Interferometry with VUV wavelengths

Wolfgang Emer; Johannes Schwider

doi:10.1117/12.312937

30 June 1998 Interferometry with VUV wavelengths

Wolfgang Emer, Johannes Schwider

Proceedings Volume 3478, Laser Interferometry IX: Techniques and Analysis; (1998) https://doi.org/10.1117/12.312937
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

To improve the resolution and the sensitivity of optical metrology an interferometer for VUV wavelengths was realized. To examine the influence of the wavelength especially with regard to the period of the object structure, an apochromatic design was chosen. This means an object can be measured with wavelength from 157nm up to 900nm without changing the optical setup. The design of this interferometer will be presented. The benefits and also the technological problems which come along with the use of VUV wavelengths are discussed. Further problems occur when deep binary structures are measured. An overview of those problems will be given and the use of white light interferometric methods to overcome those problems will be discussed. Measurements have been performed with different light sources. The wavelength scale is extended from the visible to the deep UV, the coherence properties of the sources are very dissimilar and the interferograms are evaluated with different techniques. The experimental results will be presented and discussed.

Citation Download Citation

Wolfgang Emer and Johannes Schwider "Interferometry with VUV wavelengths", Proc. SPIE 3478, Laser Interferometry IX: Techniques and Analysis, (30 June 1998); https://doi.org/10.1117/12.312937

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