KGW Crystal Body
KGW crystal has two relatively large Raman modes related to pump polarization, located at 768cm^-1 and 901cm^-1 respectively. This means that when pump light irradiates the KGW crystal, frequency shifts of Stokes light and anti-Stokes light are generated, and their frequency shifts correspond to the frequencies of these two Raman modes. This property enables the KGW crystal to convert the frequency of the pump light to a specific Raman shift frequency, thereby achieving frequency conversion and extension of the laser. The relatively broad Raman linewidth means that the crystal can cover a certain range of frequencies during the Raman conversion process, which is conducive to achieving broadband frequency conversion and spectral extension.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Chemical Formula | KGd(WO₄)₂ |
| Crystal Structure | MonoclinicSystem |
| Space group | C2/c |
| Unit cell parameters | a=0.809nm,b=1.043nm,c=0.758nm |
| Transparency | 0.3~5μm |
| Density | 7.27g/cm³ |
| Mohs Hardness | 4-5Mohs |
| Melting Point | 1087°C |
| Phase transition temperature | 1031°C |
| Thermal Conductivity | Ka=2.6W/(m·K);Kb=3.8W/(m·K);Kc=3.4W/(m·K) |
| Dephasing time | 2ps |
| Thermo-optic Coefficient(DN/dt) | Dnp/dt=-15.7×10⁻⁶/K;DNm/dt=-11.8×10⁻⁶/K;Dng/dt=-17.3×10⁻⁶/K |
| Refractive Index(@1064nm) | np=1.982;nm=2.010;ng=2.061 |
| Raman shift | 767cm⁻¹(p[gg]p);901cm⁻¹(p[mm]p) |
| Raman linewidth | 6.4cm⁻¹@767cm⁻¹(p[gg]p);5.4cm⁻¹@901cm⁻¹(p[mm]p) |
| Laman Gains | 11cm/GW@532nm;3cm/GW@1064nm |
| Orientation | [010] |
| Maximum Length | 50mm |
| Dimensional Tolerance | Diameter tolerance: ±0.1mm; length tolerance ±0.5mm |
| Effective clear aperture | 90% |
| Technical indicator photopurity | 10/5 |
| Surface Figure | <λ/6@633nm |
| Parallelism | 20″ |
| Coating | Coating customizable per customer requirements |
Datasheet
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