Open AccessPropagation of linearly polarized Gaussian beam through the compound modulated diffraction grating
Author(s) -
Jianlong Li,
Lyu Bai-Da
Publication year - 2008
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.57.1656
Subject(s) - grating , optics , ultrasonic grating , holographic grating , blazed grating , diffraction , electromagnetically induced grating , materials science , diffraction efficiency , diffraction grating , wavelength , beam (structure) , holography , physics
A new type of diffraction grating called the compound modulated diffraction grating is proposed, which incorporates both surface relief and periodic refractive index modulation. Based on the angular spectrum representation and strict modal theory, the propagation of linearly polarized Gaussian beam through the compound-modulated diffraction grating whose characteristic size is comparable with the wavelength is studied. It is shown that the propagation of beam in each layer is different and the intensity fluctuation frequency in the compound-modulated grating is smaller than that in the conventional relief grating at the same transmission depth. Using the compound modulated grating model, the influence of surface fluctuation of the sub-wavelength_volume phase holographic grating and waist width of the incident beam on the diffraction efficiency is analyzed.