Highly germanium and lanthanum modified silica based glasses in microstructured optical fibers for non-linear applications
✍ Scribed by Jens Kobelke; Kay Schuster; Doris Litzkendorf; Anka Schwuchow; Johannes Kirchhof; Vincent Tombelaine; Hartmut Bartelt; Philippe Leproux; Vincent Couderc; Alexis Labruyere; Raphael Jamier
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 287 KB
- Volume
- 32
- Category
- Article
- ISSN
- 0925-3467
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✦ Synopsis
Modified core glass materials in silica-clad microstructured fibers (MOFs) promise efficient conversion of non-linear processes, e.g. for supercontinuum (SC) generation. We used extremely highly germaniumdoped silica (max. 36 mol% GeO 2 ) and lanthanum aluminum silicate glasses with high lanthanum oxide concentration (max. 10 mol% La 2 O 3 ) as core materials. The microstructured optical fibers (Ge-MOFs, La-MOFs) were prepared in five air ring architecture by a stack-and-draw technique using silica for the cladding region. The MOFs show loss minima of about 0.05 dB m À1 (Ge-MOF) and 1.3 dB m À1 (La-MOF) at a wavelength of 1.064 lm. Such Ge-MOFs and La-MOFs are compatible with conventional silica fibers giving low loss splices with standard single mode fibers. The non-linearity of the La-MOF is approximately two times higher than that of the Ge-MOF, but shows a significantly higher spectral loss. Ge-MOF and La-MOF can both produce similar ultra-broad band supercontinuum spectra from VIS (540 nm and 500 nm) to IR range (2400 nm and 2220 nm) by being pumped with a passively Q-switched Nd:YAG microchip laser.