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US 4,306,763 AGranted
Optical source comprising a semiconductor laser and optical means for the anamorphosis of the beam emitted by said laser
AssigneeThomson-CSF
InventorJean-Pierre Huignard
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Abstract
An optical source comprising a semiconductor laser having an emissive junction and optical means for the anamorphosis of the beam emitted by said laser. The optical means comprise a concave holographic diffraction grating. The location of the recording sources of said grating and of the semiconductor laser and their wavelength are such that said grating makes a stigmatic image of said laser with a good aplanetism. The angle of diffraction is selected so as to reduce the non-isotropy of the beam emitted by the semi-conductor laser.
Claims11
Optical source having an exit pupil, comprising:
- a semiconductor laser having an emissive junction emitting a non-isotropic beam of coherent radiation of wavelength .lambda.;
- and
- optical means for anamorphosing said beam, said optical means comprising a concave holographic diffraction grating arranged along a spherical surface the concavity of which is oriented towards said emissive junction;
- said grating conjugating the center of said emissive junction with a predetermined point C which is the center of said exit pupil, said grating being obtained in a photosensitive layer with first and second recording beams of coherent radiation of wavelength .lambda..sub.0 having spherical wavefronts.
1 more element
Dependencies are inferred from the claim text.