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
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 |
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