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Nd:KGW
- 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.
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Basic Properties:
Crystal structure |
monoclinic |
Space group |
C2h(2/c)-C 2/c |
Cell Parameters |
a=8.087Å; b=10.374 Å;c=7.588 Å |
Refractive index, at 1067 nm |
ng = 2.049; np = 1.978;nm = 2.014 |
Mohs hardness |
5 |
Density |
7.27g/cm3 |
Melting Point |
1075℃ |
Thermal conductivity @ 373K, |
K[100] = 0.026;K[010] = 0.038;K[001] = 0.034 |
Young's modulus,GPa |
E[100] = 115.8;E[010] = 152.5;E[001] = 92.4 |
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 |
911nm,1067nm,1351nm |
Absorption band |
808nm (FWHM 12nm) |
Fluorescent lifetime |
110μs (3% doping), 90μs (8% doping) |
Laser Properties:
3%Nd:KGW |
Emission wavelength |
1070nm |
Emission bandwidth |
15nm |
|
Stimulated emission cross-section σe(x10-20 cm2) |
1.48 |
|
Fluorescent lifetime(μs) |
109 |
|
Gain bandwidth |
15nm |
|
Absorption wavelength |
810nm |
|
Absorption bandwidth |
14nm |
|
Absorption cross-section σα (x10-20 cm2) |
1.28 |
Specifications of Nd:KGW:
Orientation |
[010] |
Standard Dopant concentration(at.%) |
3%,5%,8% |
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 |
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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