Yb:KGW
Yb³⁺:KGd(WO₄)₂ (Yb:KGW) is among the most promising laser-active materials. Yb:KGW may replace Nd:YAG and Yb:YAG in high-power diode-pumped laser systems and offers strong potential for high-power, short-pulse femtosecond lasers and their applications. Yb3:KGW has a large absorption coefficient, a low quantum defect and high absorption and emission cross sections. The simple two-level electronic structure of Yb ions avoids undesirable losses from upconversion, excited-state absorption and concentration quenching. Compared with common Nd:YAG crystals, Yb:KGW offers broader absorption bandwidth, a 3-4 times longer emission lifetime, higher storage capacity and a lower quantum defect, making it better suited to diode pumping. A smaller Stokes shift reduces heating and improves laser efficiency. Compared with Yb-doped crystals such as Yb:YAG and Yb:YCOB, Yb:KGW has a 13-17 times higher absorption cross section, a lower quantum defect (~4%), an emission cross section 9 times that of Yb:YCOB, a broader emission band than Yb:YAG, a high nonlinear refractive index and slope efficiency up to 87%.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Chemical formula | Yb³⁺：KGd（WO₄）₂ |
| Crystal Structure | Monoclinic double tungstate |
| Density | 7.27 g/cm³ |
| Transmission range | 0.35-5.5 μm |
| Mohs hardness | 4 to 5 |
| Refractive index at 1060 nm | n_g = 2.037, nₚ = 1.986, nₘ=2.033 |
| Thermal conductivity | Kₐ=2.6 W/mK, K_b=3.8 W/mK, K_c=3.4 W/mK |
| Thermo-optic coefficient [@1064 nm] | dnₚ/dT=-15.7 * 10⁻⁶ K⁻¹ |
| Thermo-optic coefficient [@1064 nm] | dnₘ/dT=-11.8 * 10⁻⁶ K⁻¹ |
| Thermo-optic coefficient [@1064 nm] | dn_g/dT=-17.3 * 10⁻⁶ K⁻¹ |
| Thermal expansion | αₐ=4X10⁻⁶ /°C |
| Thermal expansion | α_b=3.6X10⁻⁶ /°C |
| Thermal expansion | α_c=8.5X10⁻⁶ /°C |
| Melting point Temperature | 1075 °C |
| Laser Wavelength | 1023-1060 nm |
| Laser threshold | 35 mW |
| Unperturbed energy levels of the Yb3+ 2F₅/₂ manifold at 77 K | 10682, 10471, 10188 |
| Stark energy levels of the Yb3+ 2F₇/₂ manifold at 77K (in cm-1) | 535, 385, 163, 0 |
| Optical damage threshold ，GW | 20 cm2 |
| Absorption peak wavelength ，lpump | 981.2 nm |
| Absorption Linewidth ，Dlpump | 3.7 nm |
| Peak Absorption coefficient | 26 cm⁻¹ |
| Emission wavelength ，lse | 1023 nm |
| Emission linewidth ，Dlse | 20 nm |
| lse | 0.959 nm |
| Fluorescence lifetime ，tem | 0.6 ms |
Key Features
Datasheet
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