仕様

Structural & Thermal Properties​

Formula ​Cr3+: Al2O3
​Crystal System ​Trigonal
​Unit Cell Dimensions (as if hexagonal) ​a = 4.785 Å c = 12.99 Å
X-Ray Density ​3.98 g/cm3
​Melting Point ​2040°C
​Thermal Expansion: at 323 K ​┴ c 5 x 10-6 K-1
|| c 6.7 x 10-6 K-1
Thermal Conductivity: 300K​ ​28 W / m•K
Hardness ​Mohs: 9, Knoop: 2000 kg mm-2
​Young’s Modulus ​345 GPa
​Specific Heat: at 291K ​761 J kg-1 K-1
​Thermal Stress Resistance parameter, RT ​34 W / cm

General Specifications​

Diameter Tolerance ​+0.000” / -0.002”​
​​Chamfer 0.005” ± 0.003” @ 45°​
​Barrel Finish ​30 ± 5 µinches
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)​
​Standard Coating Anti-Reflection where R < 0.25% @ 694 nm​
Laser rod orientation: 60 ± 5° from the c-axis

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