Spectratech Inc.

Carmelo J Aresco

David R Shafer

A modified Schwarzschild Casegrainian objective reflects radiant energy between the primary and secondary mirror two times to form a four reflection optical path. The four reflection optical path increases the magnification of the objective without making the working distance that separates the secondary mirror from the sample unacceptably small. The four reflection optical path maintains good image quality at high numerical aperture due, at least in part, to the relatively small size of a microscopic object. The objective functions as a zoom lens by changing the location of a remote field stop along the optical axis of the objective and refocusing because the emerging beam of radiant energy is nearly collimated along the optical axis at the field stop. The reflecting objective also obtains variable magnification by converting to a two reflection mode of operation by increasing the separation of the primary mirror from the secondary mirror from the sample image plane. The two reflection mode provides for less magnification than obtained with the four reflection mode.

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Cromwell, CT, United States of America

Carmelo J Aresco