Infrared antireflective filtering for extreme ultraviolet multilayer Bragg reflectors

Medvedev, V.V. and Yakshin, A.E. and Kruijs van de, R.W.E. and Krivtsun, V.M. and Yakunin, A.M. and Koshelev, K.N. and Bijkerk, F. (2012) Infrared antireflective filtering for extreme ultraviolet multilayer Bragg reflectors. Optics letters, 37 (7). 1169 - 1171. ISSN 0146-9592

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Abstract:	An extreme ultraviolet multilayer mirror with an integrated spectral filter for the IR range is presented and experimentally evaluated. The system consists of an IR-transparent B4C/Si multilayer stack which is used both as EUV-reflective coating and as a phase shift layer of the resonant IR antireflective (AR) coating. The AR coating is optimized in our particular case to suppress CO2 laser radiation at a wavelength of 10.6 μm, and a suppression of more than two orders of magnitude is demonstrated. The method allows high suppression over a large angular acceptance range, relevant for application in lithography systems.
Item Type:	Article
Copyright:	© 2012 Optical Society of America
Faculty:	Science and Technology (TNW)
Research Group:	Laser Physics and Nonlinear Optics (LPNO)
Link to this item:	http://purl.utwente.nl/publications/81721
Official URL:	http://dx.doi.org/10.1364/OL.37.001169
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