Diffraction grating-based wavelength selection unit having improved polarization dependent performance
AssigneeHolotek Ltd.
InventorCharles J. Kramer
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Abstract
An optical wavelength selection device containing an optical beam source, a device for collimating the optical beam to produce a collimated optical beam, a diffraction grating assembly for diffracting the collimated optical beam to produce a collimated optical diffracted beam, a device for modifying the polarization state of the collimated optical beam, and a lens assembly for focusing the collimated optical diffracted beam. The device for modifying the polarization state of the collimated optical beam is located within the diffraction grating assembly in one embodiment and before the diffraction grating assembly in another embodiment.
Claims6
An optical wavelength selection device comprised of an optical beam source, means for collimating said optical beam to produce a collimated optical beam, a diffraction grating assembly for diffracting said collimated optical beam to produce a collimated optical diffracted beam, means for modifying the polarization state of said collimated optical diffracted beam, and means for focusing said collimated optical diffracted beam, wherein said means for modifying the polarization state of said collimated optical diffracted beam is disposed within said diffraction grating assembly, wherein said diffraction grating assembly is comprised a first transmission diffraction grating element, a reflective mirror element disposed behind said first transmission diffraction grating element, and a quarterwave retardation plate disposed between said first transmission diffraction grating element and said reflective mirror element.
Dependencies are inferred from the claim text.