Er:YSGG/Er,Cr:YSGG Crystals
Active elements from Erbium doped Yttrium Scandium Gallium Garnet crystals (Er:Y3Sc2Ga3012 or Er:YSGG), single crystals, are desinged for diode pumped solid-state lasers radiating in the 3 µm range. Er:YSGG crystals show the perspectiveness of their application alongside with the widely used Er:YAG, Er:GGG and Er:YLF crystals. Flash lamp pumped solid-state lasers based on Cr,Nd and Cr,Er doped Yttrium Scandium Gallium Garnet crystals (Cr,Nd:Y3Sc2Ga3012 or Cr,Nd:YSGG and Cr,Er:Y3Sc2Ga3012 or Cr,Er:YSGG) have a higher efficiency than those based on Nd:YAG and Er:YAG. Active elements manufactured from YSGG crystals are optimum for medium power pulse lasers with the repetition rates of up to several tens of cycles. The advantages of YSGG crystals compared with YAG crystals are lost when large size elements are used because of the worse thermal characteristics of YSGG crystals.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Crystal structure [Er3+:YSGG] | cubic |
| Dopant concentration [Er3+:YSGG] | 30 – 50 at.% |
| Spatial group [Er3+:YSGG] | Oh10 |
| Lattice constant [Er3+:YSGG] | 12.42 Å |
| Density [Er3+:YSGG] | 5.2 g/cm3 |
| Orientation [Er3+:YSGG] | <001>, <111> |
| Mohs hardness [Er3+:YSGG] | >7 |
| Thermal expansion coefficient [Er3+:YSGG] | 8.1 x 10-6x°K-1 |
| Thermal conductivity [Er3+:YSGG] | 0.079 W x cm-1 x °K-1 |
| Refractive index [Er3+:YSGG；1.064 µm] | 1.926 |
| Termooptical factor (dn/dT) [Er3+:YSGG] | 7 x 10-6 x°K-1 |
| Generated wavelength [Er3+:YSGG] | 2.797; 2.823 |
| Crystal structure [Cr3+,Er3+:YSGG] | cubic |
| Dopant concentration [Cr3+,Er3+:YSGG] | Cr: (1 ÷ 2) x 1020; Er: 4 x 1021 |
| Spatial group [Cr3+,Er3+:YSGG] | Oh10 |
| Lattice constant [Cr3+,Er3+:YSGG] | 12.42 Å |
| Density [Cr3+,Er3+:YSGG] | 5.2 g/cm3 |
| Orientation [Cr3+,Er3+:YSGG] | <001>, <111> |
| Mohs hardness [Cr3+,Er3+:YSGG] | > 7 |
| Thermal expansion coefficient [Cr3+,Er3+:YSGG] | 8.1 x 10-6 x°K-1 |
| Thermal conductivity [Cr3+,Er3+:YSGG] | 0.06 W x cm-1 x °K-1 |
| Lifetime [Cr3+,Er3+:YSGG] | 1400 µs |
| Emission cross-section [Cr3+,Er3+:YSGG] | 5.2 x 10-21 |
| Relative (to YAG) efficiency of transformation of energy of the flash lamp [Cr3+,Er3+:YSGG] | 1.5 |
| Lasing wavelength [Cr3+,Er3+:YSGG] | 2.791 µm |
| Refractive index [Cr3+,Er3+:YSGG] | 1.9263 |
| Termooptical factor (dn/dT) [Cr3+,Er3+:YSGG] | 12.3 x 10-6 x °K-1 |
| Ultimate lasing regimes [Cr3+,Er3+:YSGG] | overall efficiency 2.1% |
| Ultimate lasing regimes [Cr3+,Er3+:YSGG] | overall efficiency 0.16% |
| Free running mode [Cr3+,Er3+:YSGG] | slope efficiency 3.0% |
| Electro-optical Q-switch [Cr3+,Er3+:YSGG] | slope efficiency 0.38% |
| Sizes, (dia x length) [Cr3+,Er3+:YSGG] | from 3 x 30 to12.7 x 127.0 |
| Rod Diameters | up to 15 mm |
| Diameter Tolerance | +0.0000 / -0.0020 in |
| Length Tolerance | +0.040 / -0.000 in |
| Tilt / Wedge Angle | ±5 min |
| Chamfer | 0.005 ±0.003 in |
| Chamfer Angle | 45 deg ±5 deg |
| Barrel Finish | 55 micro-inch ±5 micro-inch |
| Parallelism | 30 arc seconds |
| End Figure [633 nm] | λ / 10 wave at 633 nm |
| Perpendicularity | 5 arc minutes |
| Surface Quality | 10 – 5 scratch-dig |
| Wavefront Distortion | 1/2 wave per inch of length |
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Datasheet
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