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25mm Dia x 15mm FL 3-5μm Coated, Hybrid Ge Aspheric Lens

Name: 25mm Dia x 15mm FL 3-5μm Coated, Hybrid Ge Aspheric Lens
Brand: TECHSPEC
SKU: 68-260
Price: 1610.00 EUR

Stock #68-260 11 In Stock

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€1.610,00

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Qty 1+	€1.610,00 each
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Specifications
Product Details
Technical Information
Special Handling
Accessories
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Frequently Purchased Together
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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):

2.5

Clear Aperture CA (mm):

24.0

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):

14.01

Germanium (Ge)

f/#:

0.6

Numerical Aperture NA:

0.83

Index of Refraction (n_d):

4.002 @ 11µm

Coating:

BBAR (3000-5000nm)

Coating Specification:

R_avg <3.0% @ 3 - 5μm

Wavelength Range (nm):

3000 - 5000

Focal Length Specification Wavelength (nm):

4000

Aspheric Design Wavelength (nm):

4000

Surface Quality:

60-40

Asphere Figure Error, RMS @ 632.8nm:

λ/6

Surface Accuracy, P-V (μm):

0.3

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 235:

Compliant

Product Details

Color Corrected for 3 – 5μm
Near Diffraction Limited Focusing Performance
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.

Our TECHSPEC® Germanium Infrared (IR) Hybrid Aspheric Lenses provide diffraction limited focusing performance at any wavelength in the 3 – 5μm region, and near diffraction limited performance when used over the entire 3 -5μm spectral range. They are ideal for integration into imaging applications, FTIR spectrometers, or any Mid-Wave IR application utilizing a broad band light source.

Each hybrid aspheric lens is coated for >95% transmission for the most efficient use of costly infrared illumination. However, transmission is limited by the inherent diffraction efficiency of the aspheric surface, yielding lower overall transmission at the extremes of the design spectral band. For custom design or coating options, please contact our Sales Department.

Technical Information

Chart showing diffraction efficiency percentage varying with wavelength from 3000 to 5000 nm

Chart comparing RMS spot size of Germanium PCX spherical, asphere, hybrid asphere, and diffraction limited lenses across

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.