Diffraction grating
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United States of America Patent
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Issued Date -
Mar 9, 2006
app pub date -
Sep 6, 2005
filing date -
Sep 3, 2004
priority date (Note) -
Abandoned
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Abstract
A diffraction grating for generating radially polarized laser radiation within a laser resonator is designed as a periodic or quasi-periodic, concentric or spiral grating with a grating period larger than the laser wavelength. The grating period and shape are selected in such a manner that the TM reflectance of the diffraction grating in a diffraction order corresponding to the laser wavelength is larger than the TE reflectivity of the diffraction grating in that diffraction order.
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