Nonlinear polarization dynamics in a weakly birefringent all-normal dispersion photonic crystal fiber: toward a practical coherent fiber supercontinuum laser
TLDR
It is found that an intrinsic form-birefringence on the order of 10−5 profoundly affects the SC generation in a DFDD-ANDi photonic crystal fiber, and the fabrication of polarization-maintaining DFDD -ANDi fibers is proposed to avoid these adverse effects in pursuing a practical coherent fiber SC laser.Abstract:
Dispersion-flattened dispersion-decreased all-normal dispersion (DFDD-ANDi) photonic crystal fibers have been identified as promising candidates for high-spectral-power coherent supercontinuum (SC) generation. However, the effects of the unintentional birefringence of the fibers on the SC generation have been ignored. This birefringence is widely present in nonlinear non-polarization maintaining fibers with a typical core size of 2 µm, presumably due to the structural symmetry breaks introduced in the fiber drawing process. We find that an intrinsic form-birefringence on the order of 10−5 profoundly affects the SC generation in a DFDD-ANDi photonic crystal fiber. Conventional simulations based on the scalar generalized nonlinear Schrodinger equation (GNLSE) fail to reproduce the prominent observed features of the SC generation in a short piece (9-cm) of this fiber. However, these features can be qualitatively or semi-quantitatively understood by the coupled GNLSE that takes into account the form-birefringence. The nonlinear polarization effects induced by the birefringence significantly distort the otherwise simple spectrotemporal field of the SC pulses. We therefore propose the fabrication of polarization-maintaining DFDD-ANDi fibers to avoid these adverse effects in pursuing a practical coherent fiber SC laser.read more
Citations
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Supercontinuum generation, photonic crystal fiber
TL;DR: In this article, a review of numerical and experimental studies of supercontinuum generation in photonic crystal fiber is presented over the full range of experimentally reported parameters, from the femtosecond to the continuous-wave regime.
Journal ArticleDOI
Stain-free histopathology by programmable supercontinuum pulses
Haohua Tu,Yuan Liu,Dmitry Turchinovich,Marina Marjanovic,Jens K. Lyngsø,Jesper Lægsgaard,Eric J. Chaney,Youbo Zhao,Sixian You,William L. Wilson,Bingwei Xu,Marcos Dantus,Stephen A. Boppart +12 more
TL;DR: A unique optical imaging platform and methodology for label-free multimodal multiphoton microscopy that uses a novel photonic crystal fiber source to generate tailored chemical contrast based on programmable supercontinuum pulses is introduced.
Journal ArticleDOI
Coherent fiber supercontinuum for biophotonics.
Haohua Tu,Stephen A. Boppart +1 more
TL;DR: Nonlinear fiber optics and femtosecond laser development are the focus of this review, because they can be integrated into a low-cost portable biophotonics source platform, enabling new applications such as point-of-care coherent optical biomedical imaging.
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Limits of coherent supercontinuum generation in normal dispersion fibers
TL;DR: In this article, the authors studied the transition between coherent and noise-seeded incoherent continuum generation in all-normal dispersion (ANDi) fibers and showed that highly coherent supercontinua with spectral bandwidths of one octave can be generated with long pump pulses of up to 1.5 ps duration.
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Polarization noise places severe constraints on coherence of all-normal dispersion femtosecond supercontinuum generation.
TL;DR: It is demonstrated that the PMI introduces a power dependence not found in a scalar model, which means that even with short ~120 fs pump pulses the coherence of ANDi SC can be degraded at reasonable power levels above ~40 kW.
References
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