Achromatic Lenses Guides of Knowledge, Cost ... - Chineselens

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Achromatic Triplet Lenses represent an advanced optical technology specifically designed for the effective correction of chromatic aberrations and other types of optical anomalies. These lenses are composed of three distinct lens elements, typically two elements made of high refractive index materials encasing one made of a lower refractive index material. This arrangement not only significantly reduces aberrations, including distortion and spherical aberrations, but also provides clear, high-quality imaging results.

Structure and Working Principle

Achromatic Triplet Lenses usually feature a symmetrical three-element design, consisting of two high refractive index glasses (such as crown glass) and one low refractive index glass (like flint glass) bonded together through a precise adhesion process. This structural layout enables the lens to efficiently correct chromatic aberration and further reduce aberrations, such as pincushion distortion and spherical aberration, through its symmetry.

Application Areas

With their excellent imaging properties, Achromatic Triplet Lenses are extensively used in fields that demand high-quality imaging. These include fluorescence microscopy, spectroscopy, surface inspection, and life sciences imaging, among others. The lenses are capable of providing excellent color correction and high-resolution image quality across a wide wavelength range.

Advantages

1. Chromatic Aberration Correction: The Achromatic Triplet Lenses can precisely adjust light of different wavelengths to the same focal plane, significantly reducing the occurrence of chromatic aberrations.
2. Reduced Aberrations: Thanks to the ingenious symmetrical design and precise manufacturing processes, distortions such as pincushion distortion and spherical aberration are effectively controlled and minimized.
3. High-Resolution Imaging: These lenses offer high-definition and high-quality imaging solutions for a variety of precision optical applications.

 

Manufacturing Materials and Processes

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The production of Achromatic Triplet Lenses involves the precise bonding of lenses made from different types of materials. Typical lens materials include traditional optical glass, ultraviolet-grade fused silica (JGS1), infrared-grade fused silica (JGS3), and calcium fluoride (CaF2), among others. Key lens parameters, such as the radius of curvature, central and edge thickness, are meticulously designed to ensure optimal optical performance.

Typical Specifications

• Manufacturing Materials: Various, including optical glass, ultraviolet-grade fused silica, infrared-grade fused silica, and calcium fluoride.
• Dimensional Tolerances: Typically, ±0.03mm for standard factory specifications, with precision manufacturing achieving up to ±0.01mm.
• Center Thickness Tolerance: ±0.03mm as the standard factory specification, with manufacturing limits reaching ±0.02mm.
• Radius of Curvature Tolerance: ±0.3% as the standard factory specification, with manufacturing limits reaching ±0.2%.
• Surface Quality: Achieving a 20-10 level under factory standards, improving to a 10-5 level for higher demands.
• Irregularity: The common standard is 1/5 Lambda, with the limit for higher demands being less than 1/10 Lambda.
• Centration Deviation: Under normal factory conditions, centration can be controlled within 3 arcminutes (Arcmin), with manufacturing limits tightening to 1 Arcmin.

 

Achromatic Triplet Lenses play a crucial role in modern optical systems, especially in applications requiring high-precision imaging and chromatic aberration correction. Their high-quality design and manufacturing make them the preferred choice for many advanced optical applications.

Minimize Chromatic Aberrations for Sharp, Clear Images

These meticulously crafted optical components function by leveraging the dispersion properties of distinct glass materials to achieve near-perfect collimation of specific wavelengths across the visible spectrum. 

LaCroix manufactures and assembles thousands of achromatic lenses every week, including triplets and aspheric achromats.

Expertise in Achromats

• 4mm - 150mm
• Surface accuracies up to λ/20
• Centration to seconds

• Broad range of materials including optical glass (Schott, Ohara, Hoya, CDGM), fused silica, fused quartz, filter glass, and float glass.

• Optical engineering through manufacturing
• Custom truncations
• Off-axis spherical lenses

Achromat Applications

Surgical loupes Microscopy Multi-spectral imaging Telescopes LASIK devices Machine vision Ophthalmology Threat detection Laser target designators

What is an Achromat?

An achromat combines a convex lens and a concave lens, often made with different materials with different refractive properties, to focus light to the same spot, correcting for chromatic aberration and resulting in a sharper image.

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