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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 |
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Mohs hardness |
5 |
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Density |
7.27g/cm3 |
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Melting Point |
1075℃ |
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Thermal conductivity @ 373K, |
K[100] = 0.026；K[010] = 0.038；K[001] = 0.034 |
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Young's modulus，GPa |
E[100] = 115.8；E[010] = 152.5；E[001] = 92.4 |
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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 |
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Lasing Wavelength |
911nm，1067nm，1351nm |
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Absorption band |
808nm (FWHM 12nm) |
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Fluorescent lifetime |
110μs (3% doping), 90μs (8% doping) |
Laser Properties：
|
3%Nd:KGW |
Emission wavelength |
1070nm |
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Emission bandwidth |
15nm |
|
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Stimulated emission cross-section σe(x10-20 cm2) |
1.48 |
|
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Fluorescent lifetime（μs） |
109 |
|
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Gain bandwidth |
15nm |
|
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Absorption wavelength |
810nm |
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Absorption bandwidth |
14nm |
|
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Absorption cross-section σα (x10-20 cm2) |
1.28 |
Specifications of Nd:KGW：
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Orientation |
[010] |
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Standard Dopant concentration（at.%） |
3%，5%，8% |
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Maximum length |
50mm |
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Length tolerance，mm |
+1.0/-0.0 |
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Diameter tolerance，mm |
+/-0.1 |
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Parallelism |
＜30″ |
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Perpendicularity |
＜15′ |
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Surface quality |
20/10 |
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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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Laser Crystals_Nd_KGW.pdf
