Energetic mid-IR femtosecond pulse generation by self-defocusing soliton-induced dispersive waves in a bulk quadratic nonlinear crystal

Zhou, Binbin; Guo, Hairun; Bache, Morten

doi:10.1364/oe.23.006924

Cited by 27 publications

(28 citation statements)

References 43 publications

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“…For example, consider harmonic generation, sum frequency generation, and self-defocusing soliton-induced dispersive waves in crystals [30][31][32][33][34], or intermodal four wave mixing (FWM) in optical fibers [35,36], including the case of GRIN fibers [37]. Although many FWM effects can be phase matched in a multimode propagation, none of them have shown the direct generation of a sequence of bright sidebands combined with such large frequency shifts from the pump.…”

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confidence: 99%

Observation of Geometric Parametric Instability Induced by the Periodic Spatial Self-Imaging of Multimode Waves

et al. 2016

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Spatiotemporal mode coupling in highly multimode physical systems permits new routes for exploring complex instabilities and forming coherent wave structures. We present here the first experimental demonstration of multiple geometric parametric instability sidebands, generated in the frequency domain through resonant space-time coupling, owing to the natural periodic spatial self-imaging of a multimode quasi-continuous-wave beam in a standard graded-index multimode fiber. The input beam was launched in the fiber by means of an amplified microchip laser emitting sub-ns pulses at 1064 nm. The experimentally observed frequency spacing among sidebands agrees well with analytical predictions and numerical simulations. The first-order peaks are located at the considerably large detuning of 123.5 THz from the pump. These results open the remarkable possibility to convert a near-infrared laser directly into a broad spectral range spanning visible and infrared wavelengths, by means of a single resonant parametric nonlinear effect occurring in the normal dispersion regime. As further evidence of our strong space-time coupling regime, we observed the striking effect that all of the different sideband peaks were carried by a well-defined and stable bell-shaped spatial profile.

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confidence: 99%

Observation of Geometric Parametric Instability Induced by the Periodic Spatial Self-Imaging of Multimode Waves

et al. 2016

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“…However, despite the success of exciting selfdefocusing temporal soliton in the BBO crystal, and the numerical prediction of the existence of such a DW emission [17], the formation of DW emission in the anomalous GVD regime of this crystal has so far never been observed experimentally. It was only recently observed directly for the first time in cascaded nonlinear media [18]: The strong few-cycle near-IR self-defocusing soliton self-compression observed in a bulk lithium niobate crystal in [16] was confirmed to give rise to a resonant transfer of energy to a femtosecond mid-IR dispersive wave [18].…”

Section: Ocis Codesmentioning

confidence: 95%

“…The generated DWs are tunable by the angle-tuning of phase mismatch or pump intensity. Such technique can be easily applied to other bulk quadratic crystals and enable DW generation in different wavelength ranges [18,19].…”

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confidence: 99%

Dispersive waves induced by self-defocusing temporal solitons in a beta-barium-borate crystal

Zhou

Bache

2015

Opt. Lett.

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We experimentally observe long-wavelength dispersive waves generation in a BBO crystal. A soliton was formed in normal GVD regime of the crystal by a self-defocusing and negative nonlinearity through phase-mismatched quatradic interaction. Strong temporal pulse compression confirmed the formation of soliton during the pulse propagation inside the crystal. Significant dispersive wave radiation was measured in the anomalous GVD regime of the BBO crystal. With the pump wavelengths from 1.24 to 1.4 µm, tunable dispersive waves are generated around 1.9 to 2.2 µm. The observed dispersive wave generation is well understood by simulations. OCIS codes:(320. Fiber-based dispersive wave (DW) induced by solitons has been intensively investigated. It plays an essential role in fiber supercontiuum generation [1,2]. New spectral components on either the short-wavelength side or the long-wavelength side of the pump wavelength are possible by this technique with proper fiber dispersion control [3][4][5][6][7][8]. The normally small core size of the fiber, however, limits the propagating pulse energy; especially when generating DW in the long-wavelength side of the pump and multiple zero-dispersion wavelengths (ZDWs) are needed. The direct use of bulk nonlinear materials is promising for high pump energy. Most bulk nonlinear materials have normal group velocity dispersion (GVD) in the near-infrared (NIR) pump wavelength; therefore, when a conventional Kerr (self-focusing and positive) nonlinearity is employed, the study of DW generation easily falls into another dilemma: filamentation likely kicks in. Which complicates the whole process, and greatly impedes its application [9][10][11].A negative (self-defocusing) nonlinearity, e.g. the one available from a phase-mismatched quadratic process, could open a new window for DW research for the mostly used NIR pump wavelengths. The flipped sign of nonlinearity means that instead of filamentations, the generation of soliton is possible in the normal GVD regime of the bulk material in the NIR; which will then be able to stimulate efficient DW emission in the anomalous GVD regime (longer wavelength) of the crystal. Furthermore, much higher pulse energy could be supported due to * moba@fotonik.dtu.dk the absence of filamentation. The excitation and utilization of NIR soliton in the normal GVD regime by the phase-mismatched quadratic process have been reported in various nonlinear crystals [12][13][14][15][16]; especially in the most frequently used BBO crystal, by which soliton compression down to few optical cycle has been realized [14]. However, despite the success of exciting selfdefocusing temporal soliton in the BBO crystal, and the numerical prediction of the existence of such a DW emission [17], the formation of DW emission in the anomalous GVD regime of this crystal has so far never been observed experimentally. It was only recently observed directly for the first time in cascaded nonlinear media [18]: The strong few-cycle near-IR self-defocusing soliton self-compression observed i...

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“…The majority of current ultrafast mid-IR lasers are, however, based on cumbersome parametric systems [13], quadratic nonlinear crystals with defocusing nonlinearity [14] or high-energy two-color schemes [15]. Any approach that would permit the design of a compact alternative, such as a fiber-based device, would be of great importance.…”

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confidence: 99%

Photoionization-Induced Emission of Tunable Few-Cycle Midinfrared Dispersive Waves in Gas-Filled Hollow-Core Photonic Crystal Fibers

et al. 2015

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We propose a scheme for the emission of few-cycle dispersive waves in the mid-infrared using hollow-core photonic crystal fibers filled with noble gas. The underlying mechanism is the formation of a plasma cloud by a self-compressed, sub-cycle pump pulse. The resulting free-electron population modifies the fiber dispersion, allowing phase-matched access to dispersive waves at otherwise inaccessible frequencies, well into the mid-IR. Remarkably, the pulses generated turn out to have durations of the order of two optical cycles. In addition, this ultrafast emission, which occurs even in the absence of a zero dispersion point between pump and mid-IR wavelengths, is tunable over a wide frequency range simply by adjusting the gas pressure. These theoretical results pave the way to a new generation of compact, fiber-based sources of few-cycle mid-IR radiation.

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Energetic mid-IR femtosecond pulse generation by self-defocusing soliton-induced dispersive waves in a bulk quadratic nonlinear crystal

Cited by 27 publications

References 43 publications

Observation of Geometric Parametric Instability Induced by the Periodic Spatial Self-Imaging of Multimode Waves

Observation of Geometric Parametric Instability Induced by the Periodic Spatial Self-Imaging of Multimode Waves

Dispersive waves induced by self-defocusing temporal solitons in a beta-barium-borate crystal

Photoionization-Induced Emission of Tunable Few-Cycle Midinfrared Dispersive Waves in Gas-Filled Hollow-Core Photonic Crystal Fibers

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