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

Main features

 

  • Large gain bandwidth
  • High emission cross-sections
  • Small quantum defect
  • High doping level
  • High enough 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+:KYW 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 tungstates have fairly high emission cross-sections. The ytterbium doping concentration in Yb:KYW crystals can be very high without a significant quenching. Thermal conductivity of common double tungstates is in the range of 3–4 Wm-1K-1. Yb:KYW crystals also feature a small quantum defect.

Spectroscopic and thermo-mechanical properties
Absorption peak wavelength 980 nm
Absorption cross-section at peak wavelength 14 × 10-20 cm2 (E||Nm)
Absorption bandwidth at peak wavelength ~3 nm
Laser wavelength 1020 (1020-1050) nm
Lifetime of 2F5/2 ytterbium energy level 230 μs
Emission cross-section at 1030 nm 2,5 × 10-20 cm2 (E||Nm)
Refractive index at 1064 nm ng= 2,037
np= 1,986
nm= 2,033
Crystal structure Monoclinic
Density 6,61 g/cm3
Mohs hardness 4-5
Thermal conductivity ~3,3 Wm-1K-1
dn/dT dnp/dT = -13,08 × 10-6 K-1
dnm/dT = -7,61 × 10-6 K-1
dng/dT = -11,83 × 10-6 K-1
Thermal expansion coefficient αp= 1,9 × 10-6 K-1
αm= 10,3 × 10-6 K-1
αg= 16,5 × 10-6 K-1
Typical doping level 1-100 at. %

Yb:KYW 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 Uncoated
Order your item
Face dimensions Length End faces Orientation Doping Coatings SKU PRICE QUANTITY
3x3 mm
5 mm
Right-angle cut
Ng-cut
2%
AR/AR@970-1070 nm
7035
590 €
5x5 mm
5 mm
Right-angle cut
Ng-cut
2%
AR/AR@970-1070 nm
7036
590 €
3x3 mm
5 mm
Brewster-angle cut
Ng-cut
2%
uncoated
7037
540 €
5x5 mm
5 mm
Brewster-angle cut
Ng-cut
2%
uncoated
7038
540 €
3x3 mm
2 mm
Brewster-angle cut
Ng-cut
5%
uncoated
7039
540 €
5x5 mm
2 mm
Right-angle cut
Ng-cut
5%
AR/AR@970-1070 nm
7040
590 €
3x3 mm
2 mm
Right-angle cut
Ng-cut
5%
AR/AR@970-1070 nm
7041
590 €
5x5 mm
2 mm
Brewster-angle cut
Ng-cut
5%
uncoated
7042
540 €
3x3 mm
1 mm
Right-angle cut
Ng-cut
10%
AR/AR@970-1070 nm
7043
590 €
5x5 mm
1 mm
Right-angle cut
Ng-cut
10%
AR/AR@970-1070 nm
7044
590 €
3x3 mm
1 mm
Brewster-angle cut
Ng-cut
10%
uncoated
7045
540 €
5x5 mm
1 mm
Brewster-angle cut
Ng-cut
10%
uncoated
7046
540 €