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Arminas Butkus +370 5 219 4884
KYW crystals
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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
  • Radiation frequency tuning
Request custom
  • Description
  • Properties
  • Specifications

Potassium Yttrium Tungstate (in short – KYW) is a monoclinic double tungstate crystal used as a Raman shifter for laser radiation frequency tuning or in Raman lasers. It has a broad transparency range from 0,35 μm to 5,5 μm and two large Raman shifts of 765 cm-1 and 905 cm-1.

Raman related spectroscopic and thermo-mechanical properties
Crystal symmetry Monoclinic, C2/c
Density 6,61 g/cm3
Hardness 4-5 Mohs
Transparency range 0,35-5,5 μm
Refractive indices @633 nm, room temperature np=1,9979
nm=2,0396
ng=2,0869
Thermo-optic coefficients @1064 nm 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 νR 765 cm-1 (E||Ng)
905 cm-1 (E||Nm)
Raman linewidth ∆νR 8,69±0,02 cm-1 E||Ng (765 cm-1)
8,82±0,02 cm-1 E||Nm (765 cm-1)
6,88±0,003 cm-1 E||Ng (905 cm-1)
6,89±0,003 cm-1 E||Nm (905 cm-1)
1,1 cm-1 (87 cm-1)
Raman gain for 1064 nm pumping 4,5 cm/GW (765 cm-1)
3,6 cm/GW (905 cm-1)
9,2 cm/GW (87 cm-1)
Dephasing time TR 9,6 ps (87 cm-1 mode)
Thermal expansion coefficient α αp=2,0×10-6 K-1
αm=10,3×10-6 K-1
αg=15,9×10-6 K-1
KYW crystals
Orientation b-cut
Clear aperture >90%
Face dimensions tolerance +0/-0,1 mm
Length tolerance ±0,1 mm
Parallelism error <10 arcsec
Perpendicularity error <10 arcmin
Protective chamfers <0,1 mm at 45˚
Surface quality 10-5 S-D
Surface flatness <λ/[email protected],8 nm
Wavefront distortion <λ/[email protected],8 nm
Laser induced damage threshold >10 J/cm2@1064 nm, 10 ns
Mount Contact us
Order your item
Face dimensions Length Coatings SKU price quantity
5x5 mm
15 mm
uncoated
7273
Request
5x5 mm
30 mm
uncoated
7274
Request
5x5 mm
45 mm
uncoated
7275
Request
5x5 mm
15 mm
7276
Request
5x5 mm
30 mm
7277
Request
5x5 mm
45 mm
7278
Request