Nd:KGW_CASTECH INC.

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Nd:KGW

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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	C_2h(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	n_g = 2.049； n_p = 1.978；n_m = 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^-6K^-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 σ_e(x10^-20cm²)	1.48
	Fluorescent lifetime（μs）	109
	Gain bandwidth	15nm
	Absorption wavelength	810nm
	Absorption bandwidth	14nm
	Absorption cross-section σ_α (x10^-20cm²)	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