Overview of Ytterbium Doped Potassium Gadolinum Tungstate (Yb:KGW)
Yb:KGW (Ytterbium Doped Potassium Gadolinium Tungstate) is an exceptional laser gain material, outperforming traditional Nd3+-doped materials. With a broad emission band from 1023 to 1060 nm, it is ideal for generating short (ps or fs) laser pulses. The wide absorption spectrum at 980 nm ensures efficient diode laser pumping, while its high absorption coefficient allows for reduced pump intensity, improving overall system efficiency.

Key Features:

• Broad Emission Spectrum: 1023–1060 nm, suitable for short-pulse lasers
• Efficient Diode Pumping: High absorption at 980 nm and excellent pump radiation absorption
• High Absorption Coefficient at 981 nm
• Low Laser Threshold: Reduces energy input requirements for lasing
• Extremely Low Quantum Defect: Enhances overall efficiency
• High Slope Efficiency: Optimized for diode pumping
• High Yb Doping Concentration: Maximizes gain performance

Crystal Properties and Specifications:

• Crystal Structure: Monoclinic
• Point Group: C2/c
• Lattice Parameter: a = 8.09 Å, b = 10.43 Å, c = 7.588 Å, β = 94.4°
• Refractive Index at 1067 nm: ng = 2.033, np = 2.037, nm = 1.986
• Melting Point: 1075°C
• 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??/K, α[010] = 1.6×10??/K, α[001] = 8.5×10??/K
• Fluorescent Lifetime: 600 μs (5% doping)

Product Specifications:

• Orientation: [010]
• Standard Dopant Concentration: 5 at.% Yb
• 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 Options: AR-1030/980 nm with R < 0.2% at 1030 nm, R < 0.5% at 980 nm. Other coatings available upon request.

Applications:

• Laser Pulses: Ideal for short-pulse laser generation
• Diode-Pumped Lasers: Suitable for efficient diode pumping systems
• High-Efficiency Laser Systems: For applications requiring low threshold and high slope efficiency

CASTECH's Yb:KGW is a superior choice for high-performance laser applications, offering efficiency, versatility, and customization to meet your specific needs.