Cr: BeAlO2

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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 a long fluorescence life, high saturation energy density and wide absorption bandwidth. It can be used in medical laser, alexandrite Q laser, laser radar, and alexandrite laser treatment instrument products.

Features of Cr:BeAlO2:

  • 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: 500 nm-3000 nm
  • 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)

Standard

Diameter Tolerance+.000″/-.002″
Clear Aperture
≥98%
Chamfer
0.005″ ± 0.003″@45°
Barreling55±5 μinches
Perpendicularity
<5′
Parallelism
<30″
Flatnessλ/10@633nm
Surface Finish
10-5 scratch-dig per MIL-O-13830
Wavefront Distortion
Less than λ/2 per inch (measured in 1μm)
Facet CoatingSingle-layer MgF2
Single wavelength,broad band
AR coating
Cr DopingStandard range of reflection: 0.10–0.17 at.%
Optimum Cr concentration: 0.83/d at.% (diameter in mm)

Physical and Chemical Properties

Chemical Formula
Be(Al1-xCrx)2O4
Crystal Structure
Orthorhombic
Lattice Constant
a=5.476Å per ASTM 10-32
b=9.404 Å
c=4.427 Å
X-ray Densitometer
3.7g/cm3
Melting Point
1870 °C
Thermal Expansivity
∥a 5.9×10-6 K-1
∥b 6.1×10-6 K-1
∥c 6.7×10-6-1
Thermal Conductivity
0.23 W cm-1K-1
Hardness(Vickers)2000 kg mm-2
Young's Modulus
469 GPa
Breaking Stress0.457-0.948 GPa
Thermal Shock Resistance35-74W/cm

Doping Parameters

Chromium Concentration Range0.01-0.2 at.%
Chromium Ion Concentration (0.1 at.%)3.51×10cm-3
Refractive Index (750 nm) (biax)E∥a = 1.7367
E∥b = 1.7421
E∥c = 1.7346
Doping Position Symmetry78% mirror (laser active)
22% inversion
Nonlinear Refractivity,n2~10-13 ESU
Findlay Clay Insertion Loss
<0.3% cm-1
Refractive Index Temperature Change8×10-6 K-1

Spectrum

Cr:BeAlOsub2sub absorption curve
Cr:BeAlO2 absorption curve

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