Compare Model Drawings, CAD & Specs Diameter Effective Focal Length (EFL) F/# Surface Quality Availability Price
$40
In Stock
6.35 mm 6.4 mm 1 40-20 scratch-dig
In Stock
$40
In Stock
6.35 mm 12.7 mm 2 40-20 scratch-dig
In Stock
$40
In Stock
6.35 mm 19.0 mm 2.9 40-20 scratch-dig
In Stock
$40
In Stock
6.35 mm 25.4 mm 4 40-20 scratch-dig
In Stock
$40
In Stock
6.35 mm 38.1 mm 6 40-20 scratch-dig
In Stock
$40
6.35 mm 50.2 mm 7.9 40-20 scratch-dig
$40
In Stock
6.35 mm 75.6 mm 11.9 40-20 scratch-dig
In Stock
$40
In Stock
6.35 mm 88.3 mm 13.9 40-20 scratch-dig
In Stock
$40
In Stock
6.35 mm 100 mm 15.7 40-20 scratch-dig
In Stock
$40
In Stock
8.0 mm 10.0 mm 1.3 40-20 scratch-dig
In Stock
$41
12.7 mm 19.0 mm 1.5 40-20 scratch-dig
$41
In Stock
12.7 mm 25.4 mm 2 40-20 scratch-dig
In Stock
$41
In Stock
12.7 mm 38.1 mm 3 40-20 scratch-dig
In Stock
$41
In Stock
12.7 mm 50.2 mm 3.9 40-20 scratch-dig
In Stock
$41
In Stock
12.7 mm 62.9 mm 4.9 40-20 scratch-dig
In Stock
$41
In Stock
12.7 mm 75.6 mm 5.9 40-20 scratch-dig
In Stock
$41
In Stock
12.7 mm 88.3 mm 6.9 40-20 scratch-dig
In Stock
$41
In Stock
12.7 mm 100 mm 7.8 40-20 scratch-dig
In Stock
$41
In Stock
12.7 mm 150 mm 11.8 40-20 scratch-dig
In Stock
$41
In Stock
12.7 mm 250 mm 19.6 40-20 scratch-dig
In Stock
$46
In Stock
25.4 mm 25.4 mm 1 40-20 scratch-dig
In Stock
$46
In Stock
25.4 mm 38.1 mm 1.5 40-20 scratch-dig
In Stock
$46
In Stock
25.4 mm 50.2 mm 1.9 40-20 scratch-dig
In Stock
$46
In Stock
25.4 mm 62.9 mm 2.4 40-20 scratch-dig
In Stock
$46
In Stock
25.4 mm 75.6 mm 2.9 40-20 scratch-dig
In Stock
$47
In Stock
25.4 mm 88.3 mm 3.4 40-20 scratch-dig
In Stock
$46
In Stock
25.4 mm 100 mm 3.9 40-20 scratch-dig
In Stock
$46
In Stock
25.4 mm 113 mm 4.4 40-20 scratch-dig
In Stock
$46
In Stock
25.4 mm 125 mm 4.9 40-20 scratch-dig
In Stock
$46
In Stock
25.4 mm 138 mm 5.4 40-20 scratch-dig
In Stock
$46
In Stock
25.4 mm 150 mm 5.9 40-20 scratch-dig
In Stock
$46
In Stock
25.4 mm 175 mm 6.8 40-20 scratch-dig
In Stock
$46
In Stock
25.4 mm 200 mm 7.8 40-20 scratch-dig
In Stock
$46
In Stock
25.4 mm 225 mm 8.8 40-20 scratch-dig
In Stock
$46
In Stock
25.4 mm 250 mm 9.8 40-20 scratch-dig
In Stock
$46
In Stock
25.4 mm 300 mm 11.8 40-20 scratch-dig
In Stock
$46
In Stock
25.4 mm 350 mm 13.8 40-20 scratch-dig
In Stock
$46
In Stock
25.4 mm 400 mm 15.7 40-20 scratch-dig
In Stock
$46
In Stock
25.4 mm 450 mm 17.7 40-20 scratch-dig
In Stock
$46
In Stock
25.4 mm 500 mm 19.6 40-20 scratch-dig
In Stock
$46
In Stock
25.4 mm 600 mm 23.6 40-20 scratch-dig
In Stock
$46
In Stock
25.4 mm 750 mm 29.5 40-20 scratch-dig
In Stock
$46
In Stock
25.4 mm 850 mm 33.5 40-20 scratch-dig
In Stock
$46
In Stock
25.4 mm 1000 mm 39.3 40-20 scratch-dig
In Stock
$79
In Stock
50.8 mm 62.9 mm 1.2 40-20 scratch-dig
In Stock
$79
In Stock
50.8 mm 75.6 mm 1.4 40-20 scratch-dig
In Stock
$80
In Stock
50.8 mm 88.3 mm 1.7 40-20 scratch-dig
In Stock
$79
In Stock
50.8 mm 100 mm 1.9 40-20 scratch-dig
In Stock
$80
In Stock
50.8 mm 125 mm 2.4 40-20 scratch-dig
In Stock
$79
In Stock
50.8 mm 150 mm 2.9 40-20 scratch-dig
In Stock
$83
In Stock
50.8 mm 175 mm 3.4 40-20 scratch-dig
In Stock
$83
In Stock
50.8 mm 200 mm 3.9 40-20 scratch-dig
In Stock
$80
50.8 mm 250 mm 4.9 40-20 scratch-dig
$80
In Stock
50.8 mm 300 mm 5.9 40-20 scratch-dig
In Stock
$79
In Stock
50.8 mm 400 mm 7.8 40-20 scratch-dig
In Stock
$79
In Stock
50.8 mm 500 mm 9.8 40-20 scratch-dig
In Stock
$83
In Stock
50.8 mm 750 mm 14.7 40-20 scratch-dig
In Stock
$80
In Stock
50.8 mm 1000 mm 19.6 40-20 scratch-dig
In Stock
$167
In Stock
76.2 mm 100 mm 1.3 40-20 scratch-dig
In Stock
$167
In Stock
76.2 mm 150 mm 1.9 40-20 scratch-dig
In Stock
$167
In Stock
76.2 mm 200 mm 2.6 40-20 scratch-dig
In Stock
$169
In Stock
76.2 mm 300 mm 3.9 40-20 scratch-dig
In Stock
In Stock
12.0 mm 20.0 mm 1.7 60-40 scratch-dig
In Stock
In Stock
12.0 mm 25.0 mm 2.1 60-40 scratch-dig
In Stock
In Stock
20.0 mm 50.0 mm 2.5 60-40 scratch-dig
In Stock
$24
In Stock
6.35 mm 6.4 mm 1 60-40 scratch-dig
In Stock
$24
In Stock
6.35 mm 12.7 mm 2 60-40 scratch-dig
In Stock
$24
In Stock
6.35 mm 25.4 mm 4 60-40 scratch-dig
In Stock
$24
In Stock
6.35 mm 38.1 mm 6 60-40 scratch-dig
In Stock
$25
In Stock
6.35 mm 50.2 mm 7.9 60-40 scratch-dig
In Stock
$26
In Stock
12.7 mm 19.0 mm 1.4 60-40 scratch-dig
In Stock
$26
In Stock
12.7 mm 25.4 mm 2 60-40 scratch-dig
In Stock
$27
In Stock
12.7 mm 38.1 mm 3 60-40 scratch-dig
In Stock
$27
In Stock
12.7 mm 50.2 mm 3.9 60-40 scratch-dig
In Stock
$26
In Stock
12.7 mm 62.9 mm 4.9 60-40 scratch-dig
In Stock
$27
In Stock
12.7 mm 75.6 mm 5.9 60-40 scratch-dig
In Stock
$27
In Stock
12.7 mm 100 mm 7.8 60-40 scratch-dig
In Stock
$29
In Stock
25.4 mm 25.4 mm 1 60-40 scratch-dig
In Stock
$28
In Stock
25.4 mm 38.1 mm 1.5 60-40 scratch-dig
In Stock
$28
In Stock
25.4 mm 50.2 mm 1.9 60-40 scratch-dig
In Stock
$28
In Stock
25.4 mm 62.9 mm 2.4 60-40 scratch-dig
In Stock
$29
In Stock
25.4 mm 75.6 mm 2.9 60-40 scratch-dig
In Stock
25.4 mm 88.3 mm 3.4 60-40 scratch-dig
$27
In Stock
25.4 mm 100 mm 3.9 60-40 scratch-dig
In Stock
$29
In Stock
25.4 mm 125 mm 4.9 60-40 scratch-dig
In Stock
$28
In Stock
25.4 mm 150 mm 5.9 60-40 scratch-dig
In Stock
$29
In Stock
25.4 mm 200 mm 7.8 60-40 scratch-dig
In Stock
In Stock
25.4 mm 400 mm 15.7 60-40 scratch-dig
In Stock
25.4 mm 450 mm 17.7 60-40 scratch-dig
$29
In Stock
25.4 mm 500 mm 19.6 60-40 scratch-dig
In Stock
In Stock
25.4 mm 750 mm 29.5 60-40 scratch-dig
In Stock
In Stock
25.4 mm 850 mm 33.5 60-40 scratch-dig
In Stock
$28
In Stock
25.4 mm 1000 mm 39.3 60-40 scratch-dig
In Stock

Specifications

  • Lens Shape
    Plano-Convex
  • Lens Material
    N-BK7
  • Antireflection Coating
    400-700 nm
  • Coating Type
    Visible Single-Layer MgF2
  • Coating Code
    -C
  • Damage Threshold
    7 J/cm², 10 ns pulses, 20 Hz at 532 nm
  • Surface Accuracy, Irregularity
    λ/4 (40-20 scratch-dig models)
    λ/2 (60-40 scratch-dig models)
  • Surface Accuracy, Power
    1.5λ (40-20 scratch-dig models)
    2.5λ (60-40 scratch-dig models)
  • Edge Thickness (Te)
    3.0 mm
  • Chamfers Angle/Tolerance
    45° ±15°, typical
  • Focal Length Tolerance
    ±1 % (40-20 scratch-dig models)
    ±2 % (60-40 scratch-dig models)
  • Diameter Tolerance
    +0/-0.1 mm (40-20 scratch-dig models)
    +0/-0.15 mm (60-40 scratch-dig models)
  • Center Thickness Tolerance
    ±0.1 mm (40-20 scratch-dig models)
    ±0.2 mm (60-40 scratch-dig models)
  • Clear Aperture
    ≥central 90% of diameter
  • Cleaning

Features

N-BK7 Substrates for VIS and NIR Applications

N-BK7 is an excellent lens material for most visible and near infrared applications. It is the most common borosilicate crown optical glass, and it 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-BK7 is also relatively hard and shows good scratch resistance. The transmission range for BK 7 is 380 to 2100 nm. It is not recommended for temperature sensitive applications, such as precision mirrors. For more information, refer to our optical materials technical note.

Uncoated Plano-Convex Lenses Offered in Precision and Economy Versions

Our uncoated precision plano-convex lenses are polished to tight tolerances using master test plates to ensure minimum wavefront distortion, for demanding laser electro-optic focusing applications. Tight surface quality tolerances minimize scatter and unwanted diffraction effects. Our standard precision lenses have a 40-20 scratch-dig surface quality, and a 1.5 λ surface power accuracy. We also offer economy versions of our lenses with a 60-40 scratch-dig surface quality, for excellent quality at a lower price point. For more information, refer to the optical surfaces technical note.

MgF2 Visible Antireflection Coating

Our single layer Magnesium Fluoride visible AR coating is the most common choice that offers extremely broad wavelength range at a reasonable price. It is standard on achromats and optional on our N-BK7 plano-convex spherical lenses and cylindrical lenses. Comparing to the uncoated surface, the MgF2 provides a significant improvement by reducing the reflectance to less than 1.5%. It works extremely well over a wide range of wavelengths (400 nm to 700 nm) at angles of incidence less than 15 degrees.

Standardized Plano-Convex Focal Lengths

Standard effective focal lengths across a variety of newport lens sizes, materials and shapes provide a systematic approach allowing for lenses of different sizes to be interchanged without requiring other changes to your optical system. Collimating a point light source coming from the planar surface or focusing a collimated light source which is incident on the curved surface will help to minimize the spherical aberration.

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 R-31005 HeNe laser focused to a spot using a KPX043 Plano-Convex Lens. This Hene laser has a beam diameter of 0.63 mm and a divergence of 1.3 mrad. Note that these are beam diameter and full divergence, so in the notation of our figure, y1 = 0.315 mm and θ1 = 0.65 mrad. The KPX043 lens has a focal length of 25.4 mm. Thus, at the focused spot, we have a radius θ1f = 16.5 µm. So, the diameter of the spot will be 33 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 KPX043 , 25.4 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 4 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.

Mounting Options

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 (Te) specification of the lens and the lens mount to ensure compatibility before purchasing. 

Lens Diameter LH-A-GRP
A-Line™ Lens Mounts
LT_Series_group_update
LT Series Lens Tubes
OM-multi_axis_lens_pos-S
LP Series Lens Positioners
optics-cage-plus-S
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

For non-standard sizes not listed above, check out our variable size lens mounts.