AI Article Synopsis
- A method for reducing speckle using Barker codes and M-sequence code diffractive optical elements (DOEs) is explored, focusing on how the speckle contrast varies with laser wavelength.
- The research reveals that a single DOE can effectively suppress speckle across multiple laser colors (red, green, blue) due to a broad maximum in speckle contrast at optimal wavelengths.
- A practical optical setup is proposed that employs a 1D Barker code DOE alongside a 1D liquid-crystal panel, allowing for effective phase rotation without the need for rapid liquid-crystal switching or precise DOE movement.
Article Abstract
A method for speckle suppression based on Barker code and M-sequence code diffractive optical elements (DOEs) is analyzed. An analytical formula for the dependence of speckle contrast on the wavelength of the laser illumination is derived. It is shown that speckle contrast has a wide maximum around the optimal wavelength that makes it possible to obtain large speckle suppression by using only one DOE for red, green, and blue laser illumination. Optical schemes for implementing this method are analyzed. It is shown that the method can use a simple liquid-crystal panel for phase rotation instead of a moving DOE; however, this approach requires a high frequency of liquid-crystal switching. A simple optical scheme is proposed using a 1D Barker code DOE and a simple 1D liquid-crystal panel, which does not require a high frequency of liquid-crystal switching or high-accuracy DOE movement.
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| http://dx.doi.org/10.1364/JOSAA.30.001760 | DOI Listing |
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