KYW crystals
Main features
- Broad transparency range from 350 nm to 5,5 μm
- Two large Raman shifts of 765 cm-1 and 905 cm-1
Application examples
- Raman lasers
- Laser radiation frequency tuning
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- Description
- Properties
- Standard specifications
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.
| Physical and optical properties | |
|---|---|
| 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 |
| KYW 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
Coatings
SKU
PRICE
QUANTITY
5x5 mm
50 mm
uncoated
31051
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5x5 mm
50 mm
AR/AR@500-600 nm + 1000-1200 nm
31052
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5x5 mm
15 mm
uncoated
7273
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5x5 mm
30 mm
uncoated
7274
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5x5 mm
45 mm
uncoated
7275
Request
5x5 mm
15 mm
AR/AR@500-600 nm + 1000-1200 nm
7276
Request
5x5 mm
30 mm
AR/AR@500-600 nm + 1000-1200 nm
7277
Request
5x5 mm
45 mm
AR/AR@450-800 nm
7278
Request
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