Optical Interference Coatings: Three Manufacturing Problems

J.A. Dobrowolski, Stephen Browning, Michael Jacobson and Maria Nadal

How can one produce a thin-film filter that reproduces irregular spectral transmittance and reflectance curves for near-normal incident light? How about filters intended for use at oblique angles of incidence? These problems were part of a unique thin-film manufacturing competition at OSA’s Topical Meeting on Optical Interference Coatings.


figure2001 manufacturing problem: A mountain range in the Canadian Rockies and its reflection in Bow Lake provide the target transmittances TD and reflectances RD for the manufacturing problem.

From time to time, the optical thin film community has organized competitions to test the state of the art in multilayer thin-film design. These design problems have become a tradition at OSA’s Topical Meeting on Optical Interference Coatings (OIC), in addition to round-robin measurements to assess the properties or performance of thin film multilayers or the optical constants of single thin films. Both of these exercises have helped the meeting participants to better understand certain aspects of optical thin-film design, and they have in fact advanced the state of the art.

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