Uncoated N-SF11 Plano-Convex Lenses

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Overview

Our uncoated N-SF11 plano-convex lenses are designed to meet the demanding requirements of laser electro-optic focusing applications. These lenses are polished to high tolerances using master test plates to ensure low wavefront distortion. Tight surface quality tolerances minimize scatter and unwanted diffraction effects.

High performance 40-20 scratch-dig N-SF11 substrates
Plano-Convex shape for focusing applications
RoHS Certified

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Products

Compare	Model	Compatibility	rankScore	Diameter	Lens Material	Antireflection Coating	Surface Quality	Effective Focal Length (EFL)	Availability	Price	Brand
SFPX040 Plano-Convex Lens, N-SF11, 12.7 mm Diameter, 12.7 mm EFL, Uncoated $41 In Stock	SFPX040 Plano-Convex Lens, N-SF11, 12.7 mm Diameter, 12.7 mm EFL, Uncoated	UNIVERSAL	1.0	12.7 mm	N-SF11	Uncoated	40-20 scratch-dig	12.7 mm	In Stock	$41	Newport
SFPX076 Plano-Convex Lens, N-SF11, 25.4 mm Diameter, 25.4 mm EFL, Uncoated $42 In Stock	SFPX076 Plano-Convex Lens, N-SF11, 25.4 mm Diameter, 25.4 mm EFL, Uncoated	UNIVERSAL	1.0	25.4 mm	N-SF11	Uncoated	40-20 scratch-dig	25.4 mm	In Stock	$42	Newport
SFPX196 Plano-Convex Lens, N-SF11, 50.0 mm Diameter, 50.0 mm EFL, Uncoated $64 In Stock	SFPX196 Plano-Convex Lens, N-SF11, 50.0 mm Diameter, 50.0 mm EFL, Uncoated	UNIVERSAL	1.0	50.0 mm	N-SF11	Uncoated	40-20 scratch-dig	50.0 mm	In Stock	$64	Newport

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Specifications

Lens Shape

Plano-Convex
Lens Material

N-SF11
Antireflection Coating

Uncoated
Surface Quality

40-20 scratch-dig
Surface Accuracy, Irregularity

λ/4
F/#

1

Design Wavelength

587.6 nm
Centration

<1 arcminute
Focal Length Tolerance

±1 %
Diameter Tolerance

+0.0/-0.025 mm
Center Thickness Tolerance

±0.1 mm

Features

N-SF11 Substrates for VIS and NIR Applications

N-SF11 is an excellent lens material for most visible and near infrared applications (400 nm to 2.5 µm). N-SF11 is one of the most common flint optical glass used in harsh environments making them ideal for use in biology or chemical labs, and provides great performance at a good value. Its high homogeneity, low bubble and inclusion content, and straightforward manufacturability make it a good choice for transmissive optics. N-SF11 is also relatively hard and shows good scratch resistance. Our high index N-SF11 lenses are polished to 40-20 scratch-dig surface quality and λ/4 P-V irregularity. Compared to typical N-BK7 and UV fused silica lenses, their high index and lower F/# values allow for more light collection at a shorter focal distance.

Plano-Convex Lens Shape for Focusing Light

Plano-Convex lenses are the best choice for focusing parallel rays of light to a single point. They can be used to focus, collect and collimate light. The asymmetry of this lens shape minimizes spherical aberration in situations where the object and image are located at unequal distance from the lens. The optimum case is where the object is placed at infinity with parallel rays entering lens and the final image is a focused point.

Focusing a Collimated Laser Beam

For an application example, let’s look at the case of the output from a Newport N-LGP-173 HeNe laser focused to a spot using a SFPX040 Plano-Convex Lens. This Hene laser has a beam diameter of 0.79 mm and a divergence of 0.88 mrad. Note that these are beam diameter and full divergence, so in the notation of our figure, y₁ = 0.395 mm and θ₁ = 0.44 mrad. The SFPX040 lens has a focal length of 12.7 mm. Thus, at the focused spot, we have a radius θ₁f = 5.6 µm. So, the diameter of the spot will be 11.2 µm.

Collimating Light from a Point Source

Since a common application is the collimation of the output from an Optical Fiber, let’s use that for our numerical example. The Newport F-MBB fiber has a core diameter of 200 µm and a numerical aperture (NA) of 0.37. The radius y₁ of our source is then 100 µm. NA is defined in terms of the half-angle accepted by the fiber, so θ₁ = 0.37. If we again use the SFPX040 , 12.7 mm focal length lens to collimate the output, we will have a beam with a radius of 9.4 mm and a half-angle divergence of 7.9 mrad.

Mounted Version - with Lens Tubes

The lenses can be mounted in LT series lens tube for constructing a complex optical system or quickly connecting to other threaded lens mounts: A-Line™ series fixed lens mount, or adjustable lens positioner (with thread adapter). Use LT-WR series spanner wrench for easy lens installation.

We offer a full range of optical lens mounts to meet various experimental requirements. Below lists the recommended mounts for spherical lenses of standard sizes. Please see our Lens Mount Guide for additional information.

Note: besides the diameter, please check the Edge Thickness (T_e) specification of the lens and the lens mount to ensure compatibility before purchasing.

Lens Diameter	A-Line™ Lens Mounts	LT Series Lens Tubes	LP Series Lens Positioners	Optics Cage Plus Series
76.2 mm	(M-) LH-3A	N/A	N/A	N/A
50.8 mm	(M-) LH-2A LH-2N	LT20-05 LT20-10 LT20-20 LT20-30	LP-2A LP-2A-XY LP-2A-XYZ	N/A
38.1 mm	(M-) LH-1.5A	LT20 lens tube with LH-2R1.5 adapter	LP-2 lens positioner with LPLH-1.5T adapter	N/A
25.4 mm	(M-) LH-1A LH-1N LH-1XY LH-1TZ-A LH-1TZ	LT10-05 LT10-10 LT10-20 LT10-30	LP-1A LP-1A-XY LP-1A-XYZ	OC1-LH1-S OC1-LH1 OC1-LH1-TZ OC1-LH1-XY OC1-LH1-XYA OC1-LH1-XYC OC1-LH1-XYZ
12.7 mm	(M-) LH-0.5A LH-05N	LT05-05 LT05-10	LP-05A LP-05A-XY LP-05A-XYZ	N/A
6.35 mm	LH-05DB with LH-50R25 adapter	LT05 lens tube with LH-50R25 adapter	LP-05 lens positioner with LPLH-25T adapter	N/A