Ho: YAG Crystals
Ho:YAG Ho3+ ions doped into insulating laser crystals have exhibited 14 inter-manifold laser channels, operating in temporal modes from CW to mode-locked . Ho:YAG is commonly used as an efficient means to generate 2.1-μm laser emission from the 5I7- 5I8 transition, for applications such as laser remote sensing, medical surgery, and pumping Mid-IR OPO's to achieve 3-5micron emission. Direct diode pumped systems,and Tm: Fiber Laser pumped system have demonstrated hi slope efficiencies, some approaching the theoretical limit.
Basic Properties
| Ho3+ concentration range | 0.005 – 100 atomic % |
| Emission Wavelength | 2.01 um |
| Laser Transition | 5I7 → 5I8 |
| Flouresence Lifetime | 8.5 ms |
| Pump Wavelength | 1.9 um |
| 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 |
| Melting Point | 1965℃ |
| Density | 4.56 g cm-3 |
| MOHS Hardness | 8.25 |
| Young’s Modulus | 335 Gpa |
| Crystal Structure | Cubic |
| Standard Orientation | <111> |
| Y3+ Site Symmetry | D2 |
| Lattice Constant | a=12.013 Å |
Technical Parameters
| Wavefront distortion | L/8per inch @633nm |
| Extinction ratio | >28dB |
| Wavefront distortion | L/8per inch @633nm |
| Extinction ratio | >28dB |
| Tolerance：Rods with diameter | (+0、-0.05)mm,( ±0.5) mm |
| Surface quality | 10/5 Scratch/dig per MIL-O-1380A |
| Parallelism | <10arc seconds |
| Perpendicularity | <5arc minutes |
| Aperture | >90% |
| Flatness | λ/10@ 633 nm |
| Tolerance：Rods with diameter | (+0、-0.05)mm,( ±0.5) mm |
| Surface quality | 10/5 Scratch/dig per MIL-O-1380A |
| Parallelism | <10arc seconds |
| Perpendicularity | <5arc minutes |
| Aperture | >90% |
| Flatness | λ/10@ 633 nm |
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