Title :
Generation of Higher Order Vortex Beams From a YVO4/Nd:YVO4 Self-Raman Laser via Off-Axis Pumping With Mode Converter
Author :
Cheng-Yeh Lee ; Chuan-Ching Chang ; Chun-Yu Cho ; Pi-Hui Tuan ; Yung-Fu Chen
Author_Institution :
Dept. of Electrophys., Nat. Chiao Tung Univ., Hsinchu, Taiwan
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 pumping. 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 TEM28,0.
Keywords :
Raman lasers; laser beams; laser cavity resonators; neodymium; optical pumping; solid lasers; stimulated Raman scattering; yttrium compounds; Stokes field; TEM0,0 mode; TEM3,0 mode; YVO4-YVO4:Nd; diode-end-pumped laser; extra-cavity mode converter; high-order Hermite-Gaussian beams; mode converter; off-axis pumping; power 18.6 W; self-Raman laser; stimulated Raman scattering; threshold pump power; Laser beams; Laser excitation; Laser modes; Optical vortices; Power generation; Pump lasers; Semiconductor lasers; Beam transformation; Optical vortices; Raman scattering; diode pumping;
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
DOI :
10.1109/JSTQE.2014.2324754
