Ho:YAG
Ho ions emit near 2100nm, in the eye-safe band, with high atmospheric transmission. This gives them important application prospects in remote sensing, laser ranging, and lidar. The wavelength of 2100nm also lies at a water-molecule absorption peak strongly absorbed by human tissue. Medical Ho lasers penetrate only tens of micrometers into the body, causing little thermal damage to surrounding tissue, and are therefore widely used in surgery and treatment. Ho lasers can also serve as pump sources. Nonlinear effects in crystals such as ZGP can generate infrared laser output at 3～5um.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Material | Ho: YAG |
| Concentration tolerance | 0.2% ~3%( According to customer requirements ) |
| Orientation | <111> crystallographic orientation |
| Parallelism | <10” |
| Perpendicularity | <5” |
| Surface Quality | 10/5 scratch/dig compliant with MIL-O-13830 B |
| Wavefront distortion [@633nm] | λ/8 per inch @633nm |
| Surface Flatness [@633 nm] | λ/10@ 633 nm |
| Clear Aperture Dimension | >90 |
| Thickness / Diameter Tolerance | Rod diameter: (+ 0, -0.05)mm, (±0.5)mm |
| Crystal Structure | Cubic |
| Lattice constant | 12.01Å |
| Density | 4.56g/cm³ |
| Melting point | 1970°C |
| Thermal conductivity | 14W/m/K, 20°C; 10.5W/m/K, 100°C |
| Thermal shock resistance | 790W/m |
| Thermo-optic coefficient dn / dT | 7.3×10⁻⁶/ K |
| Thermal expansion [@ 25°C / @0~250℃；@ 0~250℃; [110]:7.7×10⁻⁶/K@0~250℃;] | [100]:8.2×10⁻⁶/K@ 0~250℃; [110]:7.7×10⁻⁶/K@0~250℃; |
| Thermal expansion [@ 25°C / @0~250℃] | [111]: 7.8×10⁻⁶/K@0~250℃ |
| Hardness | 8.5 Mohs |
| Young's modulus | 3.17×10⁴Kg/mm² |
| Shear modulus | 310GPa |
| Extinction ratio | >28dB |
| Specific heat [@0-20℃] | 0.59J/g.cm³@0-20℃ |
| Solubility | Insoluble in water; slightly soluble in common acids |
| Poisson's ratio | 0.3 |
| Laser transition | ⁵I₇→⁵I₈ |
| Laser Wavelength | 2.05μm |
| Pump Wavelength | 1908 nm |
| Laser Wavelength | 2090 nm |
| Fluorescence lifetime | 7 ms |
| Quantum Efficiency | 1 |
| Refractive Index [@1.030μm] | 1.82 |
| Upconversion loss coefficient | 1.8, 2.6, 5.3×10⁻¹⁸cm³/s |
Key Features
Datasheet
Supplier Information
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