Yb:KGW(Ytterbium-Doped Potassium Gadolinium Tungstate) is a premium laser gain material known for its exceptional performance in laser applications. With a broad spectral emission band of 1023-1060 nm, it is ideal for generating short (ps or fs) laser pulses. Its wide absorption spectrum at 980 nm ensures efficient use of diode laser pumping, and it outperforms traditional Nd³?-doped materials in several aspects.

Key Features

• High Absorption Coefficient: Excellent at 981 nm, enhancing pump radiation absorption
• Broad Spectral Emission: Emission range of 1023-1060 nm, suitable for short pulse lasers
• Low Laser Threshold: Requires less energy to initiate lasing
• Low Quantum Defect: Minimizes energy loss in the lasing process
• High Slope Efficiency: Optimized for diode pumping
• High Yb Doping Concentration: Increased efficiency and performance

Basic Properties

• Crystal Structure: Monoclinic
• Point Group: C2/c
• Lattice Parameters: a= 8.09 Å, b= 10.43 Å, c= 7.588 Å, β= 94.4°
• Refractive Index @1067 nm: ng= 2.033, np= 2.037, nm= 1.986
• Melting Point: 1075 ?
• Mohs Hardness: 5
• Density: 7.27 g/cm³
• Thermal Conductivity at 373 K: K[100] = 2.6 W/m/K, K[010] = 3.8 W/m/K, K[001] = 3.4 W/m/K
• Thermal Expansion Coefficients at 373 K: α[100] = 4×10^-6 /K, α[010] = 1.6×10^-6 /K, α[001] = 8.5×10^-6 /K
• Lasing Wavelength: 1023-1060 nm
• Absorption Band: 981 nm (FWHM 3.7 nm)
• Fluorescent Lifetime: 600 μs (5% doping)

Specifications

• Orientation: [010]
• Standard Dopant Concentration: Yb: 5 at.%
• Maximum Length: 50 mm
• Dimensional Tolerances: Diameter: ±0.1 mm, Length: ±0.5 mm
• Surface Quality (Scratch/Dig): 20/10 to MIL-PRF-13830B
• Flatness: λ/6 @633 nm
• Parallelism: 20 arc sec
• Perpendicularity: ?15 arc min
• Coating: AR-1030/980 nm, R < 0.2% @1030 nm, R < 0.5% @980 nm. Custom coatings available upon request

CASTECH's Yb:KGW offers superior performance for high-efficiency and high-power laser applications, setting new standards in the industry.