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:

White light from 3 mm sapphire disk to seed NOPA for sub-20 fs visible
pulses @ 100 kHz
Investigation of femtosecond white light generation from sapphire

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Part No.	Description	Application	Material	Wavelength	Bandwidth	Size	Aperture	Thickness	Length	Angle	Doping	Orientation	Displacement	Retardation	Delay	Coating	End cut	Holder	Price	Availability	Add to Cart

Basic Properties of Sapphire Crystals:

Transparency Range: 180 - 4500 nm		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) : n_o²=1+ 1.43135λ²/(λ² - 0.00528) + 0.65055λ²/(λ²- 0.01424)+ 5.34140λ² /( λ²-325.01800 ) n_e²=1+ 1.50398λ²/(λ² - 0.00548) + 0.55069λ²/(λ²-0.01480 )+ 6.59274λ²/( λ²-402.89500 )
Wavelength (nm)	n_o	n_e	Birefringence (Δn=n_e -n_o)	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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