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Bessel beam
About: Bessel beam is a research topic. Over the lifetime, 1946 publications have been published within this topic receiving 42264 citations.
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TL;DR: In this paper, the authors employed the technique of holographic intensity amplification to enhance the conversion from a Gaussian beam to a Bessel beam with conversion efficiency approaching 50% and extended the maximum propagation distance.
Abstract: The generation of a diffraction‐free Bessel beam from a beam that is originally Gaussian is accompanied by substantial power loss. We employed the technique of holographic intensity amplification to enhance the conversion from a Gaussian beam to a Bessel beam with conversion efficiency approaching 50%. In addition the maximum propagation distance was extended.
3 citations
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TL;DR: In this paper, a co-axial pump (optical)-probe (X-rays) experimental concept and show performance of the optical component are presented. But the performance of optical pump is limited to the case of femtosecond X-ray free electron laser (FEL).
Abstract: We put forward a co-axial pump(optical)-probe(X-rays) experimental concept and show performance of the optical component. A Bessel beam generator with a central 100 micrometers-diameter hole (on the optical axis) was fabricated using femtosecond (fs) laser structuring inside a silica plate. This flat-axicon optical element produces a needle-like axial intensity distribution which can be used for the optical pump pulse. The fs-X-ray free electron laser (X-FEL) beam of sub-1 micrometer diameter can be introduced through the central hole along the optical axis onto a target as a probe. Different realisations of optical pump are discussed. Such optical elements facilitate alignment of ultra-short fs-pulses in space and time and can be used in light-matter interaction experiments at extreme energy densities on the surface and in the volume of targets. Full advantage of ultra-short 10 fs X-FEL probe pulses with fs-pump(optical) opens an unexplored temporal dimension of phase transitions and the fastest laser-induced rates of material heating and quenching. A wider field of applications of fs-laser-enabled structuring of materials and design of specific optical elements for astrophotonics is presented.
3 citations
07 Aug 2006
TL;DR: In this article, the self-reconstruction of Bessel beam after shadowing with single obstacle is studied using conical beams, and the peculiarities of speckle contrast imaging of subsurface targets embedded into highly scattering media have been investigated.
Abstract: The detailed theoretical and experimental investigations of the self-reconstruction of the structure of Bessel beams in various scattering media, including biological tissue, have been carried out Also the self- reconstruction of Bessel beam after shadowing with single obstacle is studied Using conical beams, the peculiarities of speckle contrast imaging of subsurface targets embedded into highly scattering media have been investigated
3 citations
TL;DR: The efficient generation of redshifted pulses from chirped femtosecond joule level Bessel beam pulses in gases is studied, which have an almost perfect Gaussian beam profile insensitive of the pump beam profile, and are much shorter than the pump pulses.
Abstract: The efficient generation of redshifted pulses from chirped femtosecond joule level Bessel beam pulses in gases is studied. The redshift spans from a few 100 cm−1 to several 1000 cm−1 corresponding to a shift of 50-500 nm for Nd:glass laser systems. The generated pulses have an almost perfect Gaussian beam profile insensitive of the pump beam profile, and are much shorter than the pump pulses. The highest measured energy is as high as 30 mJ, which is significantly higher than possible with solid state nonlinear frequency shifters.
3 citations
TL;DR: In this article, the propagation property of Laguerre-Gaussian (LG) beams passing through a diffractive ring-lens (RL) was studied, where the RL was generated by a liquid crystal spatial light modulator (LC-SLM).
Abstract: The propagation property of Laguerre-Gaussian (LG) beams passing through a diffractive ring-lens (RL) was studied, where the RL was generated by a liquid crystal spatial light modulator (LC-SLM). It was found that the LG beam was transformed into a sharp ring at the focal plane first, and then a Bessel-similar beam was formed behind the focal plane but the beam size was enlarged with the increase of propagation distance. With the help of a group of lenses, the beam was further collimated into a Bessel beam. Finally, the “non-diffractive” and selfreconstruction properties of the generated Bessel beams were experimentally verified.
3 citations