Crystals Materials
KGW Crystals for raman shifter for nanosecond applications
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.
| 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 |
| Property | Value |
|---|---|
| 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 |
Stock specification list
If need other specifications and quantities products, please contact us(sales@aogcrystal.com).
Anti-reflection coatings are available at your specified wavelength.
Be sure to wear laser safety goggles when checking optical path and adjusting optical axis.
To inquiry or order a finished KGW laser rod, please specify the specification listed above, for common application, we only need to know the main specification: Nd-dopant concentration, sizes, and coating. For special request,
please specify specification in details for evaluation and fabrication.
| Part Number | Face size | Length | Doping | Coating |
|---|---|---|---|---|
| KGW-Cry-001 | 5.0*5.0 mm | 15.0 mm | undoped | UnCoated |
| KGW-Cry-002 | 5.0*5.0 mm | 50.0 mm | undoped | AR/AR@450-800 nm |
Documents Download