| QUARTZ LENSES-UV INSTRUMENT GRADE
These precision, pitch polished, fused quartz lenses are offered in two forms: plano-convex and bi-convex, in a variety of diameters and focal lengths. These two kinds of lenses are spherically manufactured for use in optical instruments covering the UV through the near infrared spectral regions, 0.2µ to 2.7µ. The lenses are made of fused quartz because optical glass has a UV cutoff at 0.34µ. Quartz UV transmission is greater than 80% at 0.2µ and greater than 95% from 0.3µ to 2.5µ.
Although these particular elements are designed for normal radiation imaging over the maximum spectral region, they are also used in laser systems where the super precision of the laser lens series is not required. In particular, the plano-convex form in Series 005 has a shape which is very close to “best form” lenses when the object is at infinity. This means that spherical aberration will be close to a minimum possible in a single element lens system.
The bi-convex form of these lenses, Series 006, is offered for finite conjugate imaging applications. The reason for this is that the spherical aberration is almost at a minimum in the bi-convex form for a lens operating with the object and image distances being a low multiple of the focal length.
It is recommended that in finite imaging applications, such as relay lenses, field lenses and simple camera systems, bi-convex lenses be specified.
When one conjugate is a high multiple of the equivalent focal length, as in laser spot formation, telescope objectives and magnifiers, a plano-convex form should be used with the convex side facing the object, or long conjugate direction.
Republic Lens Optical Products, Inc., offers a large variety of antireflection coatings for these lenses. They range from specific laser “V” coats to broadband AR coatings in the visible and UV regions.
We will also grind these lenses to fit specific cell sizes and we will manufacture special lenses to fit a particular customer’s requirements. Please contact our Application Engineers for further details.
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