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25mm Dia x 15mm FL Uncoated, Ge Aspheric Lens

Name: 25mm Dia x 15mm FL Uncoated, Ge Aspheric Lens
Brand: TECHSPEC
SKU: 68-236
Price: 1452.20 USD

Stock #68-236 Clearance 5 In Stock Other Coating Options

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$1,452.20

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Specifications
Product Details
Technical Information
Special Handling
Accessories
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Frequently Purchased Together
Compatible Mounts
Resources

Specifications

General

Type:

Aspheric Lens

Physical & Mechanical Properties

Diameter (mm):

25.00 +0.0/-0.1

Center Thickness CT (mm):

4.00 ±0.10

Edge Thickness ET (mm):

2.47

Clear Aperture CA (mm):

22.5

Centering (arcmin):

≤5

Shape of Back Surface:

Plano

Edges:

Diamond Turned

Bevel:

Protective as needed

Optical Properties

Effective Focal Length EFL (mm):

15.00 @ 4000nm

Back Focal Length BFL (mm):

14.00

Germanium (Ge)

f/#:

0.6

Numerical Aperture NA:

0.83

Index of Refraction (n_d):

4.002 @ 11µm

Coating:

Uncoated

Wavelength Range (nm):

2000 - 14000

Focal Length Specification Wavelength (nm):

4000

Aspheric Design Wavelength (nm):

4000

Surface Quality:

60-40

Asphere Figure Error, RMS @ 632.8nm:

λ/6

Conjugate Distance:

Infinite

Material Properties

Coefficient of Thermal Expansion CTE (10^-6/°C):

6.1

Regulatory Compliance

RoHS 2015:

Compliant

Certificate of Conformance:

View

Reach 240:

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

Chart comparing RMS spot size in microns of Germanium PCX and Asphere lenses across F/# values from 0.5 to 3

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

These optics require special handling to avoid damage and ensure long-term performance. Proper handling, cleaning, and storage are essential to maintain optical quality. Explore our Optics Cleaning Resources for step-by-step guides and best practices. For personalized assistance, Email us or Chat with our technical support team.