Sapphire Windows/Rods

Sapphire Windows/Rods
Sapphire Windows/Rods Sapphire Windows/Rods Sapphire Windows/Rods

Sapphire is aluminium oxide (Al2O3) single crystal and one of the hardest materials. With its good transmission in the visible and near infrared, high chemical resistance and thermal stability, it is often used as optical windows in a harsh environment. Recently, sapphire windows/rods found a wide use for broadband continuum generation (white light generation) pumped by femtosecond lasers.

Newlight Photonics supplies c-cut (-C) high quality sapphire windows/rods with the minimized birefringence for continuum generation.
Sapphire windows/rods cut along R-axis (-R) or along a random orientation (-RM) are also available.

Application examples:

WB01158_1.GIF (255 bytes) White light from 3 mm sapphire disk to seed NOPA for sub-20 fs visible
  pulses @ 100 kHz

WB01158_1.GIF (255 bytes) Investigation of femtosecond white light generation from sapphire

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Part No. Aperture Thickness Orientation Price Availability Add to Cart

Basic Properties of Sapphire Crystals:

Transparency Range: 180 - 4500 nm

material-sa.GIF (11133 bytes)

Transmission Curve

Crystal Symmetry: Hexagonal
Density:  3.98 g/cm3
Lattice Constants: a=b=4.758 A, c=12.991 A
Thermo-Optic Coefficients:
dn/dT= 1.2 x 10-6 /oC
Optical Homogeneity: Δn < 10-6 /cm
Mohs Hardness:  9.0
Thermal Conductivity: 52  W/m/K
Thermal Expansion Coefficients: α = 8.4 x 10-6/K

Sellmeier Equations: (λ in µm) :
no2=1+ 1.43135λ2/(λ2 - 0.00528) + 0.65055λ2/(λ2- 0.01424)+ 5.34140λ2 /( λ2-325.01800 )  
ne2=1+ 1.50398λ2/(λ2 - 0.00548) + 0.55069λ2/(λ2-0.01480 )+ 6.59274λ2/( λ2-402.89500 )

Wavelength (nm) no ne Birefringence
(Δn=ne -no)
Walk-off Angle
 at 45°
1064 1.7545 1.7467 -0.0275 0.257°
800 1.7602 1.7522 -0.0278 0.258°
632.8 1.7659 1.7579 -0.0283 0.261°
532 1.7717 1.7636 -0.0288 0.263°
355 1.7960 1.7873 -0.0310 0.276°
266 1.8331 1.8236 -0.0346 0.296°

Crystallographic orientations:




Specifications of Sapphire Windows:

Orientation: c-cut (-C), R-cut (-R, 1-102 ), Random cut (-RM)
or as specified
Dimension Tolerance: ± 0.1 mm
Clear Aperture: > 85% central area
Flatness: <  λ/4 @ 633 nm for T >= 1 mm, <  λ @ 633 nm for T < 1 mm
Surface Quality: Scratch/Dig 40/20 per MIL-O-13830A
Parallelism: better than 1 arc minute
Perpendicularity: 3 arc minutes
Transmission Wavefront Distortion: < λ/4 @632.8 nm
Bevel: < 0.25 mm X 45°

Crystallographic orientations of sapphire crystal:


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