White-light generation using spatially-structured beams of femtosecond radiation

Kaya, Necati; Strohaber, James; Kolomenskii, A.A.; Kaya, Gamze; Schroeder, Hartmut; Schuessler, H. A.

doi:10.1364/oe.20.013337

Cited by 19 publications

(9 citation statements)

References 33 publications

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“…[35][36][37] Indeed, hot spots in the central part of the beam corresponding to filament formation were directly observed in our experiments, while the radial lobes had intensities too low to produce a filament as seen in the image of the inset of Fig. 1.…”

Section: Experimental Details Results and Discussionsupporting

confidence: 58%

Extension of filament propagation in water with Bessel-Gaussian beams

Kaya

Sayrac

et al. 2016

AIP Advances

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We experimentally studied intense femtosecond pulse filamentation and propagation in water for Bessel-Gaussian beams with different numbers of radial modal lobes. The transverse modes of the incident Bessel-Gaussian beam were created from a Gaussian beam of a Ti:sapphire laser system by using computer generated hologram techniques. We found that filament propagation length increased with increasing number of lobes under the conditions of the same peak intensity, pulse duration, and the size of the central peak of the incident beam, suggesting that the radial modal lobes may serve as an energy reservoir for the filaments formed by the central intensity peak.

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Section: Experimental Details Results and Discussionsupporting

confidence: 58%

Extension of filament propagation in water with Bessel-Gaussian beams

Kaya

Sayrac

et al. 2016

AIP Advances

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“…Figure 20(b) shows an example how the spectral intensity within certain spectral regions and the overall shape of the resulting SC spectrum is modified by varying the time delay between the co-filamenting fundamental and second harmonic pulses. An efficient control of the SC spectrum was also performed by changing the relative position of the focus in the nonlinear medium by means of diffractive optics [264,265] or by varying the spatial phase of the input beam with spatial light modulators [266,267]. Fine adjustment of the position of the nonlinear focus was demonstrated by varying the carrier envelope phase of a few-cycle input pulse [268].…”

Section: Control Of Supercontinuum Generationmentioning

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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“…This study emphasized the focal position of the incident laser light within the medium and the pulse duration of the incident laser beam. Later, white-light generation with phase discontinuities and steeper intensity gradients was achieved with a 1-D spatial light modulator [42]. In 2016, the output supercontinuum spectra were extended to 2000 nm, by choosing a pump wavelength at 1860 nm [43].…”

Section: Supercontinuum Generation From Watermentioning

confidence: 99%