Neodymium doped Potassium-Gadolinium Tungstate crystals (Nd:KGd(WO4)2 or Nd:KGW) is an excellent laser gain material which has low laser oscillations threshold and higher emission section. The fluorescent concentration quench effect of the Nd3+ ion in the KGW crystal may be weakened due to the W-O covalent bond, so this crystal has a higher doping concentration of active ion. Furthermore, the absorption band at 808nm of Nd3+ in the KGW which has 12nm FWHM is well matched with the emission wavelength of current commercial laser diode.
a=8.087?； b=10.374 ?；c=7.588 ?
Refractive index, at 1067 nm
ng = 2.049； np = 1.978；nm = 2.014
Thermal conductivity @ 373K,
K = 0.026；K = 0.038；K = 0.034
E = 115.8；E = 152.5；E = 92.4
Thermal expansion coefficient, @ 373K
α = 4 x 10-6 K-1; α = 1.6 x 10-6 K-1; α = 8.5 x 10-6 K-1
808nm (FWHM 12nm)
110μs (3% doping), 90μs (8% doping)
Stimulated emission cross-section σe(x10-20 cm2)
Absorption cross-section σα (x10-20 cm2)
Specifications of Nd:KGW：
Standard Dopant concentration（at.%）
Figure 1. Transparency curve of Nd:KGW
Figure 2. Emission spectra of 3%Nd:KGW Figure 3. Absorption spectra of 3%Nd:KGW
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