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Yb:KGW - Ytterbium Doped Potassium Gadolinum Tungstate
- Yb:KGW, as an excellent laser gain material, has wide absorption spectrum at 980 nm and high absorption of pump radiation. Its broad spectral emission band 1023-1060 nm applies to short pulses lasers.
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Introduction
Ytterbium doped Potassium Gadolinium Tungstate (Yb:KGd(WO4)2 or Yb:KGW) is an excellent laser gain material which has important advantages over the widely used Nd3+ doped materials. Its broad spectral emission band 1023-1060 nm allows the generation of short (ps or fs) laser pulses. Its wide absorption spectrum at 980 nm and high absorption of pump radiation allow 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.
CASTECH's Yb: KGW is featured by
- High absorption coefficient @ 981nm
- High stimulated emission cross section
- Low laser threshold Extremely low quantum defect
- Broad polarized output at 1023–1060 nm
- High slope efficiency with diode pumping
- High Yb doping concentration
Table 1. Basic Properties
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Crystal Structure |
Monoclinic |
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Point Group |
C2/c |
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Lattice Parameter |
a = 8.09 Å, b = 10.43 Å, c = 7.588Å, β = 94.4° |
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Refractive Index, at 1067 nm |
ng = 2.033, np = 2.037, nm = 1.986 |
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Melting Point |
1075 ℃ |
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Mohs Hardness |
5 |
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Density |
7.27 g/cm3 |
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Thermal Conductivity at 373 K |
K[100] = 0.026 W/m/K, K[010] = 0.038 W/m/K; K[001] = 0.034 W/m/K |
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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 |
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Lasing Wavelength |
1023-1060 nm |
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Absorption Band |
981 nm (FWHM 3.7 nm) |
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Fluorescent Lifetime |
600 μs (5% doping) |
Table 2. Specifications
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Orientation |
[010] |
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Standard Dopant Concentration |
Yb: 5 atm % |
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Maximum Length |
50 mm |
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Dimensional Tolerances |
Diameter: ±0.1mm Length: ±0.5 mm |
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Surface Quality (Scratch/Dig) |
20/10 to MIL-PRF-13830B |
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Flatness |
λ/6 @633 nm |
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Parallelism |
20 arc sec |
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Perpendicularity |
≦ 15 arc min |
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Coating |
AR-1030/980 nm, R < 0.2% @1030 nm, R < 0.5% @980 nm. Other coatings are available upon request. |
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Laser Crystals_Yb_KGW.pdf
Size:2020-11-19 10:58:31
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