Abstract
Double-groove reflection gratings are proposed for three-channel beam separation under two polarizations at infrared laser wavelength. The double-groove grating profiles are analyzed by use of the finite element method. Incident laser light is reflected into the 0th and ±2nd orders equally for both TE and TM polarizations, which has the merit of polarization independence. The total diffraction efficiencies of three orders are more than 95% for each of two polarizations. Compared with the reported single-groove three-port grating, the double-groove grating has a wide incident bandwidth and a large tolerance of grating period. The presented reflection grating for three-channel beam separation should be a useful optical device at infrared wavelength in practical applications.
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