Cr：BeAl₂O₄
Our Cr:BeAl₂O₄ crystal, also called Alexandrite, is a broadband tunable laser gain medium with excellent overall performance. It is widely used in dermatology, laser aesthetic applications, and radar technology. It features a long fluorescence lifetime, high saturation energy density, and a broad absorption bandwidth. Applications include medical lasers, alexandrite Q-switched lasers, lidar, and alexandrite laser treatment systems.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Chemical formula | Be(Al₁₋ₓCrₓ)₂O₄ |
| Lattice | Orthorhombic |
| Lattice constant | a=5.476Å per ASTM 10-32 b=9.404 Å c=4.427 Å |
| X-ray density | 3.7g/cm³ |
| Melting point | 1870 °C |
| Thermal expansion | ∥a 5.9×10⁻⁶ K⁻¹ ∥b 6.1×10⁻⁶ K⁻¹ ∥c 6.7×10⁻⁶K ⁻¹ |
| Thermal conductivity | 0.23 W cm⁻¹K⁻¹ |
| Vickers | 2000 kg mm⁻² |
| Young's modulus | 469 GPa |
| Fracture stress | 0.457-0.948 GPa |
| Thermal shock resistance | 35-74W/cm |
| Diameter Tolerance | +.000″/-.002″ |
| Clear Aperture Dimension | ≥98% |
| Chamfer [@45°] | 0.005″ ± 0.003″@45° |
| Burnishing | 55±5 μinches |
| Perpendicularity | <5′ |
| Parallelism | <30″ |
| Flatness [@633nm] | λ/10@633nm |
| Surface Quality | 10-5 scratch-dig per MIL-O-13830 |
| Wavefront distortion | Less than λ/2 per inch of length (measured at 1μm) |
| End-face coating | Single-layer MgF₂; single-wavelength and broadband AR coatings |
| Cr doping | Reflection standard range: 0.10–0.17 at.%; optimum chromium concentration: 0.83/d at.% (diameter in mm) |
| Chromium concentration range | 0.01-0.2 at.% |
| Chromium ion concentration [0.1 at.%] | 3.51×10cm⁻³ |
| Refractive Index ( Dual-axis ) [750 nm] | E∥a = 1.7367 E∥b = 1.7421 E∥c = 1.7346 |
| Dopant-site symmetry | 78% mirror (laser active) 22% inversion |
| Nonlinear refractive index，n₂ | ~10⁻¹³ esu |
| Findlay-Clay Insertion Loss | <0.3% cm⁻¹ |
| Temperature dependence of refractive index | 8×10⁻⁶ K⁻¹ |
Key Features
Datasheet
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