Chinese Optics Letters, 2005, 3 (0s): 141, Published Online: Mar. 5, 2007
High-efficiency diffraction gratings in fused silica at the wavelength of 632.8 nm
090.2890 Holographic optical elements 050.1950 Diffraction gratings 000.4430 Numerical approximation and analysis
Abstract
We describe high-efficiency diffraction gratings fabricated in fused silica at the wavelength of 632.8 nm by rigorous coupled-wave analysis (RCWA). High-density holographic gratings, if the groove density falls within the range of 1575-1630 lines/mm and the groove depth within the range of 1.1-1.3 microns, can realize high diffraction efficiencies at the wavelength of 632.8 nm, e.g., the first Bragg diffraction efficiency can theoretically achieve more than 93% both in TE- and TM-polarized incidences, which greatly reduces the polarization-dependent losses. Note that with different groove profiles further optimized, the maximum efficiency of more than 99.69% can be achieved for TM-polarized incidence, or 97.81% for TE-polarized incidence.
Yanyan Zhang, Changhe Zhou, Shunquan Wang, Huayi Ru. High-efficiency diffraction gratings in fused silica at the wavelength of 632.8 nm[J]. Chinese Optics Letters, 2005, 3(0s): 141.
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