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Arminas Butkus +370 5 219 4884
KGW crystals
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KGW crystals

Main features

 

  • Broad transparency range from 300 nm to 5 μm
  • Two pump polarization-dependent Raman shifts at 768 cm-1 and 901 cm-1
  • Excellent Raman shifter for picosecond applications
  • Custom dimensions, orientation, and coatings available upon request

 

Application examples

 

  • Raman generator pumped by commercially available picosecond Nd:YAG laser
Request custom
  • Description
  • Properties
  • Standard specifications

Potassium gadolinium tungstate (KGd(WO4)2, KGW) crystals feature good mechanical properties, relatively good thermal conductivity (2,5-3,4 Wm-1K-1), and a wide transparency range, which spans from 350 nm to 5 µm. KGW as a Raman crystal features two large Raman modes at 768 cm-1 and 901 cm-1, which are pump polarization dependent. 4Lasers recommend using KGW crystal as a Raman shifter for picosecond applications.

Physical and optical properties
Chemical formula  KGd(WO4)2
Crystal structure Monoclinic, C2c
Lattice parameters a = 10,652(4) Å, b = 10,374(6) Å, c = 7,582(2) Å
Density 7,27 g/cm3
Mohs hardness 4-5
Transparency range 0,3-5 μm
Refractive indices @1064 nm np=1,982
nm=2,010
ng=2,061
Thermal conductivity Ka = 2,6 Wm-1K-1 
Kb = 3,8 Wm-1K-1 
Kc = 3,4 Wm-1K-1
dn/dT dnp/dT = -15,7 × 10-6K-1
dnm/dT = -11,8 × 10-6K-1 
dng/dT = -17,3 × 10-6K-1
Raman frequency shift 901 cm-1 (p[mm]p)
767 cm-1 (p[gg]p)
Raman linewidth 5,4 cm-1@901 cm-1 (p[mm]p)
6,4 cm-1@767 cm-1 (p[gg]p)

Raman gain

(ps, transient-state regime)

11 cm/[email protected] nm
3 cm/[email protected] nm
Dephasing time 2 ps
KGW 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/[email protected],8 nm
Wavefront distortion <λ/[email protected],8 nm
Coatings AR(R<0,7%)@500-650 nm
Laser-induced damage threshold >10 J/cm2@1064 nm, 10 ns
Mount Unmounted
Order your item
Face dimensions Length Doping Coatings SKU PRICE QUANTITY
5x5 mm
15 mm
undoped
uncoated
7259
390 €
5x5 mm
30 mm
undoped
uncoated
7260
490 €
5x5 mm
45 mm
undoped
uncoated
7261
680 €
5x5 mm
15 mm
undoped
7262
540 €
5x5 mm
30 mm
undoped
7263
640 €
5x5 mm
45 mm
undoped
7264
830 €