Dr. Shigeru Suzuki Profile

Dr. Shigeru Suzuki

at IMRA America Inc

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PROCEEDINGS ARTICLE | February 11, 2011

Advanced specialty fiber designs for fiber lasers

Proc. SPIE. 7914, Fiber Lasers VIII: Technology, Systems, and Applications

KEYWORDS: Optical fibers, Silica, Waveguides, Cladding, Glasses, Fiber lasers, Photonics, Neodymium, Acoustics, Absorption

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Progress in advanced specialty fibers is the foundation to further breakthroughs in fiber lasers. Recently, we have been working to advance several areas of developments in specialty fibers and would like to review these efforts here. The first topic is in the further development of all-glass large core leakage channel fibers (LCF) for robust and practical solutions for power scaling. The second area is the development of wide band air-core fibers with an innovative square lattice cladding and the demonstration of a factor of two improvements in bandgap over conventional hexagonal lattice. These air-core fibers are critical for fiber delivery solution of both CW and pulsed fiber lasers in the future. The last topic is a new development in design and simulation of SBS gains in optical fibers by incorporating leaky acoustic modes. These leaky acoustic modes have been mostly overlooked so far. It is essential that they are considered in SBS simulations in fibers, because they are normal solutions to the acoustic waveguide equations and have similar loss to guided acoustic modes where the acoustic mode loss is dominated by material loss. This leads to much improved resolution of SBS gain spectrum in fibers and to new design insights to the limit of SBS suppression based on anti-guide acoustic waveguide designs.

PROCEEDINGS ARTICLE | October 14, 2010

Extending bandgap of air-core photonic bandgap fibers

Proc. SPIE. 7839, 2nd Workshop on Specialty Optical Fibers and Their Applications (WSOF-2)

KEYWORDS: Optical fibers, Refractive index, Photonic crystal fibers, Waveguides, Cladding, Capillaries, Spectroscopy, Raman spectroscopy, Nonlinear optics, Spectroscopes

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Air-core photonic bandgap fibers offer many unique properties and are critical to many emerging applications. A notable property is the high nonlinear threshold which is the key for applications at high peak powers. The strong interaction of light and air is also essential for a number of emerging applications, especially those based on nonlinear interactions and spectroscopy. For many of those applications, much wider transmission bandwidths are desired to accommodate a wider tuning range or a large number of optical wavelengths involved. All demonstrated air-core photonic bandgap fibers so far have a cladding of hexagonal lattice. The densely packed geometry of hexagonal stacking does not allow large nodes in the cladding, which are essential for a further increase of photonic bandgaps. On the other hand, a photonic cladding with a square lattice can potentially provide much larger nodes and consequently wider bandgap. In this work, the potentials of much wider bandgap with square lattice cladding are theoretically studied.

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