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Yb:KGW Laser Crystal
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. Yb:YAG's 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.
Yb:KGW Basic Properties
Crystal structure: monoclinic
Point group: C2/c
Cell Parameters: a = 8.09; b = 10.43; c = 7.588; β=94.4°
Refractive index at 1067nm:
nq = 2.033; np = 2.037; nm = 1.986
Mohs hardness: 5
Density, g/cm³: 7.27
Melting Point: 1075°C
Thermal conductivity at 373K: K[100] = 0.026;
K[010]= 0.038; K[001] = 0.034 W/cm/K
Termal expansion coefficient: at 373K a[100] = 4 x 10E-6;
a[010]= 1.6 x 10E-6; a[001]= 8.5 x 10E-6 /K
Lasing Wavelength: 1023-1060 nm
Absorption band : 981 nm(FWHM 3.7nm)
Fluorescent lifetime: 600 µs (5% doping)
Specifications of Yb:KGW
Orientation: [010]
Standard Dopant concentration: 5%atm
Maximum length: 50 mm
Length tolerance: +1.0 / -0.0 mm
Diameter tolerance: +/-0.1 mm
Parallelism: < 30 arcsec.
Perpendicularity: < 15 arc min.
Surface quality: 20/10 (MIL-PRF-13830B)
coating: AR-coated