Low loss mid-infrared ZBLAN waveguides for future astronomical applications

Simon Gross, Nemanja Jovanovic, Adam Sharp, Michael Ireland, Jon Lawrence, Michael J. Withford

Research output: Contribution to journalArticlepeer-review

52 Citations (Scopus)


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 mm 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 mm 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 interferometer.

Original languageEnglish
Pages (from-to)7946-7956
Number of pages11
JournalOptics Express
Issue number6
Publication statusPublished - 23 Mar 2015


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