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Lenses

Spherical lenses are transparent optical components consisting of one or more pieces of optical glass with surfaces curved to converge or diverge the transmitted rays from an object, thus forming a real or virtual image of that object. Lenses are classified as single lenses, cylindrical lenses and achromatic lenses according to the different applications. Dream Lasers provides these lenses with the material of BK7, fused silica, sapphire and CaF2. Special focusing systems are able to be designed by Dream Lasers' engineers upon requirement.

Lenses	Materials	Illustration	Property and Application
Plano-Convex	BK7 Fused Silica Sapphire CaF₂		Positive focus length. Most suitable where one conjugate is more than five times the other, e.g. in sensor application or for use with near collimated light. Also where both conjugates are on the same side of the lens, e.g. as an add-on lens to increase the numerical aperture.
Double-Convex	BK7 Fused Silica		Most suitable where the conjugates are on opposite sides of the lenses and the ratio of the distances is less than 5:1, e.g. as simple image relay components.
Plano-Concave	BK7 Fused Silica Sapphire CaF₂		Negative lens with the form most suitable where one conjugates is more than five times the other, e.g. producing divergent light from a collimated input beam.
Double-Concave	BK7 Fused Silica		Negative lens with the form most suited to producing diverging light or a virtual image, where the input light is converging.
Meniscus	BK7 Positive		These lenses may be used to increase the numerical aperture of a positive lens assembly, without an undue increase in the aberrations.
Meniscus	BK7 Negative		The best lens form where one conjugates is relatively far from the lens or where both conjugates are the same size of the lens.
Cylindrical	BK7 Fused Silica		Used to provide focusing power in one section only. For illumination or detection of light from line sources. Also used to anamorphic compression of beams and images.
Achromatic	Combinations of Two Optical Grade Glasses		These lenses have considerably reduced values of spherical aberration. Coma and chromatic aberration. Best used to replace single components where performance must be improved.
Ring Mount for Lenses	Black Anodized Aluminum		Used to fix position of lenses.

	Please refer to the Material Chapter for more information about BK7 glass, UV grade fused silica, Sapphire and CaF2.
	Please refer to the Glossary and Technology for more information about lenses.
	Please refer to Coating Chapter for more infomation of coating.
	Other Material: Ge, Si, ZnSe, ZnS, MgF₂, GaAs are available upon request.