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Senior sales engineer
Arminas Butkus +370 5 219 4884
Yb:KGW crystals
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Yb:KGW crystals

Main features

 

  • Large gain bandwidth
  • High emission cross-sections
  • Small quantum defect
  • High doping level
  • High thermal conductivity
  • Custom crystals available upon request

 

Application examples

 

  • Femtosecond lasers and regenerative amplifiers
  • CW and passively mode-locked thin-disk lasers
Request custom View stock
  • Description
  • Properties
  • Absorption and emission curves
  • Standard specifications

Yb3+:KGW crystals possess a large gain bandwidth that enables them to obtain <100 fs pulse duration in the mode-locked regime of operation. Compared with other ytterbium-doped gain media with a similarly large gain bandwidth, ytterbium-doped tungstate has fairly high emission cross-sections. The ytterbium doping concentration in Yb:KGW crystals can be up to 5 at. % without a significant quenching. Thermal conductivity of common double tungstates is in the range of 3–4 Wm-1K-1. Yb:KGW crystals exhibit a small quantum defect and it is possible to operate with a quantum defect well below ~4-5%.

Spectroscopic and thermo-mechanical properties
Absorption peak wavelength 980 nm
Absorption cross-section at peak wavelength 12 × 10-20 cm2 (E || Nm)
Absorption bandwidth at peak wavelength 3,7 nm
Laser wavelength 1025 (1020-1060) nm
Lifetime of 2F5/2 ytterbium energy level 240 μs
Emission cross-section at 1030 nm 3 × 10-20 cm2 (E || Nm)
Refractive index at 1064 nm ng= 2,037
np= 1,986
nm= 2,033
Crystal structure Monoclinic
Density 7,25 g/cm3
Mohs hardness 4-5
Thermal conductivity Ka= 2,6 Wm-1 K-1
Kb= 3,8 Wm-1 K-1
Kc= 3,4 Wm-1 K-1
dn/dT dnp/dT = -15,7 × 10-6 K-1
dnm/dT = -11,8 × 10-6 K-1
dng/dT = -17,3 × 10-6 K-1
Thermal expansion coefficient αp = 1,7 × 10-6 K-1
αm = 11,01 × 10-6 K-1
αg = 17,37 × 10-6 K-1
Typical doping level, at. % 1-5 at. %

Yb:KGW crystals
Orientation Ng-cut; Np(b)-cut and other orientation available
Clear aperture >90%
Face dimensions tolerance +0,0/-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/10@632,8 nm
Coatings AR(R<0,5%)@970-1070 nm
Laser-induced damage threshold >10 J/cm2@1040 nm, 10 ns
Mount Unmounted
Order your item
Face dimensions Length End faces Doping Coatings SKU PRICE QUANTITY
3x3 mm
10 mm
Right-angle cut
0,7%
AR/AR@970-1070 nm
7049
590 €
5x5 mm
10 mm
Right-angle cut
0,7%
AR/AR@970-1070 nm
7050
590 €
3x3 mm
10 mm
Brewster-angle cut
0,7%
uncoated
7051
540 €
5x5 mm
10 mm
Brewster-angle cut
0,7%
uncoated
7052
540 €
3x3 mm
5 mm
Right-angle cut
2%
AR/AR@970-1070 nm
7053
590 €
5x5 mm
5 mm
Right-angle cut
2%
AR/AR@970-1070 nm
7054
590 €
3x3 mm
5 mm
Brewster-angle cut
2%
uncoated
7055
540 €
5x5 mm
5 mm
Brewster-angle cut
2%
uncoated
7056
540 €
3x3 mm
3 mm
Right-angle cut
3%
AR/AR@970-1070 nm
7057
590 €
5x5 mm
3 mm
Right angle cut
3%
AR/AR@970-1070 nm
7058
590 €
3x3 mm
3 mm
Brewster-angle cut
3%
uncoated
7059
540 €
5x5 mm
3 mm
Brewster-angle cut
3%
uncoated
7060
540 €
3x3 mm
2 mm
Right-angle cut
5%
AR/AR@970-1070 nm
7061
590 €
5x5 mm
2 mm
Right-angle cut
5%
AR/AR@970-1070 nm
7062
590 €
3x3 mm
2 mm
Brewster-angle cut
5%
uncoated
7063
540 €
5x5 mm
2 mm
Brewster-angle cut
5%
uncoated
7064
540 €