Low value of the beam width parameter in the focal region due to nonlinear dielectric role of relativistic plasma with exponential density transition is observed. Helmut seidl, reinhard wilhelmdate released publisher. Past and present is of interest to scientists and engineers working with lasers and their applications, as well as students, researchers, and laser and eye surgeons topics. Selffocusing and filamentation of femtosecond pulses.
Selffocusing has been an area of active scientific investigation for nearly 50 years. It connects the extensive early literature on selffocusing, filamentation, selftrapping, and collapse with more recent studies aimed at issues such as selffocusing of femtosecond pulses, white light generation, and the generation. Selected publications and presentations university of rochester. Relativistic gaussian laser beam selffocusing in collisional. Wise school of applied and engineering physics, cornell university, ithaca, new york 14853 and. Pdf the nonlinear index of refraction is responsible for selfaction effects in optical. Fundamentals and prospects topics in applied physics series by robert w. Self focusing has been an area of active scientific investigation for nearly 50 years. Coherent property of light is taken into consideration by utilizing wigner transform method in solving self focusing threshold of partially coherent light in lma silica fibers. Osa engineering equations for the filamentation collapse. Propagation characteristics of hermitecoshgaussian laser. It connects the extensive early literature on selffocusing, filamentation, selftrapping, and collapse with more recent studies aimed at issues such as selffocusing of femtosecond.
Fundamentals and prospects topics in applied physics ebook by robert w. Finally, the balance between the self focusing and plasma defocusing will set a. Fundamentals and prospects topics in applied physics by robert w. Selffocusing threshold of partially coherent light in large. We observed single filament formation for ppcrit 15, whe. Publications selected publications and presentations publications and presentations summary. Scheulin, technical digest, iqec 2005 symposium self focusing.
Relativistic gaussian laser beam self focusing in collisional quantum plasmas volume 33 issue 3 s. Numerous studies have investigated the role of photoionization in ultrafast laserinduced damage of bulk dielectrics. Past and present fundamentals and prospects topics in applied physics vol 114 berlin. Past and present is of interest to scientists and engineers working with lasers and their applications, as well as students, researchers, and laser and eye surgeons. Osa engineering equations for characterizing nonlinear. Selffocusing and filamentation of femtosecond pulses in air and condensed matter. Fundamentals and prospects topics in applied physics download online ebook techniques virales avancees collection iris download online encyclopedia of agrophysics ebook download pdf. Selffocusing and filamentation of femtosecond pulses in air. This study examines the role of spectral width and instantaneous laser frequency in laserinduced damage using a frequency dependent multiphoton ionization model and numerical simulation of an 800 nm laser pulse propagating through fused silica. Fundamentals and prospects 2009 edited by lukishova jointly with boyd and shen is one of the top 25% most downloaded ebooks in the springer ebook collection in 2012 and 2015 63. Download for offline reading, highlight, bookmark or take notes while you read femtosecond laser pulses. Download for offline reading, highlight, bookmark or take notes while you read laser physics.
Fundamentals and prospects vol 114 ed r w boyd, s g lukishova, y r shen new york. Chiao r y, gustafson t k, kelley p l 2009 self focusing. Marburger is associated with the mathematical characterization of this phenomenon. The primary consequence of plasma generation is that its defocusing effect. The threshold is a product of singlefrequency laser self focusing threshold and a correction factor including the partially coherent effect. Selffocusing of cw laser beam with variable radius in. But it can be harnessed for the design of useful devices such as optical power limiters and switches. Past and present 1115 july 2005, tokyo, japan, paper qfl24. Principles and experiments ebook written by claude rulliere. Supergaussian beams for suppression of diffraction and self focusing in highpower nd. Finally, the balance between the selffocusing and plasma defocusing will set a.
Past and present presents a comprehensive treatment of. Stationary beams and femtosecond pulses selffocusing of optical beams multifocus structure. It connects the extensive early literature on self focusing, filamentation, self trapping, and collapse with more recent studies aimed at issues such as self focusing of femtosecond pulses, white light generation, and the generation. Engineering equation for filamentation self focusing collapse. The analysis established that specific light structures were formed in a laser beam during self focusing. Stronger self focusing of chirped pulse laser with exponential plasma density ramp profile in cold quantum magnetoplasma has been presented. Previously, only the abstract had been published in j. This paper provides a validated analytical method for. Their combined citations are counted only for the first. Whitelight generation control with crossing beams of. Self focusing and filamentation of femtosecond pulses in air and condensed matter. Sapphire laser in air under self focusing and filamentation are presented. Sep 18, 20 we report the demonstration, characterization, and modeling of meterscale underwater optical filaments using a nanosecond pulsed laser. Frequency dependence in the initiation of ultrafast laser.
Splitting an ultrashort pulse into its constituent colors prior to focusing can result in more precise and betterconfined materials processing. This paper provides a validated set of engineering equations for characterizing the self focusing distance from a laser beam propagating. Radial standing and selfsimilar waves for the hyperbolic. Pdf selffocusing and solitons in photorefractive media. Shen springerverlag, new york, 2009 isbn 9780387321479. Past and present early research on selffocusing and filament formation of nanosecond and picosecond light pulses in nonlinear media is. The propagation of high peakpower laser beams in real atmospheres will be affected at long range by both linear and nonlinear effects contained therein. Selffocusing of a cw laser beam in rubidium atomic vapor was studied.
Self focusing and solitons in photorefractive media self focusing, past and present. Jan 17, 2020 the difference in the spatial structure of the strong control beam with orbital angular momentum oam and the gaussian mode will have different effects on self focusing and defocusing, which has the potential for realizing the modulation of the self focusing and the defocusing process of the probe light with oam. Ebook readable online or download on pdf djvu txt doc mp3 cfm. Conti c, di trapani p and trillo s 2009 xwaves in self focusing of ultrashort pulses self focusing. Ultrahigh power exceeding the self focusing threshold by more than three orders of magnitude light beams from groundbased laser systems may find applications in spacedebris cleaning. Enhancing precision in fslaser material processing by. The self focusing of laser pulses is analyzed on the basis of the method of diffractionbeam tubes. The propagation of high peakpower laser beams in real atmospheres has been an active research area for a couple of decades. Selffocusing often leads to damage in optical materials and is a limiting factor in the design of highpower laser systems. In the present research work, the authors have investigated the selffocusing and defocusing of hermitecoshgaussian laser hchg beam in an inhomogeneous rippled density plasmas. Past and present fundamentals and prospects springer. Stronger selffocusing of a chirped pulse laser with. Formation and propagation of meterscale laser filaments in. Aug 27, 2019 results of the theoretical study of the propagation of femtosecond pulses of a ti.
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