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Tunable 2-μm optical vortex parametric oscillator
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DOI：10.1364/OE.20.023666.png)
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Abstract
En 中文
We generated tunable 2-mu m optical vortex pulses with a topological charge of 1 or 2 in the wavelength range 1.953-2.158 mu m 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. (C) 2012 Optical Society of America
Keywords:
ORBITAL ANGULAR-MOMENTUM
LIGHT
LASER
GENERATION
VORTICES
SPECTROSCOPY
DYNAMICS
OUTPUT
PULSES
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