作者
Simon Gross, Nemanja Jovanovic, Adam Sharp, Michael Ireland, Jon Lawrence, Michael J Withford
发表日期
2015/3/23
期刊
Optics Express
卷号
23
期号
6
页码范围
7946-7956
出版商
Optica Publishing Group
简介
Photonic technologies will be at the heart of future terrestrial planet hunting interferometers. In particular the mid-infrared spectral region between 3.5 – 4.2 μm is the ideal window for hunting for young extra-solar planets, since the planet is still hot from its formation and thus offers a favorable contrast with respect to the parent star compared to other spectral regions. This paper demonstrates two basic photonic building blocks of such an instrument, namely single-mode waveguides with propagation losses as low as 0.29±0.03 dB/cm at a wavelength of 4 μm as well as directional couplers with a constant splitting ratio across a broad wavelength band of 500 nm. The devices are based on depressed cladding waveguides inscribed into ZBLAN glass using the femtosecond laser direct-write technique. This demonstration is the first stepping stone towards the realization of a high transmission mid-infrared nulling …
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S Gross, N Jovanovic, A Sharp, M Ireland, J Lawrence… - Optics Express, 2015