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Excitation of Hypersonic Vibrations by Means of Photoelastic Coupling of High‐Intensity Light Waves to Elastic Waves
1.R. Y. Chiao, C. H. Townes, and B. P. Stoicheff, Phys. Rev. Letters 12, 592 (1964).
2.N. M. Kroll, Phys. Rev. 127, 1207 (1962).
3.For further details, see Appendix A.
4.For a given laser beam and crystal orientation, there are, in general, six distinct solutions of (7), (8), and (9) for each specified direction of each solution having a determined value of and
5.See Appendix A.
6.Constants taken from R. S. Krishnan, Progress in Crystal Physics (Interscience Publishers, Inc., New York, 1958), Vol. I.
7.C. H. Townes, Quantum Electronics (Columbia University Press, New York, 1960), p. 479.
8.I am indebted to Professor Marshall Rosenbluth for a very helpful discussion of this point.
9.This formula has also been given by D. L. Bobroff, Technical Memorandum T‐571, Raytheon Company, Research Division, Waltham, Massachusetts, 6 May 1964. His conclusions with respect to its application are not in entire agreement with those reached in this paper. The instability threshold associated with the large L limit of this formula has been referred to by Chiao et al. (Ref. 2) unfortunately without pointing out the fact that large I. was implied. Actually, their use of a focused beam undoubtedly means that the large L limit does not hold. In addition a parallel beam treatment of the sort presented in this paper can, without further development, have only a qualitative relevance to their results.
10.H. J. Shaw, D. K. Winslow, A. Karp, and R. A. Wilson, Appl. Phys. Letters 4, 28 (1964).
11.That some material damage induced by laser illumination might be due to developed Photoelastic instability was suggested to the author by C. H. Townes. This suggestion was the starting point of this investigation.
12.L. F. Epstein, W. M. A. Anderson, and L. R. Harden, J. Acoust. Soc. Am. 19, 248 (1947), Appendix I.
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