AI Article Synopsis
- The incident beam's size significantly impacts the filtering abilities of volume holographic gratings, leading to deviations from expected responses.
- As the beam narrows, phenomena like wavelength selectivity and diffracted profiles change, which are explored through experiments.
- Numerical simulations support these findings by showing that variations in spatial harmonics are key to understanding these effects, particularly near the 1550 nm wavelength.
Article Abstract
The finite dimension of the incident beam used to read out volume holographic gratings has interesting effects on their filtering properties. As the readout beam gets narrower, there is more deviation from the ideal response predicted for monochromatic plane waves. In this paper we experimentally explore beam-width-dependent phenomena such as wavelength selectivities, angular selectivities, and diffracted beam profiles. Volume gratings in both reflection and transmission geometries are investigated near 1550 nm. Numerical simulations utilizing the technique of Fourier decomposition provide a satisfactory explanation and confirm that the spread of spatial harmonics is the main contributing factor.
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| http://dx.doi.org/10.1364/ao.45.003774 | DOI Listing |
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