Steady‐state picosecond stimulated Raman scattering in two host‐crystals for Ln3+ and Ln2+ lasants
ABSTRACT Efficient room-temperature high-order Stokes and anti-Stokes steady-state generation in two wide-used hostcrystals LuVO4 and CaF2 for lanthanide lasants has been discovered. All recorded χ(3)-lasing components are identified to the SRS-promoting phonon modes of these crystals. We classi- fied lutetium vanadate and fluorite as media for promising for up- and down-Raman laser-frequency converters, as well as for self-SRS lasers. (© 2006 by Astro, Ltd. Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA)
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ABSTRACT: We report on laser action in linear and ring Raman oscillators based on novel χ(3)-active PbWO4 crystals with scheelite structure (ωR=901 cm−1). These resonators are pumped by the fundamental and the second harmonic wavelengths, respectively, of a Q-switched Nd3+:Y3Al5O12 laser. In these preliminary measurements, conversion efficiencies as high as 20% are observed. To our knowledge, this is the first such demonstration of Raman lasing in lead tungstate in the nanosecond regime. Raman lasers based on PbWO4 are very promising for several applications, including the generation of wavelengths in the uv (in conjunction with other nonlinear processes) for ozone differential absorption lidar. This material has optical transparency from ≈0.33 to ≈5.5 μm, making it also potentially useful for trace gas detection in the infrared. Furthermore, it has a high damage threshold and is not hydroscopic. Some new data on picosecond high-order Stokes and anti-Stokes generation are also presented. In particular, our SRS experiments with a 1-μm Nd3+:Y3Al5O12 pump laser demonstrate multiple anti-Stokes emission up to the 10th component with λASt10=0.5433 μm.Optics Communications. 01/2000;
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ABSTRACT: Spectroscopic, laser, and (3) nonlinear optical properties of tetragonal PbWO 4 , NaY(WO 4 ) 2 , CaWO 4 , and monoclinic CdWO 4 and ZnWO 4 were investigated. Particular attention was paid to Nd 3 -doped and undoped PbWO 4 and NaY(WO 4 ) 2 crystals. Their absorption and luminescence intensity characteristics, including the peak cross sections of induced transitions, were determined. Pulsed and continuous-wave lasing in the two 4 F 3 2 4 I 11 2 and 4 F 3 2 4 I 13 2 channels was excited. For these five tungstates, highly efficient (greater than 50%) multiple Stokes generation and anti-Stokes picosecond generation were achieved. All the observed scattered laser components were identified. These results were analyzed and compared with spectroscopic data from spontaneous Raman scattering. A new crystalline Raman laser based on PbWO 4 was developed for the (3) conversion frequency of 1- m pump radiation to the first Stokes emission with efficiency up to 40%. We classify all the tungstates as promising media for lasers and neodymium-doped crystals for self-stimulated Raman scattering lasers.Applied Optics - APPL OPT. 01/1999; 38(21):4533-4547.
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ABSTRACT: Stokes and anti-Stokes picosecond generation in potential laser-host YbVO4 single crystal has been observed for the first time. All measured stimulated Raman scattering (SRS) wavelengths in the visible and near-IR are identified and attributed to the SRS-promoting vibration mode of this tetragonal vanadate. (© 2006 by Astro, Ltd. Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA)Laser Physics Letters 01/2006; 3(5):263 - 267. · 7.71 Impact Factor