A plano-concave lens converts a parallel beam of light into a diverging beam of light, which is back-focused at the imaginary focal point of the plano-concave lens with negative focal length, where one side is flat and the other side is concave. Flat-concave lens can be scattered from the imaginary focus of a collimated beam, usually used in Galileo type beam expander. When used, the concave side faces the direction of the incident light, and the flat side is oriented toward the focal plane to be dealt with. Flat concave lenses have a negative focal length and negative spherical aberration, and can be used to counteract the aberration of other lenses in the system.

A plano-convex lens will focus parallel rays of light into a point which is the focal point of the lens. It is characterized by a positive focal length, where one side is flat and the other is convex. When used, the convex side is usually facing the incident light, because the light incident on both sides of the plano-convex lens is slightly different in refractive index, so the focal length of the two sides is also different, in order to minimize the spherical aberration, should try to make the beam of light from the curved surface of the incidence. Plano-convex lenses are often used for aiming and focusing monochromatic light sources, converging parallel light, or converting scattered point light sources into parallel light.

Biconcave lens can disperse the parallel incident beam outward, with a negative focal length, consisting of two concave surfaces of equal curvature, commonly used for beam expansion, collimation, projection and expansion of the focal length of the optical system. Biconcave lenses have a negative focal length and are suitable for dispersing converging beams, also known as dispersive lenses or negative spherical lenses. A biconcave lens can diverge a collimated beam to an imaginary focal point and is commonly used in Galilean beam expanders.

A K9 glass biconvex lens is a lens made of K9 optical glass with a biconvex shape. It is commonly used in applications such as imaging, beam expansion or reduction, and convergence, and is often used to focus a collimated beam or to collimate a point light source.

It is characterized by high purity, high light transmission, thermal stability and low refractive index, making it a good performer in optical applications. The design of the biconvex lens enables parallel beams to converge at a single point and is commonly used in laser systems to increase the focusing of the beam.

Description:

Double Convex Lenses (Double Convex Lenses) consist of two convex surfaces of equal radius that focus light into a single point with positive focal length. Due to the symmetrical shape of the two sides, it becomes a more suitable unit piece for 1:1 imaging applications. They are commonly used in imaging relay systems and for imaging objects at finite conjugate distances or for focusing, collimating, and expanding beams. Biconvex lenses are characterized by the fact that the greater the conjugate ratio, the greater the aberration produced. Biconvex lenses are used where the object and image are on opposite sides of the lens and the ratio of image distance to object distance (conjugate ratio) is between 0.2 and 5.

Meniscus Lenses are concave-convex lenses. The lens has a convex surface and a concave surface. If the curvature of the convex side is greater than the curvature of the concave side, the lens has a positive focal length and is used as a magnifier; if the curvature of the concave side is greater and the curvature of the convex side is less, then it is a negative meniscus lens, which can be used in place of other negative lenses. The curved moon lens is used to minimize spherical aberration to a greater extent, and can obtain a smaller focus and less aberration than the plano-convex lens to improve the image quality. When used in combination with another lens, a positively curved moon lens can shorten the focal length, thereby increasing the numerical aperture (NA) of the system without introducing significant spherical aberration. When used to converge collimated light, the convex side of the lens should face the light source.

Product details: positive curved moon lens characteristics:

A positively curved moon lens consists of two curved surfaces of similar radius of curvature with positive focal length. It is often used to reduce the focal length of the other lens, increase the numerical aperture, and other related applications. To reduce spherical aberration, the beam should be incident on the convex side of the lens for beam expansion or reduction or divergence collimation applications, and on the concave side for convergence collimation.

Positively curved moon lenses are primarily used to minimize spherical aberration. When used in combination with another lens, the positively curved moon lens reduces the focal length and increases the numerical aperture (NA) of the system without introducing significant spherical aberration. When used to converge parallel light, to minimize spherical aberration the convex surface of the lens should be oriented in the direction of the light source emission. Coated lenses are also widely used in visible and near infrared applications.

Negative Moon Bend Lens Characteristics:

Negative curved moon lenses are concave lenses, i.e., both sides of the lens are inwardly concave surfaces.

A negatively curved moon lens causes parallel light rays to diverge and appear to come from the focal point, so it has a negative focal length. This type of lens is often used to disperse light, to reduce the seeming size of an object, or to correct visual problems such as myopia.

A negatively curved moon lens causes light rays to bend outward as they pass through the lens, creating a negative spherical aberration. This causes it to produce a shrinking effect when imaging, making objects appear smaller.

In conclusion, positive and negative curved moon lenses have different uses and effects in optical applications. Positively curved moon lenses focus light and make objects appear larger, while negatively curved moon lenses disperse light and make objects appear smaller. They are key elements in optical systems and are used in a variety of applications including photography, eyeglasses, microscopes and telescopes.

(H-FK61 H-ZLAF H-LAF H-LAK ) Difficult (H-ZF H-F) Normal