Single mode chalcogenide glass fiber as wavefront filter for the DARWIN planet finding misson
conference paper
The development of single mode chalcogenide glass fibers as wavefront filter for the DARWIN mission is reported. Melting procedures and different preform techniques for manufacturing core-cladding chalcogenide fibers are described. Bulk glass samples on the basis of Te-As-Se- and high Te-compositions have been characterized optically, by measurement of the absorption spectrum and the refractive index in the region 4 – 20 μm. Several chalcogenide core-cladding glass fiber configurations have been drawn and examined by microscopy. The mode propagation behaviour and numerical aperture of fiber samples have been determined by far field intensity distribution measurements, using a CO2 laser at 10.6 μm. Single mode waveguide performance has been demonstrated for several fiber samples, coated with an absorbing Gallium layer for stripping of cladding modes.
Topics
TNO Identifier
784929
ISSN
0277786X
ISBN
9781510616233
Publisher
SPIE
Article nr.
105672H
Source title
6th International Conference on Space Optics, ICSO 2006. 27 June 2006 through 30 June 2006
Editor(s)
Costeraste J.
Armandillo, E.
Karafolas, N.
Armandillo, E.
Karafolas, N.