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US 5,691,989 AGranted
Wavelength stabilized laser sources using feedback from volume holograms
AssigneeAccuwave Corporation
InventorsGeorge Anthony Rakuljic, Amnon Yariv, Victor Leyva, Koichi Sayano, Charles E. Tyler
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Abstract
A laser utilizes feedback from a volume holographic grating used as a wavelength standard to lock the laser output wavelength to its desired value. This feedback can be non-optical, wherein the holographic filter output is used to actively control the wavelength through an external control mechanism. This feedback can also be optical, wherein a volume hologram reflection grating is used to generate optical feedback into the laser gain.
Claims4
A method of stabilizing an optical source's output in a selected wavelength range, comprising the steps of:
- generating a beam of electromagnetic wave energy as the output in the selected wavelength range;
- filtering the beam using a holographic storage device including at least two reflective diffraction gratings having like response characteristics that intersect at a given wavelength in the selected wavelength range, where at least a portion of the beam is directed onto the diffraction gratings to generate reflections therefrom;
- and
- controlling the optical source to alter the beam's wavelength in accordance with relative amplitudes of the reflections from the diffraction gratings.
1 more element
Dependencies are inferred from the claim text.