Compare Model Drawings, CAD & Specs Availability Price
Negative Achromatic Doublet Lens, Visible, 6.35 mm, -12.5 mm EFL, 400-700 nm
$92
In Stock
In Stock
Negative Achromatic Doublet Lens, Visible, 6.35 mm, -25 mm EFL, 400-700 nm
$92
In Stock
In Stock
Negative Achromatic Doublet Lens, Visible, 12.5 mm, -15 mm EFL, 400-700 nm
$101
In Stock
In Stock
Negative Achromatic Doublet Lens, Visible, 12.5 mm, -20 mm EFL, 400-700 nm
$101
In Stock
In Stock
Negative Achromatic Doublet Lens, Visible, 12.5 mm, -35 mm EFL, 400-700 nm
$101
In Stock
In Stock
Negative Achromatic Doublet Lens, Visible, 12.5 mm, -50 mm EFL, 400-700 nm
$101
In Stock
In Stock
Negative Achromatic Doublet Lens, Visible, 25 mm, -30 mm EFL, 400-700 nm
$129
In Stock
In Stock
Negative Achromatic Doublet Lens, Visible, 25 mm, -40 mm EFL, 400-700 nm
$129
In Stock
In Stock
Negative Achromatic Doublet Lens, Visible, 25 mm, -50 mm EFL, 400-700 nm
$129
In Stock
In Stock
Negative Achromatic Doublet Lens, Visible, 25 mm, -100 mm EFL, 400-700 nm
$129
In Stock
In Stock
Negative Achromatic Doublet Lens, Visible, 25 mm, -150 mm EFL, 400-700 nm
$129
In Stock
In Stock

Specifications

  • Lens Type
    Cemented Negative Achromatic Doublet
  • Lens Shape
    Bi-Concave
  • Antireflection Coating
    400-700 nm
  • Coating Type
    Visible Single-Layer MgF2
  • Damage Threshold
    1.0 J/cm2 @ 1064 nm, 10 ns , 10 Hz
  • Transmission
    Tavg>98%
  • Surface Quality
    40-20 scratch-dig
  • Surface Accuracy, Irregularity
    λ/4
  • Surface Accuracy, Power
    1.5 λ
  • Orientation
    Steepest concave surface should face the infinite conjugate
  • Design Wavelengths
    587.6 nm
  • Centration
    ≤1 arc min
  • Diameter Tolerance
    +0/-0.025 mm
  • Focal Length Tolerance
    ±2.0%

Features

Achromatic Lenses

An Achromat, or Achromatic lens, is usually made up of multiple optical elements, which can be air-spaced or cemented together. These typically alternate a positive lens of low index material, such as crown glass, and a negative lens of high index material, such as flint glass. The elements are selected and optimized so that dispersion in the positive element is corrected by the negative element, resulting in minimized chromatic aberration at two well-separated wavelengths. Achromats offer a nearly constant focal length across the visible spectrum, providing superior off-axis performance. Doublet lenses offer users many more design options than singlet lenses, which allows for superior performance in visual imaging and laser beam manipulation applications. Our lenses are computer designed, minimizing aberrations and providing a smaller focused spot size. They are offered with multi-layer or single-layer AR coatings. Standard diameters and focal lengths may be interchanged with our singlet lenses. Further, achromats are available in a wide variety of configurations, including positive, negative, triplet, and aspherized. These lenses are produced as doublets or triplets (three elements). The collimated beam should enter or depart from the surface (R1 in drawing) with higher curvature (smaller radius) for optimized performance.

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.

Superior Performance in Monochromatic Applications

Achromats are superior to singlet lenses for monochromatic applications at any visible wavelength. Negative achromatic lenses are used primarily to extend focal lengths, which is often combined with positive achromatic mirror systems and imaging lenses. Generally a diffraction limited spot may be achieved when using a monochromatic source such as laser.

IR Performance

Visible achromats are still usable in the IR, although they are not optimized. An achromat will not be diffraction limited at 1064 nm but performance will still be superior to a singlet lens. At 1064 nm, the focal length of a typical achromat increases by approximately 0.75%. Choosing these optics for image relay or optical processing applications will be more desirable than single element lenses.

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.