10 Things to Consider When Buying achromatic doublet lens

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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.

 

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Manufacturing Materials and Processes

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.

Achromatic doublet lens is a kind of glass that can change the direction of light transmission and the relative spectrum of ultraviolet, visible or infrared light. In the narrow sense, achromatic bi-glued lens refers to achromatic bi-glued lens. Achromatic doublet lens can be used to fabricate lenses, prisms, mirrors and windows in optical instruments.

The difference between achromatic doublet lens and other glass is that it is a part of optical system and must satisfy the requirement of optical imaging. Therefore, the determination of the quality of achromatic doublet lenses also contains some special and stricter indicators.

1. Specific optical constants and consistency of optical constants of the same batch of glasses

Each kind of achromatic doublet lens has regular normative refractive index values for different wavelength light, which is the basis for optical planners to plan optical systems. Therefore, the optical constants of achromatic doublet lenses produced by factories must be within the allowable error range of these values, otherwise the imaging quality in practice will be inconsistent with the expected results in planning and the quality of optical instruments will be affected.

2.High transparency

The brightness of optical system imaging is proportional to the transparency of glass. The transparency of achromatic doublet lens to a certain wavelength of light is expressed in terms of light absorption coefficient K_ lambda. When light passes through a series of prisms and lenses, some of its energy is lost by the reflection of the interface of the optical parts, while others are absorbed by the medium (glass). Therefore, the primary way to improve the transmittance of an optical system with multiple thin lenses is to reduce the reflection loss of the lens surface, such as coating the antireflective film on the lens surface.

Each kind of achromatic doublet lens has regular normative refractive index values for different wavelength light, which is the basis for optical planners to plan optical systems. Therefore, the optical constants of achromatic doublet lenses produced by factories must be within the allowable error range of these values, otherwise the imaging quality in practice will be inconsistent with the expected results in planning and the quality of optical instruments will be affected.The brightness of optical system imaging is proportional to the transparency of glass. The transparency of achromatic doublet lens to a certain wavelength of light is expressed in terms of light absorption coefficient K_ lambda. When light passes through a series of prisms and lenses, some of its energy is lost by the reflection of the interface of the optical parts, while others are absorbed by the medium (glass). Therefore, the primary way to improve the transmittance of an optical system with multiple thin lenses is to reduce the reflection loss of the lens surface, such as coating the antireflective film on the lens surface.