Senior sales engineer
Arminas Butkus +370 5 219 4884
KGW crystals
INQUIRY FORM
Please fill out this field
Please fill out this field
Please fill out this field
Please fill out this field
Please fill out this field
Close
Close
Success!

One of our 4Lasers team members will contact you as soon as possible.

Go back to homepage

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 View stock
  • 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/GW@532 nm
3 cm/GW@1064 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/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
Order your item
Face dimensions Length Doping Coatings SKU PRICE QUANTITY
5x5 mm
50 mm
undoped
AR/AR@450-800 nm
11429
1120 €
5x5 mm
50 mm
undoped
uncoated
22033
900 €
5x5 mm
15 mm
undoped
uncoated
7259
440 €
5x5 mm
30 mm
undoped
uncoated
7260
600 €
5x5 mm
45 mm
undoped
uncoated
7261
860 €
5x5 mm
15 mm
undoped
AR/AR@450-800 nm
7262
600 €
5x5 mm
30 mm
undoped
AR/AR@450-800 nm
7263
780 €
5x5 mm
45 mm
undoped
AR/AR@450-800 nm
7264
1070 €