Optical: systems and elements – Diffraction – From grating
Reexamination Certificate
2005-05-31
2005-05-31
Juba, Jr., John (Department: 2872)
Optical: systems and elements
Diffraction
From grating
C359S566000, C398S084000, C356S328000, C250S23700G
Reexamination Certificate
active
06900939
ABSTRACT:
A beam splitting element having a diffraction grating is designed by careful selection of device parameters such as grating period, duty cycle, depth and refractive index. In particular, the parameters are selected in such a way that the product of refractive index, depth and duty cycle is equal to or bigger than a predetermined value. The diffraction grating device designed by these rules exhibits a high diffraction efficiency and small polarization dependence.
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Hoshi Hikaru
Kaneda Yasushi
Canon Kabushiki Kaisha
Jr. John Juba
Morgan & Finnegan L.L.P.
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