Abstract
The generation of high-order Hermite-Gaussian (HG) beams at the Stokes wavelength in a YVO4 /Nd:YVO4 self- Raman laser with off-axis pumping is demonstrated. The high- order vortex beams at the Stokes field are successfully created by transforming these HG modes via an extra-cavity mode converter. The stimulated Raman scattering (SRS) threshold pump power for the diode-end-pumped laser is theoretically analyzed to verify the feasibility of generating high-order HG modes by off-axis pump- ing. At a pump power of 18.6 W, the SRS output powers can be higher than 1.0 W for the HG modes from TEM0 ,0 to TEM3 ,0 . Under the same pump power, the maximum order can be up to TEM 28 ,0 . Index Terms—Optical vortices, Raman scattering, diode pump- ing, Beam transformation.
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More From: IEEE Journal of Selected Topics in Quantum Electronics
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