Watt-Level 1173 nm Laguerre-Gaussian Mode Generation From a Self-Raman Nd:GdVO₄ Laser

Abstract

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.

Continuous-Wave Self-Raman Vanadate Lasers Generating Versatile Visible Wavelengths

“…Nowadays, the most popular gain media for intracavity SRS are tungstate crystals [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] such as BaWO 4 , SrWO 4 , KGd(WO 4 ) 2 , and vanadate crystals such as GdVO 4 [36][37][38][39][40][41][42][43][44][45][46][47][48], YVO 4 , and LuVO 4 [92,93]. In particular, the Nd-doped vanadate laser materials are often categorized as self-Raman materials since they can simultaneously generate the fundamental laser field and the Raman Stokes field.…”