1980-06-03
1983-02-15
Arnold, Bruce Y.
350172, G02B 528, G02B 2710
Patent
active
043737820
ABSTRACT:
A thin film optical filter having a bandpass reflectance characteristic with one of the transition wavelength edges thereof being non-polarizing for radiation incident at a preselected non-normal angle. The filter comprises a transparent substrate and a multilayer thin film optical coating provided on one surface thereof. The optical coating includes a preselected number of alternate layers of a first higher refractive index dielectric material and a second lower refractive index dielectric material arranged as a sequence of dielectric multilayer stacks with intervening spacer layers formed of one of the dielectric materials. The optical thickness of the spacer layers is detuned from half-wave optical thickness to shift either the low wavelength transition edges or the high wavelength transition edges for the separate bandpass response characteristics for the two principal polarization planes substantially into alignment with each other. Various other dielectric stack designs utilizing detuned layers to accomplish the same alignment of wavelength transition edges are described. Simplex and duplex fiber optic communications systems utilizing non-polarizing edge filters of the thin film type are also disclosed.
REFERENCES:
Thelen, A. J., "Non-Polarizing Interference Films Inside a Glass Cube," Applied Optics, vol. 15, No. 12, Dec. 1976, pp. 2983-2985.
Thelen, A. J., "Avoidance or Enhancement of Polarization in Multilayers", Journal of the Optical Society of America, vol. 70, No. 1, Jan. 1980, pp. 118-121.
Baumeister, P. W., "Design of Multilayer Filters by Successive Approximations", Journal of the Optical Society of America, vol. 48, pp. 955-958 (1958).
Thelen, A. J. "Equivalent Layers in Multilayer Filters," Journal of the Optical Society of America, vol. 56, pp. 1533-1538 (1966).
Seeley, J. S., "Resolving Power of Multilayer Filters," Journal of the Optical Society of America, vol. 54, pp. 342-346 (1964).
Arnold Bruce Y.
Optical Coating Laboratory, Inc.
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