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2/3 octave Si/SiO infrared dispersive mirrors open new horizons in ultrafast multilayer optics

Optics Express, ISSN: 1094-4087, Vol: 27, Issue: 1, Page: 55-62
2019
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Article Description

Dispersive mirrors operating in a broadband infrared spectral range are reported for the first time. The mirrors are based on Si/SiO thin-film materials. The coatings exhibit reflectance exceeding 99.6% in the spectral range from 2 to 3.2 µm and provide a group delay dispersion of −100 fs and −200 fs in this range. The fabricated mirrors are expected to be key elements of Cr:ZnS/Cr:ZnSe femtosecond lasers and amplifiers. The mirrors open a new avenue in the development of ultrafast dispersive optics operating in the infrared spectral range.

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