Optical: systems and elements – Diffraction – From grating
Patent
1992-12-23
1994-11-08
Ben, Loha
Optical: systems and elements
Diffraction
From grating
359569, 359572, 385 10, G02B 518, G02F 1295
Patent
active
053632397
ABSTRACT:
A method for forming a grating in a photosensitive medium such as a photosensitive optical fiber. The method comprises impinging a pair of interfering, actinic beams onto the medium, and during the impinging step, advancing the illuminated portion of the interference pattern relative to the medium. The advancement is carded out without changing the phase, or registration, of the interference pattern. According to one embodiment of the invention, a grating having a spatially dependent period is produced by varying the wavelength or the intersection angle of the actinic beams during the advancement. According to a second embodiment of the invention, a grating having a spatially dependent refractive index perturbation is produced by varying the dose of actinic radiation received by the medium during the advancement.
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Mizrahi Victor
Mollenauer Linn F.
AT&T Bell Laboratories
Ben Loha
Finston Martin I.
Jr. John Juba
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