Study of sandwiched three-port transmission grating with a connection layer under normal incidence

Li, Hongtao; Wang, Bo

doi:10.1117/1.oe.55.9.097109

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“…Using the double-groove characteristic [17][18][19][20][21], a beam splitter device with directionaloutput diffraction order can be created. Previous researchers have designed a large number of three-port gratings [22][23][24]. Feng et al first proposed a transmission three-port grating under normal incidence [25].…”

Section: Introductionmentioning

confidence: 99%

Double-groove reflection grating for three-channel beam separation at infrared wavelength

Gao¹,

Wang²

2020

Laser Phys.

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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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