Single-wavelength emission device
AssigneeThomas-CSF
InventorsChristophe Nicolas, Jean-Pierre Huignard, Frederic Naudan
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Abstract
This device comprises an optical source emitting a single-wavelength light beam. An index grating has been recorded in a holographic device by the interference of two plane light beams, both being beams at a single wavelength with one and the same determined value and being concurrent in the holographic device. The holographic device is illuminated by the light beam and delivers a single-wavelength beam whose radiation pattern has a limited angular passband. The wavelength of the reading beam may be different from that of the recording beams. Its orientation is then different from that of the beams.
Claims10
A single-wavelength emission optical device comprising:
- an optical source emitting a single-wavelength light beam;
- and
- a prerecorded holographic angular filter device receiving said single-wavelength light beam
- whereby the holographic angular filter device effects diffraction, in a first direction, of a first portion of said received light beam as a first planewave beam having a radiation pattern contained in a determined angular band (.DELTA..theta.) and effects transmission, in a second direction, of a second portion of said received light beam as at least one second beam wherein each of said at least one second beam has a radiation pattern located outside said determined angular band
- wherein said device further comprises a reflection device and an energy transfer device whereby said reflection device enables the first and second beams to intersect and said energy transfer device, located in a zone of interference of the two light beams, transfers energy from the second beam to the first beam without any modification of the radiation pattern of said first beam.
Dependencies are inferred from the claim text.