Journal
OPTICS EXPRESS
Volume 20, Issue 15, Pages 17029-17043Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.20.017029
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Funding
- Australian Research Council Centre of Excellence for Ultrahigh Bandwidth Devices for Optical Systems [CE110001018]
- OptoFab node of the Australian National Fabrication Facility (ANFF)
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We report on the fabrication and characterization of composite multimode waveguide structures that consist of a stack of single-mode waveguides fabricated by ultrafast laser inscription. We explore 2 types of composite structures; those that consist of overlapping single-mode waveguides which offer the maximum effective index contrast and non-overlapped structures which support multiple modes via strong evanescent coupling. We demonstrate that both types of waveguides have negligible propagation losses (to within experimental uncertainty) for light injected with focal ratios >8, which corresponds to the cutoff of the waveguides. We also show that right below cutoff, there is a narrow region where the injected focal ratio is preserved (to within experimental uncertainty) at the output. Finally, we outline the major application of these highly efficient waveguides; in a device that is used to reformat the light in the focal plane of a telescope to a slit, in order to feed a diffraction-limited spectrograph. (C) 2012 Optical Society of America
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