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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
  • Laser radiation frequency tuning
Request custom
  • Description
  • Properties
  • 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 have 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 index @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
Orientarion 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
Coatings AR(R<0,5%)@450-800 nm
Laser induced damage threshold >10 J/cm2@1064 nm, 10 ns
Mount Unmounted
Order your item
Face dimensions Length Coatings SKU price quantity
5x5 mm
15 mm
uncoated
7273
390 €
5x5 mm
30 mm
uncoated
7274
490 €
5x5 mm
45 mm
uncoated
7275
680 €
5x5 mm
15 mm
7276
490 €
5x5 mm
30 mm
7277
590 €
5x5 mm
45 mm
7278
780 €