Cr:BeAlO2
CRYLINK’s Cr:BeAlO2 crystal products, also known as Alexandrite. It is a broadband tunable laser gain medium with excellent comprehensive performance. It is widely used in dermatology, laser cosmetology, radar technology and other fields. The product has the characteristics of long fluorescence life, high saturation energy density and wide absorption bandwidth. It can be used in medical laser, alexandrite Q laser, laser radar, alexandrite laser treatment instrument products.
Product Parameters
Chemical Formula | Be(Al1-xCrx)2O4 |
Crystal 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 6.7×10-6 K-1 |
Thermal Conductivity | 0.23 Wcm-1K-1 |
Hardness（Vickers） | 2000 kgmm-2 |
Yang’s Modulus | 469 GPa |
Fracture Stress | 0.457-0.948 GPa |
Heat Shock Resistance | 35-74W/cm |
Diameter Tolerance | +.000”/-.002” |
Clear Aperture | ≥98% |
Chamfer | 0.005“± 0.003“@45° |
Roll Finish | 55±5 μinches |
Perpendicularity | <5′ |
Parallelity | <30″ |
Flatness | λ/10@633nm |
Surface Finish | 10-5 scratch-dig per MIL-O-13830 |
Wavefront Distortion | Less than λ/2 per inch (measured in 1 micron) |
End Coating | Single-layer MgF2 Single wavelength, broadband AR coating |
Cr Doping | Reflection standard range: 0.10–0.17 at.% Optimal 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 (750 nm) (Two-axis) | E ||a = 1.7367 E ||b = 1.7421 E ||c = 1.7346 |
Doping Position Symmetry | 78% mirror (laser active) 22% inversion |
Nonlinear Refractive Index，n2 | ~10-13 esu |
Findlay-Clay Insertion Loss | <0.3% cm-1 |
Refractive Index Temperature Change | 8×10-6 K-1 |
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| Cr: BeAlO2 absorption coefficient spectrum |
- Excellent quality
- Good uniformity
- Large crystal size
- Strong double refraction
- High damage threshold
- The coating threshold is high
- Small section (high saturation flux)
- Wavelength coverage: 500nm-3000nm
- Low symmetry (orthogonal crystal structure)
- Absorption range 380-630 nm, peak at 410 nm and 590 nm
- Performance is enhanced at higher temperatures (90-150℃)
- Tuning ranges from 700 nm to 860 nm (main laser wavelength 755 nm)
- Laser beauty
- Photochemistry
- Nonlinear optics
- Radar technology
- Defense applications
- Laser medical equipment
- Photoelectric confrontation
- Remote sensing technology
- High-resolution spectroscopy
- Mainly used for long pulses or Q switch 755nm lasers
- Material handling – Alexandrite laser punching, semiconductor treatment
