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  • Optical Coherence Imaging Techniques and Imaging in Scattering Media III
  • SPIE Proceedings (Optica Publishing Group, 2019),
  • paper 11078_31
  • https://doi.org/10.1117/12.2527047

840-nm Combined-SLED Source integrated in 14-pin Butterfly Module with 140-nm Bandwidth

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Abstract

We demonstrate an 840-nm broadband and compact light source with 140 nm FWHM optical bandwidth and 8 mW of output power, realized with three superluminescent diodes (SLEDs) that are, to our knowledge for the first time, integrated on a free-space, micro-optical bench in a standard 14-pin butterfly package. The three SLED chips at 790 nm, 840 nm and 880 nm are mounted on a ceramic baseplate that is temperature-stabilized by a thermo-electric cooler. The light output of the SLEDs is collimated by micro-optical collimation lenses, spectrally combined through free-space dielectric edge filters and focused into a HI-780 single-mode fiber. The combined broadband spectrum corresponds to a coherence length of 2.9 µm in air, suitable for ultra-high-resolution OCT systems.

© 2019 SPIE/OSA

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