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Alexandrite rod
Alexandrite (Cr3+:BeAl2O4, chromium-doped beryllium aluminate) is a laser gain material used in solid-state lasers for applications such as dermatology and Lidar, etc. Alexandrite is produced via the Czochralski growth method. It has a thermal shock resistance five times that of Nd:YAG and a wide emission wavelengths typically between 710nm and 800nm – in many cases around 755nm.
It is possible to make broadly wavelength-tunable lasers based on alexandrite. Alexandrite is anisotropic, the absorption and gain properties strongly depend on the direction of pump light’s polarization. This together with the strong birefringence of the material makes it easy to obtain linearly polarized emission with low depolarization losses.
| Formula: | Cr3+:BeAl2O4 |
| Crystal Structure: | Orthorhombic |
| Unit Cell Dimensions (Å) | 5.476(a) x 9.404(b) x 4.427(c) |
| Thermal Expansion (x 10-6 K-1): | 5.9(a), 6.1(b), 6.7(c) |
| Index of Refraction (at 750 nm): | 1.7367(a) x 1.7241(b) x 1.7346(c) |
| Melting Point: | 1870 °C |
| Vickers Hardness: | 2000 kg/mm2 |
| Density: | 3.7 g/cm3 |
| Thermal Conductivity: | 0.23 W/cm•K |
| Young's Modulus: | 469 GPa |
| Thermal Shock Resistance: | 35 - 74W/cm |
| dn/dT: | 8x10-6 K-1 |
Absorption Curve
● Low threshold, High efficiency
| Dimension Tolerance | D(+0/-0.05) * L(+1/-0) mm | ||
| Scratch/Dig | 10/5 | Perpendicularity | <5' |
| Parallelism | <10" | Chips | <0.1mm |
| Flatness | λ/10@633nm | Clear Aperture | ≥98% |
| Rod Ends |
Option 1: Plano-Plano
Option 2: Convex-Plano
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| Coating |
Option 1- Normal : AR@755nm on both ends
Option 2 -Mirror coating: HR@755nm(S1) & PR@755nm(S2)
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| Damage Threshold | > 1.5 Million pulses ( tested by third party) | ||
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Standard Products
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Dia5x115mm, Dia7x110mm, Dia7x125mm
Dia6.35x120mm, Dia8x130mm, Dia9.53x117mm
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