Optical characteristics of supercontinuum generation

Golub, Ilya

doi:10.1364/ol.15.000305

Cited by 87 publications

(49 citation statements)

References 15 publications

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“…Alongside fused silica, in many occasions water serves as a prototypical nonlinear medium for studies of ultrafast light-matter interactions. Systematic studies of the spectral broadening in water date back to the mid-1980s [171] and successfully continue in the femtosecond laser era, see [11,[172][173][174] for the early accounts on femtosecond SC generation in water and some other liquids.…”

Section: Watermentioning

confidence: 99%

Ultrafast supercontinuum generation in bulk condensed media

Dubietis¹,

Tamošauskas²,

Šuminas³

et al. 2017

Lith. J. Phys.

171

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Nonlinear propagation of intense femtosecond laser pulses in bulk transparent media leads to a specific propagation regime, termed femtosecond filamentation, which in turn produces dramatic spectral broadening, or superbroadening, termed supercontinuum generation. Femtosecond supercontinuum generation in transparent solids represents a compact, efficient and alignment-insensitive technique for generation of coherent broadband radiation at various parts of the optical spectrum, which finds numerous applications in diverse fields of modern ultrafast science. During recent years, this research field has reached a high level of maturity, both in understanding of the underlying physics and in achievement of exciting practical results. In this paper we overview the state-of-the-art femtosecond supercontinuum generation in various transparent solid-state media, ranging from wide-bandgap dielectrics to semiconductor materials and in various parts of the optical spectrum, from the ultraviolet to the mid-infrared spectral range. A particular emphasis is given to the most recent experimental developments: multioctave supercontinuum generation with pumping in the mid-infrared spectral range, spectral control, power and energy scaling of broadband radiation and the development of simple, flexible and robust pulse compression techniques, which deliver few optical cycle pulses and which could be readily implemented in a variety of modern ultrafast laser systems.

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Section: Watermentioning

confidence: 99%

Ultrafast supercontinuum generation in bulk condensed media

Dubietis¹,

Tamošauskas²,

Šuminas³

et al. 2017

Lith. J. Phys.

171

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“…The mechanism at the root of conical emission is still debated. It may imply Cerenkov radiation [20,22], self-phase modulation (SPM) [21], four-wave mixing (FWM) [23,24] or X-Waves modelling [25][26][27]. The first experimental measurements of conical emission in air have been performed in the 500-700 nm range [20,21].…”

Section: Introductionmentioning

confidence: 99%

Ultraviolet-visible conical emission by multiple laser filaments

Maioli¹,

Salamé²,

Lascoux³

et al. 2009

Opt. Express

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Abstract:We characterized the angular distribution of the supercontinuum emission from multiple infrared laser filaments propagating in air over long distances, from the infrared (1080 nm) to ultraviolet (225 nm). These experimental data suggest that the X-Waves modeling or Cerenkov emission, rather than phase matching of four-wave mixing, could explain the conical emission. We also estimate the total light conversion efficiency from the original laser wavelength into the white-light continuum. 62-64 (1996). 21. O. G. Kosareva, V. P. Kandidov, A. Brodeur, and S. L. Chin, "Conical emission from laser plasma interactions in the filamentation of powerful ultrashort laser pulses in air," Opt. Lett. 22, 1332Lett. 22, -1334Lett. 22, (1997. 22. I. Golub, "Optical characteristics of supercontinuum generation," Opt. Lett. 15, 305-307 (1990). 23. Q. Xing, K. M. Yoo, and R. R. Alfano, "Conical emission by four-photon parametric generation by using femtosecond laser pulses," Appl. Opt. 32, 2087-2089 (1993). 24. G. G. Luther, A. C. Newell, J. V. Moloney, and E. M. Wright, "Short-pulse conical emission and spectral broadening in normally dispersive media," Opt. Lett. 19, 789-791 (1994 ©2008 Optical Society of America

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“…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].…”

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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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Optical characteristics of supercontinuum generation

Cited by 87 publications

References 15 publications

Ultrafast supercontinuum generation in bulk condensed media

Ultrafast supercontinuum generation in bulk condensed media

Ultraviolet-visible conical emission by multiple laser filaments

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

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