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Achromatic Lenses
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Achromatic lenses effectively reduce or eliminate chromatic aberration, with their optimized layout also helping minimize spherical aberration. They are usually cemented from a low-index element and a high-index element. Compared with standard singlet lenses, these components produce finer focused spots. Benefiting from excellent aberration correction capability, achromatic lenses are widely adopted for fluorescence microscopy, optical image relay, industrial inspection and spectroscopy.
Parameters
Specification
Material
Optical Flint glass & Crown glass
Diameter Range
3 ~ 200mm
Diameter Tolerance +0.00/-0.02mm Surface Irregularity λ/10@632.8nm Surface Quality 10-5 Focal Length Tolerance ±0.5% Centration 30 arc sec. Clear Aperture > 90% of diameter Bevel 0.2mm × 45° Coating As customer's request JT Processing Capability
JT supplies custom positive and negative achromatic lenses tailored to unique client specifications, with customizable anti-reflection coatings covering VIS, NIR and SWIR spectral ranges. Backed by 19 years of manufacturing experience, our professional engineering team specializes in high-precision custom lens fabrication. Beyond finished lens production, we deliver one-stop technical support including optical design development, element structure optimization, production feasibility evaluation and finished-product performance testing.
How Are Achromatic Lenses Constructed and Classified?
The chromatic lens is generally constructed by cementing two separate optical parts: a positive crown glass with low refractive index paired with a negative flint glass featuring high refractive index. Unlike singlet lenses made from a single glass blank, the doublet layout grants extra design flexibility to fine-tune overall optical performance. As a result, achromatic lenses deliver superior optical characteristics when matched against single-element lenses of identical focal length and outer dimension.
Achromats are manufactured in multiple mainstream styles including positive, negative, triplet and aspherized versions. It’s worth clarifying that achromatic optics can adopt either two-piece doublet or three-piece triplet construction; the total count of lens components bears no connection to its aberration correction capacity. For instance, an achromatic unit engineered for visible-spectrum use is calibrated to focus red and blue light at one focal plane regardless of whether it follows doublet or triplet structural design.
Why Are Achromatic Lenses Important?
- Superior imaging performance: These lenses eliminate unwanted colored edge fringing, greatly boosting definition and luminous efficiency especially for polychromatic light imaging scenarios.
- Optimized light throughput: Their on-axis optical performance stays stable with enlarged aperture dimensions, enabling full utilization of the lens’s usable clear aperture, an obvious advantage over basic singlet lenses.
- Economical optical solution: While high-end advanced alternatives for aberration correction are available, achromats balance correction capability and manufacturing expense perfectly. For most regular optical projects, they deliver sufficient aberration control at a reasonable cost for high-quality white-light imaging.
- Superior imaging performance: These lenses eliminate unwanted colored edge fringing, greatly boosting definition and luminous efficiency especially for polychromatic light imaging scenarios.
Achromatic Lenses
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