Nonlinear optics of microstructure fibers

Желтиков, А. М.

doi:10.3367/ufnr.0174.200401e.0073

Cited by 44 publications

(10 citation statements)

References 87 publications

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“…This comparison allowed the waveguide CARS enhancement factor to be estimated as approximately 15 for our experimental geometry. This result qualitatively agrees with our expectations based on the 2 l 2 / a 4 scaling law [35] of waveguide CARS enhancement in hollow PCFs ( is the radiation wavelength, l is the nonlinear interaction length, limited by the phase mismatch and radiation losses, and a is the fiber core radius). With the validity of our expectations confirmed by experimental results, we can scale up the results of our measurements to predict waveguide CARS enhancement by two orders of magnitude in hollow-core PCFs with a dispersion profile engineered to increase the CARS coherence length up to l c Ϸ 10 cm.…”

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confidence: 91%

Coherent anti-Stokes Raman scattering in isolated air-guided modes of a hollow-core photonic-crystal fiber

et al. 2004

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Hollow-core photonic-crystal fibers are shown to offer the unique possibility of coherent excitation and probing of Raman-active vibrations in molecules by isolated air-guided modes of electromagnetic radiation. A 3-cm section of a hollow photonic-crystal fiber is used to prepare isolated air-guided modes of pump and probe fields for a coherent excitation of 2331-cm −1 Q-branch vibrations of molecular nitrogen in the gas filling the fiber core, enhancing coherent anti-Stokes Raman scattering through these vibrations by a factor of 15 relative to the regime of tight focusing.Coherent Raman excitations is one of the most important pathways of laser-matter interactions. Coherent Raman processes are at the heart of many efficient spectroscopic [1,2] and microscopic [3] techniques, methods of frequency conversion [4] and time-resolved studies [5,6], as well as lasercooling [7] and quantum-control [8] schemes. Multiple Raman sidebands produced through high-order stimulated Raman scattering allow few-field-cycle pulses to be synthesized [9]. The potential of nonlinear Raman techniques has been recently enhanced by coherent control approaches [10].Many interesting possibilities of coherent Raman processes are associated with waveguide regimes of Raman excitation [11,12]. Hollow fibers [13,14] and Bragg planar waveguides [15] have been shown to improve the efficiency of coherent anti-Stokes Raman scattering (CARS) in the gas phase. Large nonlinear interaction lengths make hollow fibers filled with a Raman-active gas efficient generators of sub-4-fs pulses [9].Air-guided modes in standard hollow fibers are, however, leaky, with the magnitude of losses scaling as 2 / a 3 with the fiber inner radius a and the radiation wavelength [16], which dictates the choice of hollow fibers with a ϳ 50-300 m for nonlinear-optical experiments. Such large-a fibers are essentially multimode, with many guided modes typically contributing to nonlinear-optical interactions [14,17]. This multimode nature of nonlinear-optical processes complicates a precise calibration of the coherent Raman signal as a function of the concentration of Ramanactive species, leads to unwanted interference phenomena in spectroscopic and time-resolved coherant Raman measurements, and should be one of the factors limiting the duration of ultrashort pulses synthesized in hollow fibers.The number of air-guided modes can be radically reduced by using hollow-core photonic-crystal fibers (PCFs) [18,19]. Such fibers guide light due to the high reflectivity of a twodimensionally periodic (photonic-crystal) cladding (the inset in Fig. 1) within photonic band gaps. Low-loss guiding in a few or even a single air-guided mode can be implemented under these conditions in a hollow core with a typical diameter of 10-20 m [18][19][20]. Hollow PCFs with such core diameters have been recently demonstrated to enhance nonlinear-optical processes, including stimulated Raman scattering [21], four-wave mixing (FWM) [22], and selfphase modulation [23]. Air-guided modes in hollow PCFs can sup...

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confidence: 91%

Coherent anti-Stokes Raman scattering in isolated air-guided modes of a hollow-core photonic-crystal fiber

et al. 2004

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“…The microstructure fiber can be designed so, that phase-matching conditions both for the dispersion wave and for the Stokes, anti-Stokes waves will be satisfied on the predefined frequencies. Involve of highorder modes into the process of the frequency conversion allows to expand frequency band for which the phase-matching conditions are satisfied 4,10 . Depending on the waveguide mode excited in the fiber, femtosecond laser pulses can either generate a broadband emission or produce isolated spectral components in the spectrum of output radiation.…”

Section: Introductionmentioning

confidence: 99%

“…The frequency dependence β(ω 0 ), which is responsible for phase match, can be modified by changing of arrangement of air holes in transverse cross section of microstructure fiber (MF). The spectral broadening is possible due to the generation of Stokes and anti-Stokes waves in stimulated Raman Scattering and four-wave mixing processes 2,4 . At large propagation distances stimulated Raman scattering makes possible the generation of the supercontinuum even at the excitation of a fiber by nanosecond pulses with relatively small intensity 2 .…”

Section: Introductionmentioning

confidence: 99%

“…At large propagation distances stimulated Raman scattering makes possible the generation of the supercontinuum even at the excitation of a fiber by nanosecond pulses with relatively small intensity 2 . For effective frequency conversion it is necessary to provide the phase-matching conditions 4,9 . Phase-matching conditions can be satisfied both for a principal mode, and for high-order waveguide modes.…”

Section: Introductionmentioning

confidence: 99%

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Dispersive wave generation by solitons in few-mode microstructure optical fiber

Konyukhov

Melnikov

2005

SPIE Proceedings

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“…The reflectivity of a photoniccrystal cladding can thus substantially exceed the reflectivity of the material of the cladding, considerably reducing radiation losses of waveguide modes even for small-core hollow fibers 11 -13 and providing a unique opportunity for guiding high-intensity laser pulses in the regime of isolated air-guided modes. 11,12 Fibers of this type have been shown to enhance non-linear optical processes radically, 14 including stimulated Raman scattering, 15 four-wave mixing 16 and self-phase modulation. 17 The spatial self-action of intense ultrashort laser pulses gives rise to interesting waveguiding S. O. Konorov et al regimes in hollow PCFs below the blowup threshold.…”

Section: Introductionmentioning

confidence: 99%

Phase‐matched coherent anti‐Stokes Raman scattering in isolated air‐guided modes of hollow photonic‐crystal fibers

Konorov

Федотов

Serebryannikov

et al. 2005

J Raman Spectroscopy

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Hollow-core photonic-crystal fibers with a specially designed dispersion profile offer unique phasematching solutions for gas-phase coherent anti-Stokes Raman scattering (CARS) in isolated guided modes with a transverse radius of only a few micrometers. Efficient single-mode CARS tuned to a Raman resonance with 2331 cm −1 Q-branch vibrations of molecular nitrogen filling the hollow core of the photonic crystal fiber is demonstrated using the second-harmonic output of a Q-switched Nd:YAG laser and wavelength-tunable dye-laser radiation as pump fields.

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Nonlinear optics of microstructure fibers

Cited by 44 publications

References 87 publications

Coherent anti-Stokes Raman scattering in isolated air-guided modes of a hollow-core photonic-crystal fiber

Coherent anti-Stokes Raman scattering in isolated air-guided modes of a hollow-core photonic-crystal fiber

Dispersive wave generation by solitons in few-mode microstructure optical fiber

Phase‐matched coherent anti‐Stokes Raman scattering in isolated air‐guided modes of hollow photonic‐crystal fibers

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