Optical reflection grating and method for its optimization...

Details Optical reflection grating and method for its optimization... Optical reflection grating and method for its optimization...

G - Physics

02

B

G02B 5/18 (2006.01)

Patent

CA 2331240

In an optical reflection grating with a multitude of parallel grooves (5), for a ratio of grating period (g) to wavelength (.lambda.) of smaller than 0.9, preferably of smaller than 0.7, the groove depth is chosen so deep that the diffraction efficiencies (DE) for TE and TM waves of a certain wavelength (.lambda.) differ by less than 10%, preferably by less than 5% from one another and are at least 60% respectively. That means, the diffraction efficiency (DE) is practically independent fro m the polarization direction of the incident light and is very high.

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