We offer yttrium potassium tungstate (KYW) crystals in various sizes. The KYW crystal provides two strong phonon modes near 765 cm-1 and 905 cm-1, which have similar Raman gain and depend on the pump polarization. KYW crystals have good mechanical properties, high optical damage threshold, wide transparency range, and thermal conductivity about three times higher than barium nitrate.
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Catalog Number
ACMA00027574
Product Name
KYW Crystals, 45mm Length, AR/AR@450-800nm
Molecular Formula
KY(WO4)2
Width
5 mm
Height
5 mm
Length
45 mm
Orientation
b-cut
DimensionTolerance
W±0.1mm/H±0.1mm/L±0.2mm
Coating
AR/AR@450-800 nm
Flatness
λ/8@632.8 nm
Parallelism
< 20 arcsec
Perpendicularity
<10 arcmin
Surface Quality
10-5 S-D
ClearAperture
>90%
Crystal Structure
Monoclinic, C2/c
Lattice Parameters
a = 10.64 Å, b = 10.32 Å, c = 7.55 Å
Density
6.61 g/cm3
Transparency Region
0.35-5.5 μm
Refractive Indices
(@1064 nm) np = 1.9688, nm = 2.0065, ng = 2.0507
Thermal Optical Coefficient
dnp/dT = -14.6×10-6 /K
dnm/dT = -8.9×10-6 /K
dng/dT = -12.4×10-6 /K
Thermal Conductivity
3.3 W/m/K
Damage Threshold
(Laser-induced) >10 J/cm2@1064 nm, 10 ns
Raman Frequency Shift
905 /cm (E||Nm); 765 /cm (E||Ng)
Moh'sHardness
4~5
MSDS
COA
Spec Sheet
Broad transparency range from 350 nm to 5.5 μm; two large Raman shifts at 765 cm-1 and 905 cm-1
Raman laser; laser radiation frequency tuning