Crown Glass Spherical Lenses
Description
Crown Glass Spherical Lenses are optical components designed to focus or diverge light. These lenses are typically made from crown glass, a type of optical glass known for its low dispersion properties. The lenses can be manufactured in various shapes, such as plano-convex, double convex, and plano-concave, each serving different optical functions based on their curvature and design.
Working Principle
Crown Glass Spherical Lenses work by refracting light that passes through them. The curvature of the lens surfaces causes light rays to converge or diverge, depending on the lens type. Positive lenses, like plano-convex and double convex, have positive focal lengths and are used to converge light. The spherical shape of these lenses helps in minimizing spherical aberration, especially when used with an ideal conjugate ratio of less than 5:1. This makes them useful for applications requiring precise light collimation and monochromatic illumination.
Applications
Crown Glass Spherical Lenses are used in a variety of optical applications. For instance, plano-convex lenses are often employed in light collimation systems and for focusing light in laser applications. Double convex lenses are used in imaging systems where light needs to be focused from a distant source. These lenses are also integral in optical instruments like microscopes and telescopes, where precise light manipulation is crucial.
Advantages over other Spherical Lenses
Crown Glass Spherical Lenses offer several advantages over other types of spherical lenses. Their low dispersion properties reduce chromatic aberration, making them suitable for applications requiring high optical clarity. The ability to minimize spherical aberration with specific conjugate ratios enhances their performance in demanding optical setups, such as those requiring precise light collimation.
Limitations
One limitation of Crown Glass Spherical Lenses is their susceptibility to surface defects like scratches, which can affect optical performance. The MIL-0-131830A(1963) standard specifies the types of surface defects that can occur, which include scratches with lengths many times their widths. These defects can degrade the quality of the transmitted light and reduce the lens's effectiveness in high-precision applications.
Considerations
When considering Crown Glass Spherical Lenses, it is important to evaluate factors such as initial costs, operating expenses, and maintenance requirements. Crown glass lenses are generally durable, but their optical surface quality must be maintained to ensure accuracy. Replacement and maintenance costs can vary depending on the application and the environmental conditions in which the lenses are used. Proper handling and regular cleaning are essential to maintain their optical performance over time.
from Gurley Precision Instruments
Aspheres minimize spherical aberrations, Broadband coatings are recommended for aspherical lenses [See More]
- Materials: Crown Glass
- Focal Length: 23.5
- Lens Form: Aspherical-Convex
- Diameter: 32.5
from UNI OPTICS(Fujian) Co., Ltd
Achromatic Lenses are used to minimize or eliminate chromatic aberration. The achromatic design also helps minimize spherical aberrations. Achromatic Lenses are ideal for a range of applications, including fluorescence microscopy, image relay, inspection, or spectroscopy. Achromatic Lenses, which... [See More]
- Materials: Crown Glass; Flint Glass
- Diameter: 6 to 25.4
from Qioptiq
Precision lenses for use at infinite object distance. Spherical (aperture-dependent) aberration minimized. N-BK7 lenses with ARB2 coating. Lens mounts fit to Microbench or Nanobench system. Broadband anti-reflection coating ARB2 for the visible spectral range (R < 0.5 % for λ = 450-700 nm... [See More]
- Materials: Crown Glass; N-LaF2
- Lens Application: Visible
- Lens Form: Convex-Convex
- Focal Length: 4 to 20
from HG Optronics, Inc.
Achromatic Lenses are used to minimize or eliminate chromatic aberration. The achromatic design also helps minimize spherical aberrations. Achromatic Lenses are ideal for a range of applications, including fluorescence microscopy, image relay, inspection, or spectroscopy. Achromatic Lenses, which... [See More]
- Materials: Crown Glass; Flint Glass; Crown Glass&Flint Glass CDGM, Schott, Ohara etc
- Diameter: 6 to 25.4
- Focal Length: -50 to 120
- Surface Quality: 20-10 Scratch / Dig; 60-40 Scratch / Dig
from ECOPTIK (CHANGCHUN) LTD
Achromatic Lenses are used to minimize or eliminate chromatic aberration. The achromatic design also helps minimize spherical aberrations. Achromatic Lenses are ideal for a range of applications, including fluorescence microscopy, image relay, inspection, or spectroscopy. An Achromatic Lens, which... [See More]
- Materials: Crown Glass; Flint Glass; Optical Glass
- Focal Length: 50 to 2000
- Lens Application: Visible
- Diameter: 6 to 200
from Ross Optical Industries
Negative Achromats consist of two optical components, a crown and a flint glass lens, cemented together. The crown is usually a bi-concave lens. As is true to all Achromats, they are corrected for color and on-axis spherical aberration. They are used predominantly to extend focal lengths in... [See More]
- Materials: Crown Glass; Flint Glass
- Lens Application: Infrared (optional feature); Visible; Ultraviolet (optional feature)
- Lens Form: Concave-Concave
- Focal Length: -20
from Qioptiq
Precision lenses for use at infinite object distance. Spherical (aperture-dependent) aberration minimized. N-BK7 lenses with ARB2 coating. Broadband anti-reflection coating ARB2 for the visible spectral range (R < 0.5 % for λ = 450-700 nm on lenses made of N-BK7). Tolerances: Focal length... [See More]
- Materials: BK7 Glass; Crown Glass; N-LaF2
- Lens Application: Visible
- Lens Form: Convex-Convex
- Focal Length: 4 to 150
from ECOPTIK (CHANGCHUN) LTD
A cemented cylindrical lens can minimize chromatic aberration, so it can be used to focus a single direction of a multi-color light beam. Unlike a spherical lens that produces a point focusing spot, a cylindrical lens can produce a linear focusing spot. Our cylindrical achromatic doublets are... [See More]
- Materials: Crown Glass; Flint Glass
- Diameter: 6 to 200
- Focal Length: 50 to 2000
- Center Thickness: 2 to 50
from Ross Optical Industries
These Achromats are not only corrected for spherical aberration and axial color as the standard Achromats but also corrected for coma. This combination makes them Aplanatic in nature and allows for better optical performance. They are used as laser focusing objectives and in electro-optical and... [See More]
- Materials: Crown Glass; Flint Glass
- Lens Application: Infrared (optional feature); Visible; Ultraviolet (optional feature)
- Lens Form: Convex-Convex
- Focal Length: 6
from Qioptiq
Crown glass is primarily for use in illumination systems. Positive meniscus lenses. Surfaces uncoated. For customized optics and higher volumes please contact our sales team for your individual quotation. [See More]
- Materials: Crown Glass; B270, N-ZK7, N-BaK
- Focal Length: 50 to 150
- Lens Form: Concave-Convex
- Diameter: 22.4 to 40
from Ross Optical Industries
The Steinheil triplets are made of a low index crown element cemented in between two identical meniscus flint elements. Specially designed for 1:1 conjugation, they perform well for conjugate ratios up to 5. These lenses make good relay optics for both on- and off-axis application and are often used... [See More]
- Materials: Crown Glass; Flint Glass
- Lens Application: Infrared (optional feature); Visible; Ultraviolet (optional feature)
- Lens Form: Convex-Convex
- Focal Length: 7.5