Common Specifications
Lens Shape	Plano / Concave
Substrate Material	N-SF11
Wavelength Range*	420 nm - 2.3 μm (Uncoated)
Diameters Available	6 mm, 9 mm, 1/2", or 1"
Diameter Tolerance	+0.00/-0.10 mm
Thickness Tolerance	±0.1 mm
Focal Length Tolerance	±1%
Design Wavelength	587.6 nm
Index of Refraction @ 633 nm	1.778
Abbe Number	v_d=25.76
Surface Quality	40-20 Scratch-Dig
Surface Flatness (Plano Side)	λ/2
Spherical Surface Power (Concave Side)**	3λ/2
Surface Irregularity (Peak to Valley)	λ/4
Centration	≤3 arcmin
Clear Aperture	>90% of Diameter
Focal Length Tolerance	±1%

*These lenses are also available with an AR coating for the 350 - 700 nm range, the 650 - 1050 nm range, or the 1050 - 1620 nm range..
**Much like surface flatness for flat optics, spherical surface power is a measure of the deviation between the surface of the curved optic and a calibrated reference gauge, typically for a 633 nm source, unless otherwise stated. This specification is also commonly referred to as surface fit.

Features

Material: N-SF11
Wavelegnth Range: 420 nm - 2.3 μm (Uncoated)
Choose from 4 Diameters: 6 mm, 9 mm, 1/2", or 1"
Offers Better Chemical Resistance than N-BK7

These Plano-Concave lenses, which are fabricated from N-SF11 glass, are uncoated. N-SF11 glass, a RoHS complient version of SF11, is most commonly used in harsh environments since it is inert to biological degradation and resistant to naturally encountered chemicals, alkalis, and acids. With an uncoated wavelength range of 420 nm - 2.3 μm, N-SF11 also offers a usage range that is slightly shifted to the red compared to N-BK7, which is our RoHS-compliant BK7 glass and has an uncoated wavelength range of 350 nm - 2.0 μm. Since N-SF11 glass has a lower Abbe Number than N-BK7 glass (25.76 compared to 64.17), it is associated with more dispersion.

Like all plano-concave lenses, these lenses have negative focal lengths and can be used to diverge collimated beams. In this case, the curved surface of the lens should face the source to minimize spherical aberration. In addition, they can be employed to offset the effects of spherical aberration caused by other lenses in an optical system.

Plano-Concave Lens Selection Guide
N-BK7	Uncoated -A (350 - 700 nm) -B (650 - 1050 nm) -C (1050 - 1620 nm)
N-SF11	Uncoated -A (350 - 700 nm) -B (650 - 1050 nm) -C (1050 - 1620 nm)
UV Fused Silica	Uncoated -UV (290 - 370 nm) -A (350 - 700 nm) -B (650 - 1050 nm) -C (1050 - 1620 nm)
CaF₂	Uncoated -E (3 - 5 µm)
ZnSe	-F (8 - 12 µm)

Custom Coatings are also available. Please contact our technical support staff for a quote.

Quick Links to Other Spherical Singlets
Plano-Convex	Bi-Convex	Best Form	Plano-Concave	Bi-Concave	Positive Meniscus	Negative Meniscus

Below is the measured transmission for a 10 mm thick uncoated sample of N-SF11 using normal incident light. Each lens can be purchased uncoated or with our -A (350-700 nm), -B (650-1050 nm), or -C (1050-1620 nm) antireflection coating.

Click Here for Raw Data
Click to Enlarge

The table below lists the options for fixed lens mounts for our N-SF11 Plano-Concave Lenses. Please note that some lenses require the use of the specified adapter.

Item #	Fixed Lens Mount
LC2969	LMRA6 and LMR05
LC2632	LMRA6 and LMR05
LC2067	LMRA9 and LMR05
LC2873	LMRA9 and LMR05
LC2265	LMR05
LC2679	LMR1 and SM1L05

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Posted Comments:

Poster: jjurado

Posted Date: 2011-08-05 12:01:00.0

Response from Javier at Thorlabs to jinwang: The internal transmission of N-SF11 glass at 407 nm is ~85% (10 mm thick sample) and ~67% for a 25 mm thick sample. Considering a nominal reflectance of 0.3% per surface for our AR A coating, we can estimate a total transmission of ~84.4% for the LCC2265-A (0.6% T loss). In reality, transmission may in fact be slightly higher, since the thickness of this lens along the optical axis is 3 mm.

Poster: ? jinwang

Posted Date: 2011-08-04 23:32:09.0

The graph of the internal transmission of the N-SF11 doesnt clearly show how well it internally transmits 407nm light, what is the total % loss in a LC2265-A lens?

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N-SF11 Plano-Concave Lenses, Uncoated

Features