Hybrid sol-gel technology for fast prototyping in astronomical interferometry

• Type: Article in International Conference Proceedings Book
• Date: 2010

Authors

Ghasempour, A (Author) Other; Leite, AMP (Author) FCUP; Alexandre, D (Author) Other; Reynaud, F (Author) Other; Marques, PVS (Author) FCUP; Garcia, PJV (Author) FEUP

Conference proceedings International

Title: Proceedings of SPIE-The International Society for Optical Engineering

Conference on Optical and Infrared Interferometry II

San Diego, CA, JUN 27-JUL 02, 2010

Indexing

ISI Web of Knowledge - 0 Citations

Scopus - 0 Citations

Scientific classification

FOS: Engineering and technology > Electrical engineering, Electronic engineering, Information engineering

Other information

Authenticus ID: P-003-C76

DOI: 10.1117/12.857143

Abstract (EN): Hybrid sol-gel technology was used for fabrication of prototypes of coaxial two, three and four telescopes beam combiners for astronomical applications. These devices were designed for the astronomical J-band and have been characterized using an optical source with emission centered at 1265 nm and with a spectral FWHM of 50 nm. Interferometric characterization of the two, three and four beam combiners, showed average contrasts respectively higher than 98%, 96% and 95%. Interferometric spectral analysis of the beam combiners revealed that the chromatic differential dispersion is the main contributor to the observed contrast decay in the latter cases. The laser direct writing technique was used for fabrication of a coaxial two beam combiner on sol-gel material; it showed a contrast of 95%. The measured high contrast fringes confirm that the procedures used lead to performant IO beam combiners. These results demonstrate the capabilities of the hybrid sol-gel technology for fast prototyping of complex chip designs for astronomical applications.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6