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ISO/TC 172/SC 9 N 752, ISO/NP 22247 Optics and Photonics - Effective numerical aperture of laser lenses - Definition and verification procedure

Scope

This international standard covers terms, definitions, and a verification procedure to characterize the ability of laser lenses to collimate divergent laser beams and to focus collimated laser to small spot sizes. The aim of this standard is to give users reliable information on the applicability of laser lenses in the field of beam forming.

Purpose

In the laser market, lenses with a high numerical aperture are required for collimating highly divergent laser radiation and for focusing down to very small spot sizes. In the best case these lenses do not reduce the laser beam quality. But a clear definition of the numerical aperture is missing and there is no measuring principle for it. Therefore, laser manufacturers and laser applicators cannot be sure whether a lens meets their needs unless they have purchased it. This standard gives users of high numerical aperture lenses the necessary information as to whether the lens is suitable for their specific application. It also allows verifying the quality and specification of a lens claimed by a supplier.

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