KGW crystals
Main features
- Broad transparency range from 300 nm to 5 μm
- Large pump polarisation-dependent Raman shifts of 768 cm-1 and 901 cm-1
- Excellent Raman shifter for picosecond applications
- Custom dimensions, orientation and coatings available upon request
Application examples
- Raman generator pumped by commercially available picosecond Nd:YAG
laser
Request custom
- Description
- Properties
- Specifications
Potassium gadolinium tungstate (KGd(WO4)2, KGW) crystals feature good mechanical properties, relatively good thermal conductivity (2,5-3,4 Wm-1K-1) and wide transparency range, which spans from 350 nm to 5 μm. KGW as Raman crystal feature two large Raman modes of 768 cm-1 and 901 cm-1, which are pump polarization dependent. 4Lasers recommend to use KGW crystal as Raman shifter for picosecond applications.
| Physical and optical properties | |
|---|---|
| Chemical formula | KGd(WO4)2 |
| Crystal structure | Monoclinic, C2c |
| Lattice parameters | a = 10,652(4) Å, b = 10,374(6) Å, c = 7,582(2) Å |
| Density | 7,27 g/cm3 |
| Mohs hardness | 4-5 |
| Transparency range | 0,3 - 5 μm |
| Refractive index @1064 nm | np=1,982, nm=2,010, ng=2,061 |
| Thermal conductivity | Ka = 2,6 Wm-1K-1, Kb = 3,8 Wm-1K-1, Kc = 3,4 Wm-1K-1 |
| dn/dT | dnp/dT = -15,7×10-6K-1, dnm/dT = -11,8×10-6K-1, dng/dT = -17,3×10-6K-1 |
| Raman frequency shift | 901 cm-1 (p[mm]p), 767 cm-1 (p[gg]p) |
| Raman linewidth | 5,4 cm-1@901 cm-1 (p[mm]p), 6,4 cm-1@767 cm-1 (p[gg]p) |
| Raman gain (ps, transient-state regime) | 11 cm/[email protected] nm, 3 cm/[email protected] nm |
| Dephasing time | 2 ps |
| KGW crystals | |
|---|---|
| Orientarion | 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 |
| Coatings | AR(R<0,5%)@450-800 nm |
| Laser induced damage threshold | >10 J/cm2@1064 nm, 10 ns |
| Mount | Unmounted |
Order your item
Face dimensions
Length
Doping
Coatings
SKU
price
quantity
5x5 mm
15 mm
undoped
uncoated
7259
390 €
5x5 mm
30 mm
undoped
uncoated
7260
490 €
5x5 mm
45 mm
undoped
uncoated
7261
680 €
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