SF11 Windows/Rods

SF11 is dense flint glass with excellent chemical and physical properties. It has a good transmission in visible and near IR similar to BK7. But its higher index and dispersion makes it unique in fabrication of lenses with minimized aberrations and prisms/windows/rods with large dispersions. In ultrafast optics, SF11 rods are commonly used as pulse stretchers due to its large dispersion.

Newlight Photonics offers circular/rectangular SF11 windows or rods with thickness from 0.15 mm to 150 mm.

Various high quality HR, AR, and partial reflective coatings are available on SF11 faces.

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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 SF11 and N-SF11 Glass:

	SF11	N-SF11 (RoHS)
Transparency Range	410 - 2000 nm	410 - 2000 nm
Density	4.8 g/cm³	3.2 g/cm³
Thermo-Optic Coefficients (dn/dT)	6.6 x 10^-6 /^oC	-2.1 x 10^-6 /^oC
Optical Homogeneity	Δn < 10^-4 /cm	Δn < 10^-4 /cm
Mohs Hardness	~ 5.0	~ 6.0
Abrasion Aa	N/A	187
Thermal Expansion Coefficient	8.2 x 10^-6/K	9.4 x 10^-6/K
Thermal Conductivity	0.74 W/m/K	0.95 W/m/K
Sellmeier Equations (λ in μm):	n²=1+1.73848λ²/( λ² - 0.013607 ) +0.31117λ²/(λ²-0.061596)+1.17491 λ²/(λ²-121.92271)	n²=1+1.73760λ²/( λ² - 0.013189)+ 0.31375λ²/(λ²-0.062307)+1.89878 λ² /(λ²-155.23629)
Wavelength (nm)	Refractive Index
1550	1.7447	1.7434
1320	1.7486	1.7478
1064	1.7543	1.7539
800	1.7648	1.7646
632.8	1.7786	1.7786
532	1.7948	1.7948

Transmission curve:

Specifications of SF11 Windows:

Dimension Tolerance:	Diameter: ± 0.1 mm, Thickness: ± 0.1 mm (T=<5mm), +0.5/-0.1 mm (T>5mm)
Clear Aperture:	> 85%
Surface Quality:	20/10 Scratch and Dig
Parallelism:	< 1 arc min
Flatness:	λ/6 @ 632.8 nm for T>=2mm
Transmission Wavefront Distortion:	< λ/8 @ 632.8 nm for T=<25mm < λ/8 @ 632.8 nm per 25mm for T>25mm
Bevel:	< 0.25 mm X 45°

N-SF11, the RoHS version of standard SF11 may be used for the windows without notice. N-SF11 will always be used for EU customers in compliance with the RoHS regulations. Please let us know if N-SF11 and SF11 have to be distinguished for your applications.

Coatings:

Various high quality HR, AR, Broadband AR (BBAR) and partial reflective (PR) coatings are also available upon request.

AR Coatings: R<0.2% at the central wavelength
HR Coatings: R>99.6% at the central wavelength
PR Coatings: R=3-95% at the specified wavelength
Broadband AR: R<1% over the specified range

Broadband coating centered @ 800 nm (BBAR@800 nm):

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