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Broadband supercontinuum generation mediated by non-adiabatic mode dispersion profiles resulting in new type of soliton dynamics in dispersion-designed antiresonant hollow-core fibers is reported. A new concept of soliton explosion is demonstrated in experiment and simulation.
Antiresonant hollow core fibers (ARHCF) have low propagation loss, broad transparency windows from ultraviolet to mid-infrared regime in fundamental mode propagation and can be easily fabricated [1, 2]. In these fibers, geometrically-induced strand resonances are given by λm = 2t√n2 −1/m, where t is the strand thickness, n is the refractive index of the material and m is the integer resonance. The...
Coherent diffractive imaging (CDI) is a lensless microscopy technique where a sample is imaged by recording the far field intensity diffraction pattern and subsequently retrieving the phase by iterative computer algorithms. It nowadays enables imaging with few-nanometers resolution by employing X-ray radiation usually provided either by synchrotron or free-electron laser facilities [1]. During the...
Group velocity dispersion (GVD) plays a significant role in ultra-short pulse propagation in a fiber. Advent of photonic crystal fibers made it possible to tune the fiber dispersion properties and fabricate the fibers with one or two zero dispersion wavelengths (ZDW). This work describes the successful dispersion measurement of fundamental mode in the novel antiresonant hollow core fiber (ARHCF) [1,...
We report on octave broadband supercontinuum generation from ultraviolet to near infrared wavelengths in the fundamental mode of a gas-filled novel low-loss anti-resonant hollow-core fiber having distinct transmission windows.
Extreme ultraviolet (XUV) transient absorption at the germanium M4,5-edge simultaneously measures electron and hole dynamics over 1.5 ps with few-femtosecond resolution. In the analysis, time-dependent density functional theory (TD-DFT) will be compared with experimental data.
We present a compact interferometric autocorrelator that allows the characterization of ultrashort laser pulses in the visible light domain (370–740nm). The presented device uses a GaN photodiode with corresponding two-photon absorption. Different GaN and AlGaN photodiodes were characterized for this purpose. Despite AlGaN diodes have a better matched bandgap for this application, we have found that...
Optical microscopy has been a driving motor in science for several centuries. One main principle in microscopy is that the smallest resolvable detail in a microscopic image is limited to half the wavelength of the light illuminating the object. To overcome this limitation, the object should be illuminated with shorter wavelengths in the extreme ultra violet (XUV). The main problem in the XUV is the...
Light beams carrying an isolated point singularity with a screw-type phase distribution are called an optical vortex (OV) (Fig 1). The fact that in free space the Poynting vector of the beam gives the momentum flow leads to an orbital angular momentum (OAM) of the photons in such a singular beam, independent on the spin angular momentum [1]. There are many applications of optical OAM shown in literature...
The combination of high-field physics with nano-plasmonics has proven to be feasible in producing high harmonics of intense laser radiation from noble gases, assisted by the field-enhancement effect in the proximity of metallic nano-antennas. However, the intensity region where harmonics can be generated without irreversible damage to these delicate structures is rather narrow. We explore the damage...
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