Yb:KGW

Yb:KGW

Ytterbium doped Potassium-Gadolinium Tungstate crystal

is an excellent laser crystal. Its has broad spectral emission band 1023-1060nm which allows to generate ps or fs laser pulses. Its wide absorption spectrum at 980 nm and high absorption of pump radiation allows an efficient use of diode laser pumping. Compared with YAG used as hosts for Yb3+, KGW has the advantage of larger absorption cross section, which decreases the minimum pump intensity necessary to achieve transparency in the quasi-two-level system of ytterbium.

Orientation

 [010]  

Standard Dopant concentration (at.%)

 5%

Length tolerance,mm

+1.0/-0.0

Diameter tolerance,mm

+/-0.1

Parallelism

<30″

Perpendicularity

<15′

Surface quality

20/10

Coating

AR-coated   

 

Crystal structure

monoclinic

Point group

C2/c

Cell Parameters

a = 8.09Å;  b = 10.43Å;  c = 7.588Å 
 β=94.4°

Refractive index, at 1067 nm

ng=2.033;np=2.037;nm=1.986

Mohs hardness

5

Density

7.27g/cm3

Melting Point

1075℃

Thermal conductivity @373K,W/cm/K

K[100] = 0.026; K[010] = 0.038; K[001] = 0.034

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

1023-1060nm

Absorption band

981nm(FWHM 3.7nm)

Fluorescent lifetime

600μs(5% doping)

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