Daheng Optics Cylindrical Lenses Windows GCL-0101 BK7 Plano-Convex Lenses GCL-0102 BK7 Bi-Convex Lenses GCL-0103 BK7 Plano-Concave Lenses Crystal components GCL-0104 BK7 Bi-Concave Lenses GCL-0105 BK7 Meniscus Lenses GCL-0106 Positive Achromatic Doublets GCL-0107 Negative Achromatic Doublets GCL-0108 Fused Silica Plano-Convex Lenses GCL-0109 Fused Silica Plano-Concave Lenses GCL-0111 Calcium Fluoride Plano-Convex Lenses GCL-0121 Zinc Selenide Plano-Convex Lenses GCL-0131 Germanium Plano-Convex Lenses

General Lens is an optical device with perfect or approximate axial symmetry which transmits and refracts light, converging or diverging light. There are many forms of a lens or a lens system. A simple lens consists of a single optical element. A compound lens or a lens system has a series of simple lenses (elements) with a common axis in order to correct optical aberrations to improve performances or image quality, of which a simple single lens cannot offer. Prisms Cylindrical Windows CrYstal Prisms Lenses window components Name Legend All dimensions are in mm unless otherwise...

Daheng Optics GCL-01 Lenses Materials Most glass manufacturers can supply the same characteristics of materials under different trade names. They modify their material processes to achieve lead- and arsenic-free. Daheng Optics utilizes many glass materials from main international manufacturers in our products. We source mainly in China with CDGM glasses which was founded in 1956 and is the largest production base of optical materials in China with its highest glass output in the world in recent years. With the constant efforts on development for new products and pursuing quality perfection, more...

AR coatings Coating Description Specifications Blackened Edges Eliminate stray light and improve Principle of Anti-reflection Coating The transmission properties of an optical coating are dependent upon the wavelength of light being used, index of refraction of the substrate, index of refraction of the coating, the thickness of the coating, and the angle of the incident light. AR coating is designed to reduce back reflection at, say, air and glass interface caused by the difference of refractive index of the two media. The AR coating design is such that the relative phase shift between the...

Daheng Optics GCL-01 Lenses 1/4 Wave MgF2 Coating The coatings of VIS 0° for 0° angle of incidence and VIS 45° for 45° angle of incidence provide optimized transmission for wavelength 425-675nm, achieving average reflection to 0.4% and 0.75%, respectively. Multiple Layers of AR Coating In order to increase transmission further, comparing with a single layer of AR coating, a triple-layer design is generally used with coating materials of MgF2, Ta2O5 and Al2O3. Accessory: GCM-04 Self-Centering Lens Holders GCM-05 Adjustable Self-Centering Lens Holders GCM-0801 Lens/Mirror Mounts GCM-0802 Small...

Plano-convex lenses are mostly used for focusing parallel rays of light to a spot. The asymmetry of these lenses between the front and back surface minimizes spherical aberration effectively, particularly in the situations where the object and image are not at equal distance from the lens. The optimum case is where the object is placed at infinity (regarded as parallel rays entering lens) and the image is on the focus, which has infinite conjugate ratio, i.e. object distance/image distance. The curved surface of the lens should face the object direction. Te f: focal length (object side) f': focal...

Daheng Optics 0012 China Daheng Group. Inc. www.cdhcorp.com

All dimensions are in mm unless otherwise specified. 13

Daheng Optics GCL-01 Lenses GCL-0101 BK7 Plano-Convex Lenses Part No. 0014 China Daheng Group. Inc. www.cdhcorp.com All dimensions are in mm unless otherwise specified.

GCL-01 Lenses GCL-0102 BK7 Bi-Convex Lenses Similar to plano-convex lenses, a bi-convex lens has a positive focal length and focuses parallel rays of light to a spot. Because the front and back surface of the lens are spherically convex and have the same radius of curvature, in situations where the object and image are at equal of near equal distances from the lens, it particularly minimizes spherical aberration, at the same time, aberration coma and distortion are also identically canceled. As a guideline, bi-convex lenses offer minimum aberrations at the conjugate ratio between 5:1 and 1:5....

Daheng Optics 0016 China Daheng Group. Inc. www.cdhcorp.com All dimensions are in mm unless otherwise specified.

GCL-0103 BK7 Plano-Concave Lenses A plano-concave lens diverges parallel input rays. It has a negative focal length. While the output rays do not actually meet to form a point, they do appear to be diverging from a virtual image located on the object side of the lens. At absolute conjugate ratio greater than 5:1 and less than 1:5, plano-concave lenses are nearly the best form lens to reduce spherical aberration, coma, and distortion. The curved surface of the lens should face the object in distance or infinite conjugate, except in a high energy laser system, this should be reversed to eliminate...

Daheng Optics GCL-01 LensesGCL-0103 BK7 Plano-Concave Lenses Part No. f fb Tc Te 0018 China Daheng Group. Inc. www.cdhcorp.com All dimensions are in mm unless otherwise specified.

GCL-0104 BK7 Bi-Concave Lenses Similar to plano-concave lenses, a bi-concave lens diverges parallel input rays and has a negative focal length. It has a virtual focus at the object side of the lens. Bi-concave lenses are usually suitable for absolute conjugate ratios closer to 1:1, f: focal length (object side) f': focal length (image side) fb: back focal length (S): lens diameter Tc: center thickness Te: edge thickness F,F': focal points H,H': principal points • Material: • Focal Length (f'): • Diameter(0) Tolerance: • Center Thickness (Tc): • Centration: • Form Error: • Irregularity of Fringes: •...

Daheng Optics GCL-01 LensesGCL-0104 BK7 Bi-Concave Lenses Part No. f fb Tc Te 0020 China Daheng Group. Inc. www.cdhcorp.com All dimensions are in mm unless otherwise specified.