Large mode area fibers are imperative for scaling up the peak and average power of fiber lasers. Single-mode behavior
and low FM loss are the crucial functionalities for these fibers. While rod-type Photonic Crystal Fibers (PCFs) have
been very successful in offering large mode areas, the typical device length requirement (~1m) and rigid configuration
limits their attractiveness for practical applications. LMA fibers offering a degree of bend tolerance are thus highly
desired. Leakage channel fibers (LCFs) have shown a great potential for offering substantial bend tolerance along with
large mode areas. However, the proposed use of Fluorine-doped rods in the all-solid version limits their practical design space. Here, we propose a novel design concept to attain single-material, large mode area fibers (mode area >~1000μm2) with effectively single mode operation coupled with bending characteristics comparable to all-solid LCFs and, at the same time, greater design flexibility and easier splicing relative to rod-type PCFs.
Astrophotonics offers a solution to some of the problems of building instruments for the next generation of telescopes
through the use of photonic devices to miniaturise and simplify instruments. It has already proved its worth in
interferometry over the last decade and is now being applied to nightsky background suppression. Astrophotonics offers
a radically different approach to highly-multiplexed spectroscopy to the benefit of galaxy surveys such as are required to
determine the evolution of the cosmic equation of state. The Astrophotonica Europa partnership funded by the EU via
OPTICON is undertaking a wide-ranging survey of the technological opportunities and their applicability to high-priority
astrophysical goals of the next generation of observatories. Here we summarise some of the conclusions.
We report recent advances in the development of fibers for the delivery and generation of both single-mode and heavily
multimode laser beams as well as recent progress in fibers for supercontinuum generation in spectral regimes spanning
the visible to mid-IR.
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