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Introduction
Neodymium doped Potassium-Gadolinium Tungstate
crystal (Nd:KGd(WO 4 ) 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 Nd 3+ 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 Nd 3+ in the KGW which has
12nm FWHM is well matched with the emission wavelength of
current commercial laser diode. 
 High slope efficiency
May be flash lamp or diode pumped
Operates well at room temperature
Operates in a relatively eye-safe wavelength range
Basic Properties:
| Crystal structure |
monoclinic |
| Space group |
C 2h (2/c)-C2/c |
| Cell Parameters |
a = 8.087°; b = 10.374 °; c
= 7.588 °, Z=94.41° |
| Refractive index, at
1067 nm |
n q = 2.049; n p = 1.978; n m = 2.014
|
| Mohs hardness |
5 |
| Density, |
7.27 g/cm 3 |
| Melting Point: |
1075° C |
| Thermal conductivity
at 373°K, W x cm -1 x °K -1 |
K [100] = 0.026; K [010]= 0.038;
K [001] = 0.034 |
| Young's modulus, GPa
|
n 0 =1.972, n e =2.192
|
| Thermal expansion coefficient,
at 373°K (°K -1 ) |
a [100] = 4 x 10 -6 ; a [010] = 1.6
x 10 -6 ;a [001] = 8.5 x 10 -6 |
| Lasing Wavelength |
911nm,1067nm,1351nm |
| Absorption band |
808nm(FWHM 12nm) |
| Fluorescent lifetime
|
110 µs (3% doping), 90 µs (
8% doping |
Nd:KGW's Specifications:
| Orientation |
[010] |
| Standard Dopant |
3%, 5%, 8% |
| Wavefront Distortion |
<?/4 per inch @633nm |
| Parallelism |
<20 arc seconds |
| Perpendicularity |
<5 arc minutes |
| Surface Quality |
10/5 |
| End Coating |
R<0.2% |
| Surface Flatness |
l/8@632.8nm
|
| Maximum length |
50mm |
Note: The other specification and dimension is available
too |
Laser Crystals