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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
ß=94.41˚

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,
W x cm-1 x K-1

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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