Discontinued (Discontinued) CY2256 Ytterbium-doped Potassium-Gadolinium Tungstate Crystal (Yb:KGW)

Catalogue Number	CY2256
Crystal Structure	Tetragonal

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Material Specifications
Chemical Formula	Potassium-Gadolinium Tungstate
Crystal Structure	monoclinic double tungstate
Density	7.27 g/cm³
Transmission Range	0.35–5.5 µm
Mohs Hardness	4 to 5
Refractive Indices at 1060 nm	ng = 2.037, np = 1.986, nm = 2.033
Optical and Thermal Properties
Thermal Conductivity	Ka = 2.6 W/mK, Kb = 3.8 W/mK, Kc = 3.4 W/mK
Thermo-optic Coefficient @1064 nm	dnp/dT = -15.7 × 10⁻⁶ K⁻¹
	dnm/dT = -11.8 × 10⁻⁶ K⁻¹
	dng/dT = -17.3 × 10⁻⁶ K⁻¹
Thermal Expansion	αa = 4×10⁻⁶ /°C
	αb = 3.6×10⁻⁶ /°C
	αc = 8.5×10⁻⁶ /°C
Melting Temperature	1075 °C
Absorption Cross-Section	1.2×10⁻¹⁹ cm²
Stimulated Emission Cross-Section (E\|\|a)	2.6×10⁻²⁰ cm²
Laser Wavelength	1023–1060 nm
Laser Threshold	35 mW
Energy of the Stark Levels (in cm⁻¹) of the 2F5/2 Manifolds of Yb3+ at 77 K	10 682, 10 471, 10 188
Energy of the Stark Levels (in cm⁻¹) of the 2F7/2 Manifolds of Yb3+ at 77 K	535, 385, 163, 0
Optical Damage Threshold, GW/cm²	20

Material specifications
Chemical formula	potassium gadolinium tungstate
Crystal structure	monoclinic double tungstates
Density	7.27 g/cm3
Transmission range	0.35-5.5 μm
Mohs hardness	4 to 5
Refractive indices at 1060 nm	ng = 2.037, np = 1.986, nm=2.033
Optical and thermal properties
Thermal conductivity	Ka=2.6 W/mK, Kb=3.8 W/mK, Kc=3.4 W/mK
Thermal optical coefficient @1064 nm	dnp/dT=-15.7 * 10-6 K-1
	dnm/dT=-11.8 * 10-6 K-1
	dng/dT=-17.3 * 10-6 K-1
Thermal expansion	αa=4X10-6 /°C
	αb=3.6X10-6 /°C
	αc=8.5X10-6 /°C
Melting temperature	1075 °C
Absorption cross-section	1.2X10-19 cm2
Stimulated emission cross-section (E\| \|a)	2.6X10-20 cm2
Laser wavelength	1023-1060 nm
Lasing threshold	35 mW
Stark levels energy (in cm-1) of the 2F5/2 manifolds of Yb3+ @ 77 K	10682, 10471, 10188
Stark levels energy (in cm-1) of the 2F7/2 manifolds of Yb3+ @ 77K	535, 385, 163, 0
optical damage threshold, GW/cm2	20

Discontinued (Discontinued) CY2256 Ytterbium-doped Potassium-Gadolinium Tungstate Crystal (Yb:KGW)

Description of the Ytterbium-doped Potassium-Gadolinium Tungstate Crystal

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