Optics: measuring and testing – By polarized light examination
Patent
1980-06-19
1982-10-05
Corbin, John K.
Optics: measuring and testing
By polarized light examination
350 362, G01N 2140
Patent
active
043525660
ABSTRACT:
An apparatus utilizing four-wave degenerate mixing detects birefringence in irregularly shaped objects (6). Laser radiation (120) having a specified polarization is brought to a focus and then sent through the irregularly shaped object. The emerging radiation impinges upon a nonlinear material (8) to form a conjugate beam by means of four-wave degenerate mixing. The conjugate beam, which passes back through the object, is picked off and detected at a replica of the focus point. The detector (10, 11 and 12) includes a polarization detector (10) which is arranged so that a signal is detected only when the object has birefringence.
REFERENCES:
patent: 4145671 (1979-03-01), Hellwarth
patent: 4284324 (1981-08-01), Huignard et al.
patent: 4304458 (1981-12-01), Huignard et al.
Hellwarth, R. W., "Generation of Time-Reversed Wave Fronts by Nonlinear Refraction", JOSA, vol. 67, No. 1, Jan. 77, pp. 1-3.
Yariv, A. et al., "Amplified Reflection, Phase Conjugation, and Oscillation in Degenerate Four-Wave Mixing", Optics Letters, vol. 1, No. 1, Jul. 1977, pp. 16-18.
Bloom et al., "Conjugate Wave-Front Generation and Image Reconstruction by Four-Wave Mixing", App. Phys. Letters, vol. 31, No. 9, pp. 592-594.
Martin, G. et al., "Generation of a Time-Reversed Replica of a Non-uniformly Polarized Image-Bearing Optical Beam", Optics Letters, May 1980, pp. 185-187.
Jensen et al., "Observation of the Time-Reversed Replica of a Monochromatic Optical Wave", App. Phys. Lett., vol. 32, No. 3, Feb. 1978, pp. 166-168.
Bjorklund Gary C.
Bloom David M.
Liao Paul F.
Arnold Bruce Y.
Bell Telephone Laboratories Incorporated
Corbin John K.
Einschlag Michael B.
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