KGW crystals
Main features
- Broad transparency range from 300 nm to 5 μm
- Two large Raman shifts of 768 cm-1 and 901 cm-1
Application examples
- Raman lasers
- Radiation frequency tuning
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- Description
- Properties
- Specifications
Potassium Gadolinium Tungstate (in short – KGW) is a monoclinic double tungstate crystal used as a Raman shifter for laser radiation frequency tuning or in Raman lasers. It has a broad transparency range from 350 nm to 5,5 μm and two large Raman shifts of 768 cm-1 and 901 cm-1.
| Raman related spectroscopic and thermo-mechanical properties | |
|---|---|
| Crystal symmetry | Monoclinic, C2/c |
| Density | 7,27 g/cm3 |
| Hardness | 4-5 Mohs |
| Transparency range | 0,3-5 μm |
| Refractive indices @1064 nm | ng=2,061 np=1,982 nm=2,010 |
| Thermo-optic coefficients @1064 nm | dnp/dT=-15,7×10-6 K-1 dnm/dT=-11,8×10-6 K-1 dng/dT=-17,3×10-6 K-1 |
| Raman frequency shift νR | 901 cm-1 (p[mm]p) 768 cm-1 (p[gg]p) |
| Raman linewidth ∆νR | 5,4 cm-1 (p[mm]p) 6,4 cm-1 (p[gg]p) |
| Raman gain for 1064 nm pumping | 4,4 cm/GW (768 cm-1) 3,5 cm/GW (901 cm-1) |
| Dephasing time TR | 2 ps |
| Thermal conductivity at 25oC | 2,5-3,4 Wm-1K-1 |
| Thermal expansion coefficient α | 1,6-8,5×10-6 1oC-1 |
| KGW crystals | |
|---|---|
| Orientation | b-cut |
| Clear aperture | >90% |
| Face dimensions tolerance | +0/-0,1 mm |
| Length tolerance | ±0,1 mm |
| Parallelism error | <10 arcsec |
| Perpendicularity error | <10 arcmin |
| Protective chamfers | <0,1 mm at 45˚ |
| Surface quality | 10-5 S-D |
| Surface flatness | <λ/[email protected],8 nm |
| Wavefront distortion | <λ/[email protected],8 nm |
| Laser induced damage threshold | >10 J/cm2@1064 nm, 10 ns |
| Mount | Contact us |
Order your item
Face dimensions
Length
Doping
Coatings
SKU
price
quantity
5x5 mm
15 mm
undoped
uncoated
7259
Request
5x5 mm
30 mm
undoped
uncoated
7260
Request
5x5 mm
45 mm
undoped
uncoated
7261
Request
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