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  • Title: Tunable 2-μm optical vortex parametric oscillator.
    Author: Yusufu T, Tokizane Y, Yamada M, Miyamoto K, Omatsu T.
    Journal: Opt Express; 2012 Oct 08; 20(21):23666-75. PubMed ID: 23188332.
    Abstract:
    We generated tunable 2-μm optical vortex pulses with a topological charge of 1 or 2 in the wavelength range 1.953-2.158 μm by realizing anisotropic transfer of the topological charge from the pump beam to the signal output in a vortex-pumped half-symmetric optical parametric oscillator. A maximum vortex output energy of 2.1 mJ was obtained at a pump energy of 22.8 mJ, which corresponds to a slope efficiency of 15%. The topological charges of the signal and idler output were investigated using a shearing interferometric technique employing a low-spatial-frequency transmission grating.
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