ORCID Profile
0000-0002-5297-8321
Current Organisation
University of Southampton
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Publisher: Optica Publishing Group
Date: 25-10-2021
DOI: 10.1364/JOSAB.439330
Abstract: The physics and applications of fiber-based supercontinuum (SC) sources have been a subject of intense interest over the last decade, with significant impact on both basic science and industry. New uses for SC sources are also constantly emerging due to their unique properties that combine high brightness, multi-octave frequency bandwidth, fiber delivery, and single-mode output. The last few years have seen significant research efforts focused on extending the wavelength coverage of SC sources towards the 2 to 20 µ m molecular fingerprint mid-infrared (MIR) region and in the ultraviolet (UV) down to 100 nm, while also improving stability, noise and coherence, output power, and polarization properties. Here we review a selection of recent advances in SC generation in a range of specialty optical fibers, including fluoride, chalcogenide, telluride, and silicon-core fibers for the MIR UV-grade silica fibers and gas-filled hollow-core fibers for the UV range and all-normal dispersion fibers for ultralow-noise coherent SC generation.
Publisher: The Optical Society
Date: 08-11-2019
DOI: 10.1364/OL.44.005505
Publisher: Optica Publishing Group
Date: 09-05-2022
DOI: 10.1364/OL.455571
Abstract: Intensity fluctuations in supercontinuum generation are studied in polarization-maintaining (PM) and non-PM all-normal dispersion tellurite photonic crystal fibers. Dispersive Fourier transformation is used to resolve the shot-to-shot spectra generated using 225-fs pump pulses at 1.55 μ m, with experimental results well reproduced by vector and scalar numerical simulations. By comparing the relative intensity noise for the PM and non-PM cases, supported by simulations, we demonstrate the advantage of the polarization-maintaining property of the PM fibers in preserving low-noise dynamics. We associate the low-noise in the PM case with the suppression of polarization modulation instability.
Publisher: Optica Publishing Group
Date: 24-06-2020
DOI: 10.1364/OL.397106
Abstract: We demonstrate broadband supercontinuum generation in an all-normal dispersion polarization-maintaining photonic crystal fiber and report the observation of a cross-phase modulation instability sideband generated outside of the supercontinuum bandwidth. We demonstrate that this sideband is polarized on the slow axis and can be suppressed by pumping on the fiber’s fast axis. We theoretically confirm and model this nonlinear process using phase-matching conditions and numerical simulations, obtaining good agreement with the measured data.
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for AMAR NATH GHOSH.