Peter Chrusch


This thesis addresses the problem of contrast in scanning optical microscopy by resorting to differential imaging. The use of a unique, two-wavelength laser as the coherent source in a scanning format is investigated. In particular, it is shown that the TEM10 mode of this laser provides a novel method for performing simultaneous conventional and differential microscopy. Results are presented on the use of the laser for performing differential imaging. In addition, the technique is extended to encompass a second, tunable, laser. Rather than performing electronic differentiation, the TEMi0 mode of this, second, laser provides an in-situ, optical differential microscope. Two different optical configurations are implemented, one system relies on electronic differentiation, while the second differentiates optically. These techniques could have special applications in general microscopy, and precision metrology.

Library of Congress Subject Headings

Microscopy; Gaussian beams; Optical scanners

Publication Date


Document Type


Department, Program, or Center

Chester F. Carlson Center for Imaging Science (COS)


Iravani, Mehdi Vaez


Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works. Physical copy available through RIT's The Wallace Library at: QH205.2 .C488 1990


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