Stimulated Raman Scattering in Hydrogen-Filled Hollow-Core Photonic Crystal Fiber

We report on stimulated Raman scattering in an approximately 1-meter-long hollow-core photonic crystal fiber filled with hydrogen gas under pressure. Light was guided and confined in the 15-micrometer-diameter hollow core by a two-dimensional photonic bandgap. Using a pulsed laser source (pulse dura...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2002-10, Vol.298 (5592), p.399-402
Main Authors: Benabid, F., Knight, J. C., Antonopoulos, G., P. St. J. Russell
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fiber optics
Four wave mixing
Fundamental areas of phenomenology (including applications)
Gases
Hydrogen
Laser beams
Laser power
Lasers
Nonlinear optics
Optical materials
Optics
Photonic bandgap materials
Photonics
Physics
Pumps
Signals
Stimulated raman scattering
cars
Wavelengths
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Summary:We report on stimulated Raman scattering in an approximately 1-meter-long hollow-core photonic crystal fiber filled with hydrogen gas under pressure. Light was guided and confined in the 15-micrometer-diameter hollow core by a two-dimensional photonic bandgap. Using a pulsed laser source (pulse duration, 6 nanoseconds; wavelength, 532 nanometers), the threshold for Stokes (longer wavelength) generation was observed at pulse energies as low as 800 ± 200 nanojoules, followed by a coherent anti-Stokes (shorter wavelength) generation threshold at 3.4 ± 0.7 microjoules. The pump-to-Stokes conversion efficiency was 30 ± 3% at a pulse energy of only 4.5 microjoules. These energies are almost two orders of magnitude lower than any other reported energy, moving gas-based nonlinear optics to previously inaccessible parameter regimes of high intensity and long interaction length.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.1076408