for wavelength conversion using Raman shift
New nominally pure and neodymium doped Barium tungstate, Strontium tungstate and Strontium molybdate single crystals are now available:
- Ba(MoO4)x(WO4)1-x, 0<x<0.01
- Sr(MoO4)x(WO4)1-x, 0<x<0.01
- Sr(MoO4)x(WO4)1-x, 0.99<x<1
New Barium and Strontium tungstate-molybdate single crystals feature higher Raman gain as compared to KGW or CaCO3 and relatively higher thermal conductivity as compared to a Ba(NO3)2.
Barium and Strontium tungstate-molybdate single crystals are grown and provided with cut along a-direction. Active elements do not require precise positioning since stimulated Raman scattering (SRS) threshold slightly depends on the crystal orientation relative to pump polarization (within a few percent) and minimum threshold is reached at E||c. In this case, the polarization of the pump and stokes pulses are parallel to the optical axis (c-axis).
The crystals are water-insoluble and durable. Available sizes and shapes of active elements are rectangular up to 10 x 10 x 100 mm or with cylindrical cross-section up to dia 10 x 100 mm.
- Raman converters – new crystals extend the capabilities of the Raman devices in addition to commercially available Ba(NO3)2, CaCO3, KGW crystals, since new crystals have different values of the Stokes shift and allow to obtain a laser radiation at the other wavelengths
- Raman lasers, including self-Raman generation
- Laser pulse compressors based on stimulated Raman scattering effect
Other Choices for Stimulated Raman Scattering
Thermal effects are significantly smaller in KGW. This along with the high damage threshold make the crystal an excellent candidate for power scaling.
Barium Nitrate Crystals
Ba(NO3)2 has the highest Raman gain coefficient among other SRS crystals. However, the thermal lensing is particularly strong in this material.
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