All-solid-state, synchronously pumped, ultrafast BaWO4 Raman laser with long and short Raman shifts generating at 1180, 1225, and 1323 nm
At a Glance
Section titled âAt a Glanceâ| Metadata | Details |
|---|---|
| Publication Date | 2017-12-01 |
| Authors | Milan Frank, VĂĄclav KubeÄek, Michal JelĂnek, S. N. Smetanin, L. I. Ivleva |
| Institutions | National University of Science and Technology, Czech Technical University in Prague |
Abstract
Section titled âAbstractâA lot of attention is currently focused on synchronously pumped, extra-cavity crystalline Raman lasers generating one or two Stokes Raman components in KGW or diamond Raman-active crystals, and also generating additional components of stimulated polariton scattering in lithium niobate crystal having both cubic and quadratic nonlinearities.<br/> In this contribution we report on generation of more than two Stokes components of stimulated Raman scattering with different Raman shifts in the all-solid-state, synchronously pumped, extra-cavity Raman laser based on the Raman-active a-cut BaWO<sub>4</sub> crystal excited by a mode-locked, 220 nJ, 36 ps, 150 MHz diode sidepumped Nd:GdVO<sub>4 </sub>laser generating at the wavelength of 1063 nm. Excitation by the pumping radiation polarized along the BaWO<sub>4 </sub>crystal optical axis resulted in the Raman generation with not only usual (925cm <sup>- 1</sup>), but also additional (332cm <sup>- 1</sup>) Raman shift. Besides the 1180-nm first and 1323 nm second Stokes components with the Raman shift of 925cm<sup> - 1</sup> from the 1063nm fundamental laser wavelength, we have achieved generation of the additional 1227 nm Raman component with different Raman shift of 332cm<sup> - 1 </sup>from the 1180nm component. At the 1227 nm component the strongest 12-times pulse shortening from 36ps down to 3ps was obtained due to shorter dephasing time of this additional Raman line (3ps for the 332-cm<sup> - 1</sup> line instead of 6.5ps for the 925cm<sup> - 1</sup> line). It has to be also noted that the 1225 nm generation is intracavity pumped by the 1179 nm first Stokes component resulting in the strongest pulse shortening close to the 332cm <sup>-1</sup> line dephasing time (3ps). Slope efficiency of three Stokes components generation exceeded 20%.