Visible MgF₂ Antireflection Coated Negative Achromatic Doublet Lenses

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Overview

Our visible MgF₂ coated achromatic doublet lenses feature minimized spherical aberration and coma at infinite conjugates, yielding minimal focus spot size. Unlike singlet lenses, achromatics have constant focal length independent of aperture and operating wavelength, and have superior off-axis performance.

Commonly used to expand light in order to increase focal length and magnification
400-700 nm Single-layer visible MgF₂ AR coating
Significantly better optical performance than singlet lenses
Nearly constant focal length across the visible spectrum
Far superior off-axis performance
Ideal for general purpose benchtop prototyping

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Products

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Compare	Model		Diameter	Lens Material	Effective Focal Length (EFL)	Availability	Price	Brand
NAC010 Negative Achromatic Doublet Lens, Visible, 6.35 mm, -12.5 mm EFL, 400-700 nm $111 In Stock	NAC010 Negative Achromatic Doublet Lens, Visible, 6.35 mm, -12.5 mm EFL, 400-700 nm	1.0	6.35 mm	N-BAF10/N-SF10	-12.5 mm	In Stock	$111	Newport
NAC016 Negative Achromatic Doublet Lens, Visible, 6.35 mm, -25 mm EFL, 400-700 nm $111 In Stock	NAC016 Negative Achromatic Doublet Lens, Visible, 6.35 mm, -25 mm EFL, 400-700 nm	2.0	6.35 mm	N-BAF10/N-SF10	-25 mm	In Stock	$111	Newport
NAC012 Negative Achromatic Doublet Lens, Visible, 12.5 mm, -15 mm EFL, 400-700 nm $121 In Stock	NAC012 Negative Achromatic Doublet Lens, Visible, 12.5 mm, -15 mm EFL, 400-700 nm	3.0	12.5 mm	N-BAF10/N-SF10	-15 mm	In Stock	$121	Newport
NAC013 Negative Achromatic Doublet Lens, Visible, 12.5 mm, -20 mm EFL, 400-700 nm $121 In Stock	NAC013 Negative Achromatic Doublet Lens, Visible, 12.5 mm, -20 mm EFL, 400-700 nm	4.0	12.5 mm	N-BAF10/N-SF10	-20 mm	In Stock	$121	Newport
NAC025 Negative Achromatic Doublet Lens, Visible, 12.5 mm, -35 mm EFL, 400-700 nm $121 In Stock	NAC025 Negative Achromatic Doublet Lens, Visible, 12.5 mm, -35 mm EFL, 400-700 nm	5.0	12.5 mm	N-BK7/N-SF5	-35 mm	In Stock	$121	Newport
NAC028 Negative Achromatic Doublet Lens, Visible, 12.5 mm, -50 mm EFL, 400-700 nm $121 In Stock	NAC028 Negative Achromatic Doublet Lens, Visible, 12.5 mm, -50 mm EFL, 400-700 nm	6.0	12.5 mm	N-BK7/N-SF5	-50 mm	In Stock	$121	Newport
NAC040 Negative Achromatic Doublet Lens, Visible, 25 mm, -30 mm EFL, 400-700 nm $155 In Stock	NAC040 Negative Achromatic Doublet Lens, Visible, 25 mm, -30 mm EFL, 400-700 nm	7.0	25 mm	N-BAF10/N-SF10	-30 mm	In Stock	$155	Newport
NAC044 Negative Achromatic Doublet Lens, Visible, 25 mm, -40 mm EFL, 400-700 nm $155 In Stock	NAC044 Negative Achromatic Doublet Lens, Visible, 25 mm, -40 mm EFL, 400-700 nm	8.0	25 mm	N-BAF10/N-SF10	-40 mm	In Stock	$155	Newport

Showing 1 to 08 of 11 entries

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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

T_avg>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.

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- Model: M-LH-3A Fixed Lens Mount, 3.0 in. (76.2 mm) Diameter, M4 Thread, A-LINE $69 In Stock See Full Product Details Product Series Overview A-Line Fixed Lens Mounts ) LH-3A Model: LH-3A Fixed Lens Mount, 3.0 in. (76.2 mm), 8-32 Thread, A-LINE $69 In Stock See Full Product Details Product Series Overview A-Line Fixed Lens Mounts	N/A	N/A	N/A
50.8 mm	(M- Model: M-LH-2A Fixed Lens Mount, Ø2.0 in. (50.8 mm), M4 Thread, A-LINE $36 In Stock See Full Product Details Product Series Overview A-Line Fixed Lens Mounts ) LH-2A Model: LH-2A Fixed Lens Mount, 2.0 in. (50.8 mm), 8-32 Thread, A-LINE $36 In Stock See Full Product Details Product Series Overview A-Line Fixed Lens Mounts LH-2N Model: LH-2N Lens Mount, Insertable, 50.8 mm Diameter, A-LINE $42 In Stock See Full Product Details Product Series Overview A-Line™ Insertable Fixed Lens Mounts	LT20-05 Model: LT20-05 Lens Tube, 2 inch LT Series, 1/2 inch length $36 In Stock See Full Product Details Product Series Overview Lens Tubes LT20-10 Model: LT20-10 Lens Tube, 2 inch LT Series, 1 inch length $39 In Stock See Full Product Details Product Series Overview Lens Tubes LT20-20 Model: LT20-20 Lens Tube, 2 inch LT Series, 2 inch length $42 In Stock See Full Product Details Product Series Overview Lens Tubes LT20-30 Model: LT20-30 Lens Tube, 2 inch dia. LT Series, 3 inch length $47 In Stock See Full Product Details Product Series Overview Lens Tubes	LP-2A Model: LP-2A Precision Lens Positioner, 2.0 in., 100 TPI XYθXθY, 80 TPI Z $1,088 In Stock See Full Product Details Product Series Overview Precision Multi-Axis Lens Positioners LP-2A-XY Model: LP-2A-XY Precision Lens Positioner, 2.0 in. Diameter, 100 TPI XY $702 In Stock See Full Product Details Product Series Overview Precision Multi-Axis Lens Positioners LP-2A-XYZ Model: LP-2A-XYZ Precision Lens Positioner, 2.0 in., 100 TPI XY, 80 TPI Z $785 In Stock See Full Product Details Product Series Overview Precision Multi-Axis Lens Positioners	N/A
38.1 mm	(M- Model: M-LH-1.5A Fixed Lens Mount, 1.5 in. (38.1 mm) Diameter, M4 Thread, A-LINE $34 In Stock See Full Product Details Product Series Overview A-Line Fixed Lens Mounts ) LH-1.5A Model: LH-1.5A Fixed Lens Mount, 1.5 in. (38.1 mm) Diameter, 8-32 Thread, A-LINE $34 In Stock See Full Product Details Product Series Overview A-Line Fixed Lens Mounts	LT20 lens tube with LH-2R1.5 Model: LH-2R1.5 Lens Adaptor, 2.0 in. Mount to 1.5 in. Diameter Lens, A-LINE $31 In Stock See Full Product Details Product Series Overview A-Line Fixed Lens Mounts adapter	LP-2 lens positioner with LPLH-1.5T Model: LPLH-1.5T Optic Holder, 1.5 in. Diameter, 2.063-20 Thread, For LP-2A Series $97 In Stock See Full Product Details Product Series Overview Precision Multi-Axis Lens Positioners adapter	N/A
25.4 mm	(M- Model: M-LH-1A Fixed Lens Mount, Ø1.0 in. (25.4 mm), M4 Thread, A-LINE $20 In Stock See Full Product Details Product Series Overview A-Line Fixed Lens Mounts ) LH-1A Model: LH-1A Fixed Lens Mount, 1.0 in. (25.4 mm) Diameter, 8-32 Thread, A-LINE $20 In Stock See Full Product Details Product Series Overview A-Line Fixed Lens Mounts LH-1N Model: LH-1N Lens Mount, Insertable, 25.4 mm Diameter, A-LINE $29 In Stock See Full Product Details Product Series Overview A-Line™ Insertable Fixed Lens Mounts LH-1XY Model: LH-1XY XY Lens Mount, Insertable, 25.4 mm, A-LINE $185 In Stock See Full Product Details Product Series Overview A-Line Adjustable Optic Mounts LH-1TZ-A Model: LH-1TZ-A Fine Focusing Lens Mount, 1.0 in., Screw Drive, 8-32 and M4, A-LINE $230 In Stock See Full Product Details Product Series Overview A-Line Adjustable Optic Mounts LH-1TZ Model: LH-1TZ Fine Focusing Lens Mount, 1.0 in., Micrometer Drive, 8-32 and M4, A-LINE $258 In Stock See Full Product Details Product Series Overview A-Line Adjustable Optic Mounts	LT10-05 Model: LT10-05 Lens Tube, 1 inch LT Series, 1/2 inch length $20 In Stock See Full Product Details Product Series Overview Lens Tubes LT10-10 Model: LT10-10 Lens Tube, 1 inch LT Series, 1 inch length $23 In Stock See Full Product Details Product Series Overview Lens Tubes LT10-20 Model: LT10-20 Lens Tube, 1 inch LT Series, 2 inch length $24 In Stock See Full Product Details Product Series Overview Lens Tubes LT10-30 Model: LT10-30 Lens Tube, 1 inch LT Series, 3 inch length $36 In Stock See Full Product Details Product Series Overview Lens Tubes	LP-1A Model: LP-05A Precision Lens Positioner, 0.5 in., 100 TPI XYθXθY, 80 TPI Z $749 3 Weeks See Full Product Details Product Series Overview Precision Multi-Axis Lens Positioners 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