From prototype to production, Focus Technology designs, manufactures, and coats spherical lenses. Spherical lenses are one of the most basic optical components to produce. With complete in-house capabilities, Focus is able to offer spherical lenses at the lowest pricing with fast delivery times.

Bi-Concave Lens is just like the Plano-Concave lens that are used to produce divergent light. The Bi-Concave is widely used when the input beam is converging.

Technical Parameters:

	GENERAL	HIGH PRECISION
Material	N-BK7, CDGM H-K9L, Fused silica, CaF2, Sapphire
Design wavelength	546.07nm
Design index (bk7)	1.51680 for BK7, 1.45846 for Fused Silica
Diameter tolerance	+0.0, 0.15mm	+0.0, 0.05mm
Paraxial focal length	±2%	±0.5%
Centration	<3'	<1'
Clear aperture	80%	90%
Surface quality	60-40 scratch and dig	10-5 scratch and dig
Surface irregularity	< λ/4	< λ/8
Protective bevel	0.25 + 0.25, -0.0mm	0.2 ± 0.1mm

Note for Lens:

(1). Lens made from materials such as N-BK7, Fused Silica, Sapphire, CaF2, Borofloat, or other optical glass supplied by Schott and Chinese CDGM are available upon request.

(2). Custom-made Lens at any size from Φ3.0mm to Φ200mm clear aperture are available, apart from round, Lens at shape of square are available as well.

(3). 90% clear aperture is available upon request.

(4). Better bevel is available upon request.

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