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See all 43 Products in Family

TECHSPEC^® components are designed, specified, or manufactured by Edmund Optics. Learn More

25mm Dia x 20mm FL 8-12μm Coated, Ge Aspheric Lens

Name: 25mm Dia x 20mm FL 8-12μm Coated, Ge Aspheric Lens
Brand: TECHSPEC
SKU: 68-253
Price: €1.534,70

Stock #68-253 Clearance 3-4 days Other Coating Options

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€1.534^,70

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€1.534,70

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Product Downloads

STEP:step

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Code V:seq

EO Spec Sheet

Specifications
Product Details
Technical Information
Special Handling
Accessories
Related Products
Imaging Lens Selector
Frequently Purchased Together
Compatible Mounts
Resources

Specifications

General

Type:

Aspheric Lens

Physical & Mechanical Properties

Diameter (mm):

25.00 +0.0/-0.1

Centering (arcmin):

≤5

Clear Aperture CA (mm):

22.5

Edge Thickness ET (mm):

2.5

Center Thickness CT (mm):

3.70 ±0.10

Bevel:

Protective as needed

Edges:

Diamond Turned

Shape of Back Surface:

Plano

Optical Properties

Effective Focal Length EFL (mm):

20.00 @ 4000nm

Numerical Aperture NA:

0.63

Back Focal Length BFL (mm):

19.08

Germanium (Ge)

Aspheric Design Wavelength (nm):

4000

Asphere Figure Error, RMS @ 632.8nm:

λ/6

Coating:

BBAR (8000-12000nm)

Coating Specification:

R_avg <3.0% @ 8 - 12μm

Surface Quality:

60-40

f/#:

0.79

Wavelength Range (nm):

8000 - 12000

Conjugate Distance:

Infinite

Regulatory Compliance

RoHS 2015:

Compliant

Certificate of Conformance:

View

Reach 235:

Compliant

Product Details

Diffraction Limited Performance
Variety of Coating Options
Full Prescription Data Available
Due to material supply chain disruptions with germanium, there may be increased lead times and price changes on our germanium products. For more information, please contact our customer service team.
Edmund Optics has limited remaining inventory of this part number and no raw material available to supply more once this is depleted. Please contact our Product Support Engineers to help with an alternate solution for your needs. Customer Service can provide you the latest price and availability.

TECHSPEC® Germanium Infrared (IR) Aspheric Lenses provide diffraction-limited focusing performance over a broad spectral range in the Mid and Long Wave infrared regions. Ideal for monochromatic light sources, such as quantum cascade lasers, these lenses offer a high-performance alternative to standard plano-convex lenses.
The lenses are available in a 12.5, 25, or 50mm diameter. TECHSPEC® Germanium Infrared (IR) Aspheric Lenses are available uncoated, or with BBAR coating options.

Uncoated germanium has transmission of <50%, so custom anti-reflection (AR) coatings should be considered if specifying an uncoated lens. Each BBAR coated lens offers >95% transmission, making it ideal for integration into a variety of OEM applications. For custom design or coating options, please contact our Sales Department.

Technical Information

AR COATED GERMANIUM
	Typical transmission of a 3mm thick Ge window with BBAR (3000-5000nm) coating at 0° AOI. The blue shaded region indicates the coating design wavelengh range, with the following specification: R_avg <3% @ 3000 - 5000nm Data outside this range is not guaranteed and is for reference only. Click Here to Download Data
	Typical transmission of a 3mm thick Ge window with BBAR (3000-12000nm) coating at 0° AOI. The blue shaded region indicates the coating design wavelengh range, with the following specification: R_avg <5.0% @ 3 - 12μm Data outside this range is not guaranteed and is for reference only. Click Here to Download Data
	Typical transmission of a 3mm thick Ge window with BBAR (8000-12000nm) coating at 0° AOI. The blue shaded region indicates the coating design wavelengh range, with the following specification: R_avg <3.0% @ 8 - 12μm Data outside this range is not guaranteed and is for reference only. Click Here to Download Data

Special Handling

Germanium Optics Handling and Cleaning Guidelines

Germanium optics require special handling and cleaning procedures. Always wear gloves during handling to prevent contamination, and wash hands afterward. Avoid contact between Germanium dust and the eyes, skin, or clothing. When not in use, store optics sealed and covered at temperatures between 20°C and 25°C. Do not expose them to temperatures exceeding 100°C when in use.

Handling Guidelines

Always wear gloves to prevent damage from skin oils.
If Germanium dust is present, take the following precautions:
- Wear safety glasses to protect eyes.
- Use a dust mask or face mask to avoid inhalation.
- Wear gloves to prevent skin contact.
Maintain storage temperature between 20°C and 25°C with humidity below 30%.
Wrap Germanium optics in a lens cloth or pouch and seal in a container when not in use.
Germanium is brittle and heavy — always place it on soft surfaces and avoid dropping it.

Approved Cleaning Solvents

Ethanol
Isopropyl Alcohol
Methanol
Reagent-Grade Acetone
Liquid CO₂
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Accessories

Related Products

Optical Lens and Filter Mounts

Germanium Infrared (IR) Hybrid Aspheric Lenses

Germanium (Ge) Plano-Convex (PCX) Lenses

Germanium Meniscus Lenses

Imaging Lens Selector

Frequently Purchased Together

#68-257 - 25mm Dia x 50mm FL 8-12μm Coated, Ge Aspheric Lens

€1.467,75

#68-258 - 25mm Dia x 75mm FL 8-12μm Coated, Ge Aspheric Lens

€1.467,75

#64-488 - Fly's Eye Array 5 x 5mm, 250μm Pitch, 5° Divergence

€262,65

#68-254 - 25mm Dia x 25mm FL 8-12μm Coated, Ge Aspheric Lens

€1.467,75

Compatible Mounts

Title	Type	Stock Number	Price	Buy
25.0/25.4mm Optic Dia., SM1 Thin Mount, M4	Fixed	#13-787	€20,09 Request Quote	In Stock ×
25.0/25.4mm Optic Dia., SM1 Thin Mount, 8-32	Fixed	#13-788	€20,09 Request Quote	3-4 days ×
25.0mm Optic Dia., Optic Mount	Fixed	#64-560	€31,42 Request Quote	In Stock ×
25mm Thin Inner Single Optic Mount	Fixed	#38-755	€35,02 Request Quote	3-4 days ×
25.0/25.4mm Optic Dia., L-Slot Direct Mount	Fixed	#36-410	€66,50 Request Quote	3-4 days ×
25/25.4mm Diameter, T-Mount Thin Optic Mount	Fixed	#52-292	€67,47 Request Quote	3-4 days ×
25.0/25.4mm Optic Dia., Side Flange Direct Mount	Fixed	#36-414	€68,50 Request Quote	3-4 days ×
25mm Thin Inner Pair Optic Mounts	Fixed	#11-052	€68,50 Request Quote	3-4 days ×
25mm Thick Inner Pair Optic Mounts	Fixed	#11-054	€68,50 Request Quote	3-4 days ×
25.0/25.4mm Optic Dia., L-Slot and Rotation Direct Mount	Adjustable - Rotary	#36-411	€97,85 Request Quote	Contact Us ×
25/25.4mm Diameter, C-Mount Thin Optic Mount	Fixed	#56-353	€100,94 Request Quote	In Stock ×
25.0/25.4mm Optic Dia., X-Y Translating Optic Mount	Adjustable - Linear (XY)	#62-956	€265,74 Request Quote	In Stock ×
25.0/25.4mm Optic Dia., X-Y-Z Translating Optic Mount	Adjustable - Linear (XYZ)	#62-959	€520,15 Request Quote	3-4 days ×
25.0/25.4mm Optic Dia., 5 Axes Optical Mount	Adjustable - Linear (XYZ) & Tip-Tilt	#13-776	€726,15 Request Quote	3-4 days ×

Check out our full selection of mounts here.

Resources

Filter

Anti-Reflection (AR) Coatings

Anti-reflection (AR) coatings are applied to optical components to increase throughput and reduce hazards caused by back-reflections.

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An Introduction to Optical Coatings

Optical coatings are used to influence the transmission, reflection, or polarization properties of an optical component.

View Now

Lens Geometry Performance Comparison

This comparison of the performance of aspheric, achromatic, and spherical PCX lenses in different situations reveals the ideal use cases for each type of lens.

View Now

All About Aspheric Lenses

Learn all about the benefits of aspheres, their unique anatomy, how they're manufactured, and how to choose the right one for your system.

View Now

Advantages of using engineered chalcogenide glass for color corrected, passively athermalized LWIR imaging systems

View Now

Infrared Light

Optical Engineer Andrew Fisher explains how you can see the "invisible" light, or infrared light, from your own TV remote.

View Now

Short Wave Infrared (SWIR)

View Now

Advantages of Using Meniscus Lenses in Infrared Applications

Meniscus lenses offer superior performance compared to plano convex lenses in IR applications. Find out the benefits of using a meniscus lens at Edmund Optics.

View Now

The Correct Material for Infrared (IR) Applications

Using an Infrared Application? Discover the importance of choosing the right material and comparisons of each at Edmund Optics.

View Now

Is it okay to clean an infrared lens, for example one made of germanium, with ethanol?

View Now

Infrared (IR) Spectrum

View Now

Mid-spatial frequency errors of mass-produced aspheres

View Now

Computer Generated Hologram Metrology

Computer Generated Hologram metrology provides a new solution for overcoming traditional asphere metrology. Learn more about CGH metrology at Edmund Optics.

View Now

Aspheric Lens Takeover

Time to Replace Spherical Elements with Aspheric Lenses

View Now

UV vs. IR Grade Fused Silica

UV grade fused silica is ideal for UV and visible applications, but IR grade fused silica has better transmission in the IR due to a lack of OH- impurities.

View Now

What is SWIR?

Have a question about short-wave infrared (SWIR)? Find definitions, application uses, and examples at Edmund Optics.

View Now

Hyperspectral and Multispectral Imaging

Are you trying to gauge depth of field in your imaging system? Take a closer look at this article on depth of field calculations at Edmund Optics.

View Now

Hyperspectral & Multispectral Imaging – TRENDING IN OPTICS: EPISODE 7

Hyperspectral and multispectral imaging are imaging technologies that capture information from a broader portion of the electromagnetic spectrum.

View Now

You offer many substrates for UV and IR applications. How do I know which is best for me?

View Now

Shape Factor Influence in Aspheric Lens Design

Learn how the shape factor of an aspheric lens effects its performance and when certain shape factors are the most advantageous.

View Now

ISO Drawings for Aspheric Lenses

Aspheric lens drawings following the ISO 10110 standard are critical tools for communicating manufacturing and testing requirements for the lenses.

View Now

Aspheric Lens Irregularity and Strehl Ratio

The Strehl ratio of an optical system is a comparison of its real performance with its diffraction-limited performance.

View Now

Aspheric Lenses Review

What is an aspheric lens? In what applications are aspheric lenses used?

View Now

How an Aspheric Lens is Made

Edmund Optics® manufactures thousands of precision aspheric lenses per month in our asphere manufacturing cell that operates 24 hours a day.

View Now

Aspheres: Still Adding Value

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The Long and the Short of It: Techniques for Measuring Aspheres

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Designing Large Diameter Aspheres

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Managing Holography Errors in Asphere Metrology

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Properly Designing and Specifying Aspheric Lenses

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Spatial Frequencies and Aspheric Lens Performance

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Understanding Aspheric Lenses

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Aspheres: The impact of shape factor on asphere design

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Does Edmund Optics® sell Computer Generated Holograms?

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Is there a limit to the range of angles in which a CGH can be used?

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Should the aspheric surface of an asphere always face the object / light source?

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How do I know if angle of incidence (AOI) and deposition effects during coating will be an issue for me when looking at off-the-shelf aspheres?

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Are all aspheric lenses from Edmund Optics® polished using magnetorheological finishing (MRF)?

No, advances in subaperture polishing have allowed for the fabrication of aspheres with surface figure error down to λ/20 (0.25µm). However, MRF is still...

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What are the challenges associated with increasing the diameter of optics like aspheric lenses?

The CNC polishing equipment used to fabricate the optics must have a large enough range of motion to properly polish the full asphere, and the weight of the...

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What are aspheric condenser lenses?

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Why plastic aspheric lenses?

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What exact kind of metrology does Edmund Optics use to support its asphere manufacturing?

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Does Edmund Optics still use magnetorheological finishing for high quality aspheres?

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What are the different types of aspheric lenses?

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Aspheric Lens

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CNC Polished Aspheric Lenses

CNC polished aspheric lenses offer high numerical apertures while creating diffraction-limited spot sizes and are ideal for high-precision applications.

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Mid-Spatial Frequency (MSF) Errors

Deviations in surface form relative to an ideal shape at higher spatial frequencies than Zernike polynomial aberrations but lower frequencies than roughness.

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Plastic Molded Aspheric Lenses

Lightweight, cost-effective aspheric lenses with a lower scratch resistance and thermal stability than molded glass aspheres.

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Precision Glass Molded Aspheric Lenses

Meta description: Ideal for volume applications, including laser diode collimation, bar code scanners, and optical data storage. Can be molded into diameters as small as 1mm.

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Spherical Aberration

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Cinema Lenses, The Age of Streaming, and Aspheres

Cinema lenses designed to create content tailored for online streaming utilize aspheres to shoot with a shallow depth of field while maintaining quality.

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Aspherized Achromatic Lens Review

Aspherized Achromatic Lenses, exclusive to Edmund Optics, are doublet lenses consisting of two cemented optical elements that are matched for their color-correction ability and small RMS spot size.

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Modifying Stock Optics Tip #3: Turn A Sphere Into An Asphere

Join Andrew Fisher, Manufacturing R&D Engineer at Edmund Optics, as he discusses some tips for modifying stock optical components to fit your application's needs.

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What are the benefits of aspheric lenses compared to standard singlet lenses?

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Is CGH metrology used for measuring any other products besides aspheric lenses?

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What are the accuracy limitations of a CGH?

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Hybrid Molding

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Aspherized Achromatic Lenses

Want an inside look at Aspherized Achromatic Lenses? Learn about the advantages, composition, and aspherized process at Edmund Optics.

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The Airy Disk and Diffraction Limit

The diffraction pattern caused when light passes through an aperture is called the Airy Disk. Find out how the Airy Disk can impact your image at Edmund Optics.

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What is the difference between an inked lens and a non-inked one?

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If I want to design with your lenses and lens assemblies, how do I get the information that I need?

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Now that I have chosen my lens, how do I mount it?

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Chromatic Focal Shift

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Conjugate Distance

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Épaisseur de bord

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Distance focale effective (EFL)

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Finite/Finite Conjugate

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Power

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Singlet Lens

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Strehl Ratio

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How to Determine Magnification of an Optical Lens Setup

When doing basic imaging, how do you determine the magnification an optical lens will provide?

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Understanding Collimation to Determine Optical Lens Focal Length

Collimated light occurs when light rays travel parallel to each other.

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How to Form an Image with an Optical Lens Setup

Although a common misconception, individual optical lenses do not always form an image when the object plane is placed a focal length away from the lens.

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Modifying Stock Optics Tip #4: Add A Coating To A Stock Lens

Join Andrew Fisher, Manufacturing R&D Engineer at Edmund Optics, as he discusses some tips for modifying stock optical components to fit your application's needs.

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Diffraction Limit

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Irregularity

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Radius of Curvature

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BBAR Coating

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Diopter

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Anti-Reflection (AR) Coating

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Bevel

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Seamed Edge

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Introduction to Basic Ray Optics

An understanding of refraction and basic ray optics is a critical foundation for understanding more complicated optical concepts and technologies.

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Meet Jeremy Govier: Asphere Guru

The Future Depends on Optics®

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Surface Flatness

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Transmission

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How do I clean my optics?

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Edmund Optics Global Manufacturing Facilities

Edmund Optics® (EO) manufactures millions of precision optical components and subassemblies every year in our 5 global manufacturing facilities.

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Metrology at Edmund Optics: Measuring as a Key Component of Manufacturing

Learn about the metrology that Edmund Optics® uses to guarantee the quality of all optical components and assemblies.

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Clear Aperture (CA)

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Refraction

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Surface Quality

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