Optics: measuring and testing – By polarized light examination – With birefringent element
Patent
1987-10-13
1989-07-11
Willis, Davis L.
Optics: measuring and testing
By polarized light examination
With birefringent element
356153, G01B 902
Patent
active
048465755
ABSTRACT:
Monitoring alignment of an element(s) is accomplished with a source of radiation (11), an alignment reflecting assembly (12) embedded within or attached to an element (13) whose alignment is to be monitored and a detection assembly (14). Alignment reflecting assembly (12) includes a conventional mirror (16) that reflects a portion of the incident radiation (E) at a reflection angle that is substantially equal in magnitude and opposite in sign to that of the angle at which the incident radiation is incident thereupon. Alignment reflecting assembly (12) also includes a phase conjugate mirror (18) that reflects incident radiation (E) at a reflection angle that is substantially equal in magnitude and sign to that of the angle at which the incident radiation is incident thereupon, i.e., along the path of the incident radiation. The alignment orientation of alignment reflecting assembly (12) and element (13) is determined by monitoring the so-called retro-reflected radiation from the phase conjugate mirror (18) and the reflected radiation from the conventional mirror (16).
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V. V. Shkunov and B. Y. Zel'dovich, Optical Phase Conjugation, Scientific American, pp. 54-59 (Dec. 1985).
D. M. Pepper, Applications of Optical Phase Conjugation, Scientific American, pp. 74-83 (Jan. 1986).
I. Lindsay and J. C. Dainty, Partial Cancellation of Specular Refraction in the Presence of a Phase-Conjugate Mirror, Optics Communications, vol. 59, No. 5, 6, pp. 405-410 (1 Oct. 1986).
Eastman Kodak Company
Kaufman Stephen C.
Koren Matthew W.
Willis Davis L.
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