Lenses have many applications ranging from the simple collection of the scanning of laser beams to precise imaging and image transfer. CRYSTECH provide these lenses for different application.

Lenses		Materials	Illustration	Property and Application
Plano-convex		BK7 Fused Silica 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.
Double-convex		BK7 Fused Silica CaF2		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		Fused Silica		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 CaF		Negative lens with the form most suited to producing diverging light or a virtual image, where the input light is converging.
Meniscus	Positive	BK7		These lenses may be used to increase the numerical aperture of a positive lens assembly, without an undue increase in the aberrations.
	Negative	BK7		The best lens form where one conjugates is relatively far from the lens or where both conjugates are the same size of the lens.
Cylindical		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.

Specification for lenses (Cylindrical Lenses)
Material: BK7 ( Or Fused Silica)
Design Wavelength: 546.1nm (632.8 nm for Cylindrical lenses )
Design Index: 1.5183 ±0.0005 (1.5147 for Cylindrical lenses)
Flatness: l/4@632.8nm (x: l/2; y: 2l for Cylindrical lenses)
Diameter Tolerance: +0.0, -0.15mm
Paraxial Focal Length:±2%
Center tolerance: 3 arc minutes
Clear Aperture: >80%
Surface Quality: 60-40 scratch and dig
Bevel: 0.25 mm x 45°

Standard Products