Unpublished; Appendix C., p. 81.Google Scholar
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    These experimental results are exactly the same as shown in Fig. 8 (a), (b), (c) of Ref. 1.Google Scholar
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    H. Gamo and J.S. Ostrem, J. Opt. Soc. Am. 65, 29 (1975).ADSCrossRefGoogle Scholar
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    A. Icsevgi and W.E. Lamb, Jr., Phys. Rev. 185, 517 (1969).ADSCrossRefMathSciNetGoogle Scholar
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    G.L. Lamb, Jr., see this Volume, p. 747.Google Scholar

Copyright information

© Springer Science+Business Media New York 1978

Authors and Affiliations

  • H. Gamo
    • 1
  • N. Takahashi
    • 1
  • H. Osada
    • 1
  • H. Sato
    • 2
  1. 1.University of CaliforniaIrvineUSA
  2. 2.National Defense AcademyYokosukaJapan

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