As experts in growing very high-quality crystals for lasers and nonlinear optical crystals and producing high-purity crystal rods in various concentrations, we offer diverse crystal rods designed to meet different application needs and integration requirements. Our crystal rods provide exceptional energy output, ensuring performance and reliability across aesthetic laser industries. We produce Alexandrite (755nm), Nd-YAG (1064nm), Ruby (694nm), and Er-YAG (2940nm).
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Alexandrite Rods (710 nm – 800 nm)
- Wavelength tuning range of 710 nm – 800 nm
- Solid-state laser material with a thermal shock resistance five times that of Nd:YAG
- Lengths: 3 mm – 152.4 mm
- Diameters: 2 mm – 12.7 mm
| Structural & Mechanical Properties | |
|---|---|
| Formula: | Be (Al1-xCrx)2O4 |
| Crystal Structure: | Orthorhombic |
| Unit Cell Dimensions: (contains four formula units) |
a = 5.476 Å per ASTM 10-32 b = 9.404 Å c = 4.427 Å |
| X-Ray Density: | 3.7 g/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 W/cm·K |
| Hardness (Vickers): | 2000 kg/mm² |
| Young’s Modulus: | 469 GPa |
| Fracture Stress: | 0.457 – 0.948 GPa |
| Thermal Shock Resistance: | 35 – 74 W/cm |
| General Specifications | |
|---|---|
| Diameter Tolerance: | +0.000″ / -0.002″ |
| Chamfer: | 0.005″ ± 0.003″ @ 45° |
| Barrel Finish: | 55 ± 5 pinches |
| Perpendicularity: | within 5 arc minutes |
| Parallelism: | 30 arc-seconds or less |
| Rod End Face Flatness: | within λ / 10 wave at 632 nm wavelength |
| Surface Quality: | 10 - 5 scratch-dig per MIL-O-13830 A |
| Wave Front Distortion: | less than 1/2 wave per inch of length (measured at 1 micron) |
| Rod End Coatings: | Single-layer MgF2 Single wavelength and broad band anti-reflection coatings available |
| Cr Concentrations: |
standard range: 0.10 - 0.17 at % special order: < 0.10 or 0.17 - 0.20 at % optimum chrome concentration: 0.83 / d at % (d is laser rod diameter in mm) |
| Optical Properties | |
|---|---|
| Chrome Concentration Range: | 0.01 – 0.2 at % |
| Chrome - ion Density (0.1 at %): | 3.51 × 1019 cm-3 |
| Refractive Indices (750 nm): (Biaxial, Positive) |
E ||a = 1.7367 E ||b = 1.7421 E ||c = 1.7346 |
| Refractive Index Temperature Variation: | 8 × 10-6 K-1 |
| Dopant Site Symmetry: | 78% mirror (laser active) 22% inversion |
| Non-linear Refractive Index, n2: | ~ 10-13 esu |
| Findlay-Clay Insertion Loss: | < 0.3% cm-1 |
Alexandrite Absorption Coefficient
Graph showing absorption (O.D.) vs. wavelength (nm) for E || a-axis and E || b-axis
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VF Photonix, Suite 172 Waterhouse Business Centre, 2 Cromar Way, Chelmsford, Essex CM1 2QE United Kingdom
VF Photonix, P.O Box.3430 – Dubai, UAE