E. A. J. Marcatili, "Modes in a sequence of thick astigmatic lens-like focusers," Bell Syst. Tech. J. 43, 2887–2904 (1964).
H. Kogelnik, "Imaging of optical modes—resonators with internallenses," Bell Syst. Tech. J. 44, 455–494 (1965).
J. A. Arnaud, "Nonorthogonal optical waveguides and resonators," Bell Syst. Tech. J. 49, 2311–2348 (1970).
G. A. Deschamps and P. E. Mast, "Beam tracing and applications," in Proceedings of the Symposium on Quasi-Optics (Polytechnic Press, New York, 1964), Vol. XIV, pp. 379–395.
P. K. Tien, J. P. Gordon, and J. R. Whinnery, "Focusing of a light beam of Gaussian field distribution in continuous and periodic lens-like media," Proc. IEEE 53, 129–136 (1965).
J. A. Arnaud, Beam and Fiber Optics (Academic, New York, 1976).
D. Marcuse, Light Transmission Optics (Van Nostrand Reinhold, New York, 1972).
R. J. Glauber, Quantum Optics and Electronics, Les Houches Lectures 1964, C. DeWitt, A. Blandin, and C. Cohen-Tannoudji, eds. (Gordon and Breach, New York, 1965).
R. J. Klauder and E. C. G. Sudarshan, Fundamentals of Quantum Optics (Benjamin, New York, 1968).
C. Cohen-Tannoudji, C. B. Diu, and F. Laloë, Quantum Mechanics (Wiley, New York, 1977), Vols. I and II.
H. K. Shah, "An investigation in Hamiltonian optical theory of the propagation of coherent state modes in gradient index fibers," D.Sc. Dissertation (The George Washington University, Washington, D.C., May 4, 1980).
W. K. Kahn and H. K. Shah, "Gaussian beam-modes as coherent states," presented at the International Union of Radio Science Symposium, Munich, Germany, August 26–29, 1980.
M. Born and E. Wolf, Principles of Optics (Pergamon, New York,1959).
H. Goldstein, Classical Mechanics 2nd ed. (Addison-Wesley, Reading, Mass., 1980).
P. A. M. Dirac, The Principles of Quantum Mechanics 4th ed. (Oxford at the Clarendon Press, Oxford, England, 1958).
For noncommuting operators X and Y, such that their commutator [X, Y] commutes with both X and Y, we have exp(X + Y) = exp(-1/2[X, Y])eXeY.
N. Marcuvitz, Waveguide Handbook, Vol. 10 of Radiation Laboratory Series (McGraw-Hill, New York, 1951).