Infrared extension of femtosecond supercontinuum generated by filamentation in solid-state media

Jukna, Vytautas; Galinis, Justinas; Tamošauskas, G.; Majus, D.; Dubietis, A.

doi:10.1007/s00340-013-5723-8

Cited by 50 publications

(29 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, experiments show that the loose focusing condition facilitates the enhanced red-shifted broadening of the SC spectrum [26], stemming from the increased nonlinear propagation of the leading sub-pulse, which preserves a steep ascending front [133].…”

Section: Practical Considerationsmentioning

confidence: 99%

“…On the other hand, enhancement of the red-shifted SC spectral extent was achieved by setting a low numerical aperture of the input beam and using a longer nonlinear medium [26,133]. A notable extension of the SC spectrum and enhancement of the SC components within certain spectral ranges, in particular, was achieved by means of two colour filamentation, i.e.…”

Section: Control Of Supercontinuum Generationmentioning

confidence: 99%

See 1 more Smart Citation

Ultrafast supercontinuum generation in bulk condensed media

Dubietis¹,

Tamošauskas²,

Šuminas³

et al. 2017

Lith. J. Phys.

167

View full text Add to dashboard Cite

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.

show abstract

Section: Practical Considerationsmentioning

confidence: 99%

Section: Control Of Supercontinuum Generationmentioning

confidence: 99%

Ultrafast supercontinuum generation in bulk condensed media

Dubietis¹,

Tamošauskas²,

Šuminas³

et al. 2017

Lith. J. Phys.

167

View full text Add to dashboard Cite

show abstract

“…These discrete damage traces are attributed to the beating between the Bessel beam and the axial radiation. Regular focusing-refocusing events of similar nature were observed in [9] in barium fluoride crystal in the filaments, excited by axicon-formed femtosecond Bessel pulses.Several papers examined femtosecond filamentation in solid birefringent media, which are of great interest as structural materials for femtosecond lasers (see, e.g., [10][11][12][13][14][15]). A simplified case of the filament excitation only by ordinary or extraordinary ray was addressed in most of these studies.…”

mentioning

confidence: 99%

“…Several papers examined femtosecond filamentation in solid birefringent media, which are of great interest as structural materials for femtosecond lasers (see, e.g., [10][11][12][13][14][15]). A simplified case of the filament excitation only by ordinary or extraordinary ray was addressed in most of these studies.…”

mentioning

confidence: 99%

Periodic femtosecond filamentation in birefringent media

et al. 2015

View full text Add to dashboard Cite

phenomenon of multiple refocusing [5]. Up to three peaks of on-axis luminescence intensity were observed when the authors of [6] focused a femtosecond laser pulse into an isotropic fused silica sample with a high-NA objective. Multiple irregular refocusing of tightly focused femtosecond laser pulse, with the distance between the refocusing maxima varying from 20 to 40 μm, was observed inside fused silica in [7]. The phenomenon was associated with the focal spot extension along the propagation axis due to the spherical aberration, induced by the air-sample interface. It was shown in [8] that filaments generated by pulsed Bessel beams form discrete equidistant damage spots in borosilicate glass. These discrete damage traces are attributed to the beating between the Bessel beam and the axial radiation. Regular focusing-refocusing events of similar nature were observed in [9] in barium fluoride crystal in the filaments, excited by axicon-formed femtosecond Bessel pulses.Several papers examined femtosecond filamentation in solid birefringent media, which are of great interest as structural materials for femtosecond lasers (see, e.g., [10][11][12][13][14][15]). A simplified case of the filament excitation only by ordinary or extraordinary ray was addressed in most of these studies.In this paper, we report on the observation of longitudinally periodic filamentation of femtosecond laser radiation in positive (n o < n e ; crystalline quartz) and negative (n o > n e ; sapphire) birefringent crystalline media in loose focusing conditions (NA = 0.02). We focus on little studied and unattainable in isotropic material peculiarities of the filamentation process, which are caused by spatial and temporal overlap of ordinary (o) and extraordinary (e) pulses inside the crystal. It is in this case the specificity of femtosecond filamentation in birefringent medium is shown in full. AbstractWe report on the experimental observation of periodic modulation of the axial luminescence intensity along the femtosecond filament track in sapphire and crystal quartz. The physical reason for the modulation is a cyclic transformation of the polarization state of the light pulse traveling in birefringent medium, caused by the phase raid between the ordinary and extraordinary rays, and different cross sections of multiphoton absorption for linear and circular polarizations.

show abstract

“…Earlier, the structure of filaments, conditions of their formation, and SC and CE properties were mainly considered for isotropic Kerr media [1][2][3]. The number of researches concerning femtosecond filaments in birefringent media is rather small [4][5][6][7][8][9][10]. However, the knowledge of the processes of formation and the properties of filaments at the propagation of ultrashort light pulses in such media -in particular, in sapphire -is of importance, since this material is used as an active medium in modern laser systems.…”

Section: Introductionmentioning

confidence: 99%

“White Supercontinuum” and “Conical Emission” of Femtosecond Filaments in Birefringent Media

et al. 2016

View full text Add to dashboard Cite

The observation of the polarization features of the "white supercontinuum" type and the "conical emission" of femtosecond laser filaments in quartz and sapphire is reported. The features are caused by the positive and negative birefringences of quartz and sapphire. The polarization directions of "white supercontinuum" and "conical emission" are mutually normal as a result of the difference between the group velocities of the ordinary and extraordinary rays. A physical mechanism of conical emission, which explains the features of its polarization, has been proposed.

show abstract

Infrared extension of femtosecond supercontinuum generated by filamentation in solid-state media

Cited by 50 publications

References 36 publications

Ultrafast supercontinuum generation in bulk condensed media

Ultrafast supercontinuum generation in bulk condensed media

Periodic femtosecond filamentation in birefringent media

“White Supercontinuum” and “Conical Emission” of Femtosecond Filaments in Birefringent Media

Contact Info

Product

Resources

About