We demonstrate a high power (watt-level) self-Raman Nd:GdVO4 Laguerre-Gaussian (LG) mode laser by employing an off-axis needle-pumping geometry. The system selectively produces right-or left-handed LG modes by adjusting the off-axis displacement of the pump beam relative to the laser cavity. The maximum output power of the generated 1173 nm LG beam (corresponding to the first-Stokes emission of from the 882 cm -1 Raman shift) reaches 1.2 W for an absorbed pump power of 8.6 W. Furthermore, the system enables the generation of a wattlevel bottle beam, formed by the coherent superposition of Gaussian and radial LG modes.
We demonstrate the direct generation of watt-level orbital Poincaré sphere (OPS) modes operating at 1.173 μm, corresponding to the first-Stokes emission of the 882 cm-1 Raman shift in Nd:GdVO4 crystal, by employing a tight needle pumping beam with an off-axis pumping geometry. Maximum Laguerre-Gaussian (LG) mode output power of ~1.2 W was achieved, corresponding an optical conversion efficiency of 14.0 %.
We demonstrate, for the first time of the best of our knowledge, the handedness control of a continuous-wave 1173 nm optical vortex output from a self-Raman Nd:GdVO4 laser by employing an off-axis pumping geometry. Maximum vortex output of over 1.2 W was achieved.
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