21 February 2011 Multiple-wavelength synthetic green laser source for speckle reduction
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We demonstrate a frequency-converted green laser source simultaneously emitting three spectral lines with nearly equal intensity and ~ 0.5 nm separation, enabling a factor of √3 reduction of speckle contrast in pico-projector applications. The source consists of an external cavity 1060 nm diode laser pump with dual-wavelength reflection provided by a volume Bragg grating and a quasi-periodically poled MgO-doped lithium niobate waveguide engineered to phase-match multiple-wavelength frequency conversion. 62 mW output power and 33% conversion efficiency are demonstrated.
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Dmitri V. Kuksenkov, Rostislav V. Roussev, Shenping Li, William A. Wood, Christopher M. Lynn, "Multiple-wavelength synthetic green laser source for speckle reduction", Proc. SPIE 7917, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications X, 79170B (21 February 2011); doi: 10.1117/12.887545; https://doi.org/10.1117/12.887545

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