CTH:YAG Crystals
Ho,Cr,Tm:YAG -yttrium aluminium garnet laser crystals doped with chromium,thulium and holmium ions to provide lasing at 2.13 microns are finding more and more applications,especially in the medical industry.The inherent advantage of the crystal crystal is that it employs YAG as the host. YAG’s physical,thermal and optical properties are well known and understood by every laser designer. It has wide applications in surgery, dentistry, atmospheric testing, etc.
Advantages of CTH:YAG:
• High slope efficiency
• Pumped by flash lamp or diode
• Operates well at room temperature
• Operates in a relatively eye-safe wavelength range
Dopant Ion
| Cr3+ Concentration | 0.85% |
| Tm3+ Concentration | 5.9% |
| Ho3+ Concentration | 0.36% |
Operating Spec
| Emission Wavelength | 2.080 um |
| Laser Transition | 5I7 → 5I8 |
| Flouresence Lifetime | 8.5 ms |
| Pump Wavelength | flash lamp or diode pumped @ 780nm |
Basic Properties
| Coefficient of Thermal Expansion | 6.14 x 10-6 K-1 |
| Thermal Diffusivity | 0.041 cm2 s-2 |
| Thermal Conductivity | 11.2 W m-1 K-1 |
| Specific Heat (Cp) | 0.59 J g-1 K-1 |
| Thermal Shock Resistant | 800 W m-1 |
| Refractive Index @ 632.8 nm | 1.83 |
| dn/dT (Thermal Coefficient of Refractive Index) @ 1064nm | 7.8 10-6 K-1 |
| Melting Point | 1965℃ |
| Density | 4.56 g cm-3 |
| MOHS Hardness | 8.25 |
| Crystal Structure | Cubic |
| Standard Orientation | <111> |
| Y3+ Site Symmetry | D2 |
| Lattice Constant | a=12.013 Å |
| Molecular Weight | 593.7 g mol-1 |
Technical Parameters
| Wavefront Distortion | ≤0.125ʎ/inch@1064nm |
| Rod Sizes | Diameter:3-6mm ,Length:50-120mm, Upon request of customer |
| Dimensional Tolerances | Diameter:±0.05mm Length:±0.5mm |
| Barrel Finish | Ground finish:400#Grit |
| Parallelism | < 30″ |
| Perpendicularity | ≤5′ |
| Flatness | ʎ/10 |
| Surface Quality | 10/5 |
| AR coating Reflectivity | ≤0.25%@2094nm |
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