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Yb:KGW and Yb:KYW Crystals

Yb-Doped Potassium Gadolinium Tungstate (Yb:KGd(WO4)2) and Yb-doped Potassium Itrium Tungstate (Yb:KY(WO4)2) single crystals are the laser crystals for diode or laser pumped solid-state laser applications.

Applications:

  • Yb:KGW and Yb:KYW thin (100–150 µm) crystals are used as lasing materials to generate ultrashort (< 100 fs) high power (> 22 W) pulses. Standard pumping at 981 nm, output: 1023–1060 nm
  • Yb:KGW and Yb:KYW can be used as ultrashort pulses amplifiers
  • Yb:KGW and Yb:KYW are one of the best materials for high power thin disk lasers.

Features:

  • High absorption coefficient at 981 nm
  • High stimulated emission cross section
  • Low laser threshold
  • Extremely low quantum defect  λpump/ λse
  • Broad polarized output at 1023–1060 nm
  • High slope efficiency with diode pumping (~ 60%)
  • High Yb doping concentration.

Custom manufacturing capabilities:

  • Various shapes (slabs, rods, cubes)
  • Different dopant levels
  • Diversified coatings
  • Attractive prices of introductory quantities to OEMs.

Name  Yb:KGW   Yb:KYW  
Yb3+ concentration 0.5-5% 0.5-100%
Crystal structure  manoclinic  manoclinic 
Lattice parameters
 a=8.095Å, b=10.43Å,
c=7.588Å, β=94.43°		 a=8.05Å, b=10.35Å,
c=7.54Å, β=94°  
Thermal expansion
 αa=4X10-6 /°C,αb=3.6X10-6 /°C, 
αc=8.5X10-6 /°C 		 -
Thermal conductivity
 Ka=2.6 W/mK, Kb=3.8 W/mK,
Kc=3.4 W/mK, 		 -
Density 7.25 g/cm3 6.61 g/cm3
Mohs' hardness 4-5 4-5 
Melting temperature 1075 °C - 
Transmission range  0.35-5.5 μm 0.35-5.5 μm 
Refractive indices (λ=1.06 μm)  ng=2.037, np=1.986,
nm=2.033		  -
dn/dt 0.4X10-6 K-1  0.4X10-6 K-1
Laser wavelength 1023-1060 nm  1025-1058 nm 
Fluorescence lifetime 0.3 ms  0.3 ms 
Stimulated emission
cross section (E| |a) 		 2.6X10-20 cm2 3X10-20 cm2 
Absorbtion peak
and bandwidth 		 αa=26 cm-1, λ=981 μm,
Δλ=3.7 nm		 αa=26 cm-1, λ=981μm,
Δλ=3.7 nm
Absorbtion cross section 1.2X10-19 cm2 1.33X10-19 cm2 
Lasing threshold 35 mW 70 mW 
Stark levels energy (in cm-1) of the
2F5/2 manifolds of Yb3+ @ 77K 		  10682, 10471, 10188 10695, 10476, 10187 
Stark levels energy (in cm-1) of the
2F7/2 manifolds of Yb3+ @ 77K 		  535, 385, 163, 0 568, 407, 168, 0 

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