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 watt-level bottle beam, formed by the coherent superposition of Gaussian and radial LG modes.

Direct generation of 1108 nm and 1173 nm Laguerre-Gaussian modes from a self-Raman Nd:GdVO₄ laser

Yuanyuan Ma, Andrew J. Lee, Helen M. Pask, Katsuhiko Miyamoto, and Takashige Omatsu
Opt. Express 28(16) 24095-24103 (2020)

Continuous-wave, intracavity doubled, self-Raman laser operation in Nd:GdVO₄ at 586.5 nm

Peter Dekker, Helen M. Pask, David J. Spence, and James A. Piper
Opt. Express 15(11) 7038-7046 (2007)

High efficiency, multi-Watt CW yellow emission from an intracavity-doubled self-Raman laser using Nd:GdVO4

A. J. Lee, H. M. Pask, P. Dekker, and J. A. Piper
Opt. Express 16(26) 21958-21963 (2008)

Direct generation of a first-Stokes vortex laser beam from a self-Raman laser

Andrew J. Lee, Takashige Omatsu, and Helen. M. Pask
Opt. Express 21(10) 12401-12409 (2013)

Watt-level output power and near-diffraction-limit beam quality mid-infrared Ho:GdVO₄ self-Raman laser at 2.5 µm

Panqiang Kang, Xinlu Zhang, Xiaofan Jing, Conghui Chen, Longyi Zhang, and Jinjer Huang
Opt. Express 32(6) 10479-10489 (2024)