KGW crystals
Main features
- Broad transparency range from 300 nm to 5 μm
- Two pump polarization-dependent Raman shifts at 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
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- Description
- Properties
- Standard 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 a wide transparency range, which spans from 350 nm to 5 µm. KGW as a Raman crystal features two large Raman modes at 768 cm-1 and 901 cm-1, which are pump polarization dependent. 4Lasers recommend using KGW crystal as a 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 indices @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/GW@532 nm 3 cm/GW@1064 nm |
| Dephasing time | 2 ps |
| KGW crystals | |
|---|---|
| Orientation | b-cut |
| Clear aperture | >90% |
| Face dimensions tolerance | +0,0/-0,1 mm |
| Length tolerance | ±0,1 mm |
| Parallelism error | <20 arcsec |
| Perpendicularity error | <10 arcmin |
| Protective chamfers | <0,1 mm at 45˚ |
| Surface quality | 10-5 S-D |
| Surface flatness | <λ/8@632,8 nm |
| Wavefront distortion | <λ/4@632,8 nm |
| Coatings | AR(R<0,7%)@500-650 nm |
| Laser-induced damage threshold | >10 J/cm2@1064 nm, 10 ns |
| Mount | Unmounted |
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Face dimensions
Length
Doping
Coatings
SKU
PRICE
QUANTITY
5x5 mm
50 mm
undoped
AR/AR@450-800 nm
11429
Request
5x5 mm
50 mm
undoped
uncoated
22033
Request
5x5 mm
15 mm
undoped
uncoated
7259
600 €
5x5 mm
30 mm
undoped
uncoated
7260
700 €
5x5 mm
45 mm
undoped
uncoated
7261
Request
5x5 mm
15 mm
undoped
AR/AR@450-800 nm
7262
900 €
5x5 mm
30 mm
undoped
AR/AR@450-800 nm
7263
1000 €
5x5 mm
45 mm
undoped
AR/AR@450-800 nm
7264
Request
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