[2] H. Kogelnik; BSTJ, 44, 455 (1965).
[3] G. A. Deochamps, P. Ε. Mast; in "Proceedings of the Symposium on the Quasi-Optics", p. 379, Polytechnic Press, liew York (1964).
[4] J. Steffen，J. P. Dortscher, G. Herziger; IEEE J. Quant. Electr., QE-8, 239 (1972).
[6] В. В. Cbesler, D. Maydan; J. Appl. Phys., 43， 2254 (1972).
[8] J. Ε. Geusic et al., Appl. Phys. Lett., 12, 306 (1968).
[9] W. Culshaw, J. Kannelaud, J. E. Peterson; IEEE J. Quant. Electr., QE-10, 253 (1974).
[10] J. D. Barry; IEEE J. Quant. Electr., QE-12, 254 (1976).
[11] Б. Б. Бойко и др.; ЖПС, 19，808(1973).
