Stimulated Raman scattering in Nd:SrWO₄

Abstract

Stimulated Raman scattering process in Nd:SrWO 4 crystal was employed to frequency down-shift the fundamental frequency of a Nd:YAG mode-locked laser system. A single-pass configuration of Raman crystal was investigated for this purpose. After that Nd:SrWO 4 laser was built and coherent pumping by alexandrite laser radiation was used. The simultaneous generation of stimulated Raman scattering was proofed for the case of Q-switching and mode-locking of Nd:SrWO 4 Raman cavity. For Nd:YAG 50 ps long (1064 nm) pulsed pumping a single-pass first Stokes maximum energy and conversion efficiency were 1.6 mJ and 25% , respectively. With the free-running Nd:SrWO 4 laser the maximum energy of 90 mJ at wavelength 1057 nm was obtained. Q-switching with the LiF:F − 2 saturable absorber gave up to 1.3 mJ energy at the first Stokes frequency (1170 nm) in the pulse length of 3 ns. In mode-locking regime (with saturable absorber ML51 in dichlorethan or 3955 in ethanol), the total generated energy was 1.8 mJ and 2.4 mJ for ML51 and 3955 dyes, respectively. The SRS output at 1170 nm was approximately 20% of those values.

Growth, structure and spectroscopic characterization of a new laser crystals Nd3+:Li3Ba2Gd3(WO4)8

“…The polycrystalline samples of Li 3 Ba 2 Gd 3 (WO 4 ) 8 were prepared using the solid-state reaction method according to the following reaction: 3Li 2 CO 3 + 4BaCO 3 + 3Gd 2 O 3 + 16WO 3 = 2Li 3 Ba 2 Gd 3 (WO 4 ) 8 soaked into the solution, and then the temperature was cooled down to 900 • C at a rate of 10 • C/day. The crystals grown on the platinum wire were drawn out of the solution surface and cooled down to room temperature.…”

“…Recently the tungstate crystals have been widely investigated as a new laser host material [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. For example, Nd 3+ :KGd(WO 4 ) 2 crystal exhibited the high efficiency for stimulated emission at low pumping energies with diode laser pumping [9]; KYb(WO 4 ) 2 crystal was regarded as a potential candidate for microchip laser medium [13].…”

Recent advances in strontium tungstate scheelite material

“…This unique structure allows the introduction of impurity ions and the usage of these crystals as matrices for laser active elements with nonlinear self-conversion of radiation to a new spectral range [75]. In recent years, there are lots of studies on SRS of neat and rare-earth ions doped strontium tungstate [76][77][78][79][80][81][82][83][84][85][86][87][88][89][90][91][92][93]. The most attractive one is Nd 3+ -doped SrWO 4 crystal.…”

Additive induced morphology changes of nano‐crystalline SrWO4

“…SrWO 4 is an important optical material that is widely used in Raman converters and solid-state lasers [10,11]. However, only a few groups have examined synthetic methods that lead to assembled SrWO 4 structures.…”