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Yb:KGW

Ytterbium doped Potassium-Gadolinium Tungstate crystals - (Yb:KGd(WO4)2 or Yb:KGW) is an excellent laser gain material which has important advantages over the widely used Nd3+ doped materials. Its broad spectral emission band 1023-1060nm allows the generation of short (ps or fs) laser pulses. Its wide absorption spectrum at 980 nm and high absorption of pump radiation allow an efficient use of diode laser pumping. Compared with YAG used as hosts for Yb3+, KGW has the advantage of larger absorption cross section, which decreases the minimum pump intensity necessary to achieve transparency in the quasi-two-level system of ytterbium.
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Basic Properties of Yb:KGW:

Crystal structure monoclinic
Point group C2/c
Cell Parameters a = 8.09Å;  b = 10.43Å;  c = 7.588Å
 β=94.4°
Refractive index, at 1067 nm ng=2.033;np=2.037;nm=1.986
Mohs hardness 5
Density 7.27g/cm3
Melting Point 1075℃
Thermal conductivity @373K,W/cm/K K[100] = 0.026; K[010] = 0.038; K[001] = 0.034
Thermal expansion coefficient @373K α[100] = 4 x 10-6 K-1; α[010] = 1.6 x 10-6 K-1;
 α [001] = 8.5 x 10-6 K-1
Lasing Wavelength 1023-1060nm
Absorption band 981nm(FWHM 3.7nm)
Fluorescent lifetime 600μs(5% doping)

 

 

Specifications of Yb:KGW:

Orientation [010]
Standard Dopant concentration(at.%)  5%
Maximum length 50mm
Length tolerance,mm +1.0/-0.0
Diameter tolerance,mm +/-0.1
Parallelism <30″
Perpendicularity <15′
Surface quality 20/10
coating AR-coated                

 

 

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