Universität zu Köln

Arriola, Alexander, Mukherjee, Sebabrata ORCID: 0000-0003-1942-2521, Choudhury, Debaditya, Labadie, Lucas ORCID: 0000-0001-5342-5713 and Thomson, Robert R. (2014). Ultrafast laser inscription of mid-IR directional couplers for stellar interferometry. Opt. Lett., 39 (16). S. 4820 - 4823. WASHINGTON: OPTICAL SOC AMER. ISSN 1539-4794

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Abstract

We report the ultrafast laser fabrication and mid-IR characterization (3.39 mu m) of four-port evanescent field directional couplers. The couplers were fabricated in a commercial gallium lanthanum sulfide glass substrate using sub-picosecond laser pulses of 1030 nm light. Straight waveguides inscribed using optimal fabrication parameters were found to exhibit propagation losses of similar to 0.8 dB.cm(-1). A series of couplers were inscribed with different interaction lengths, and we demonstrate power-splitting ratios of between 8% and 99% for mid-IR light with a wavelength of 3.39 mu m. These results clearly demonstrate that ultrafast laser inscription can be used to fabricate high-quality evanescent field couplers for future applications in astronomical interferometry. (C) 2014 Optical Society of America

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Arriola, Alexander UNSPECIFIED UNSPECIFIED UNSPECIFIED Mukherjee, Sebabrata UNSPECIFIED orcid.org/0000-0003-1942-2521 UNSPECIFIED Choudhury, Debaditya UNSPECIFIED UNSPECIFIED UNSPECIFIED Labadie, Lucas UNSPECIFIED orcid.org/0000-0001-5342-5713 UNSPECIFIED Thomson, Robert R. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-431974
DOI:	10.1364/OL.39.004820
Journal or Publication Title:	Opt. Lett.
Volume:	39
Number:	16
Page Range:	S. 4820 - 4823
Date:	2014
Publisher:	OPTICAL SOC AMER
Place of Publication:	WASHINGTON
ISSN:	1539-4794
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics I
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language GUIDE-BRAGG GRATINGS; WAVE-GUIDES; ASTRONOMICAL INSTRUMENTS; CHALCOGENIDE GLASS; PHOTONIC CIRCUITS; FEMTOSECOND LASER; WRITTEN; IMAGES Multiple languages Optics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/43197