Crystals Materials
KYW Crystals for raman lasers and laser radiation frequency tuning applications
Potassium yttrium tungstate (KY(WO4)2, KYW) crystals offer two strong phonon modes around 765 cm-1 and 905 cm-1, which have similar Raman gain and are pump polarization dependent. KYW crystals possess good mechanical properties, high optical damage threshold, broad transparency range (350 nm - 5,5 µm), and thermal conductivity around three times higher than barium nitrate.
| 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 | KY(WO4)2 |
| Crystal structure | Monoclinic, C2/c |
| Lattice parameters | a = 10.64 Å, b = 10.32 Å, c = 7.55 Å |
| Density | 6.61 g/cm3 |
| Mohs hardness | 4-5 |
| Transparency range | 0.35-5.5 μm |
| Refractive indices (1064 nm, room temperature) | np = 1.9688, nm = 2.0065, ng = 2.0507 |
| Thermal conductivity (average value) | 3.3 Wm-1K-1 |
| dn/dT | dnp/dT=-14.6 × 10-6 K-1, dnm/dT=-8.9 × 10-6 K-1, dng/dT=-12.4 × 10-6 K-1 |
| Raman frequency shift (T = 300 K) | 905 cm-1 (E||Nm), 765 cm-1 (E||Ng) |
| Raman gain (1064 nm pump, steady-state regime) | 3.6 cm/GW |
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 KYW 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 |
|---|---|---|---|---|
| KYW-Cry-001 | 5.0*5.0 mm | 15.0 mm | undoped | UnCoated |
| KYW-Cry-002 | 5.0*5.0 mm | 50.0 mm | undoped | AR/AR@450-800 nm |
Documents Download