Risky intensity peaks resulting from nonlinear holographic imaging

Гаранин, С. Г.; Epatko, I V; Istomin, Roman I.; L'vov, L V; Malyutin, A A; Serov, R V; Sukharev, Stanislaw A.

doi:10.1364/ao.50.003733

Cited by 7 publications

(2 citation statements)

References 10 publications

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“…Epatko I. V. et al studied the location shift of hot images [28][29] . Wang et al theoretically investigated obscuration size dependence of hot image in self-focusing media with gain and loss [30] .…”

Section: Introductionmentioning

confidence: 99%

Characteristics of nonlinear imaging of broadband laser stacked by chirped pulses

et al. 2014

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Nanosecond-level pulses of specific shape is usually generated by stacking chirped pulses for high-power inertial confinement fusion driver, in which nonlinear imaging of scatterers may damage precious optical elements. We present a numerical study of the characteristics of nonlinear imaging of scatterers in broadband laser stacked by chirped pulses to disclose the dependence of location and intensity of images on the parameters of the stacked pulse. It is shown that, for sub-nanosecond long sub-pulses with chirp or transform-limited sub-pulses, the time-mean intensity and location of images through normally dispersive and anomalously dispersive self-focusing medium slab are almost identical; While for picosecond-level short sub-pulses with chirp, the time-mean intensity of images for weak normal dispersion is slightly higher than that for weak anomalous dispersion through a thin nonlinear slab; the result is opposite to that for strong dispersion in a thick nonlinear slab; Furthermore, for given time delay between neighboring sub-pulses, the time-mean intensity of images varies periodically with chirp of the sub-pulse increasing; for a given pulse width of sub-pulse, the time-mean intensity of images decreases with the time delay between neighboring sub-pulses increasing;additionally, there is a little difference in the time-mean intensity of images of the laser stacked by different numbers of sub-pulses. Finally, the obtained results are also given physical explanations.

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Section: Introductionmentioning

confidence: 99%

Characteristics of nonlinear imaging of broadband laser stacked by chirped pulses

et al. 2014

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“…In Ref. [4] it has been shown that at value of B-integral of only 0.2 rad a round opaque obscuration increases the intensity peak which exceeds the average level by almost 1.5 times, and for a phase obstacle the peak excess is 2.5. One can present a disk amplifier as a system of periodically located (SPL) nonlinear mediums (NM).…”

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Formation of nonlinear holographic images in a system of periodically located nonlinear mediums

Belkov

Гаранин

Epatko

et al. 2013

EPJ Web of Conferences

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Abstract. The formation of nonlinear holographic images in a system of periodically located nonlinear mediums is studied. Analytical expressions which describe the magnitudes and locations of intensity maximums depending on the corresponding image number are derived. Comparison with numerical calculation results is presented.Dependence of a refraction index on intensity leads to beam self-focusing [1], transverse instability [2] and to formation of nonlinear holographic images (NHI) of obstacles in the optical path of powerful laser systems [3]. In Ref.[4] it has been shown that at value of B-integral of only 0.2 rad a round opaque obscuration increases the intensity peak which exceeds the average level by almost 1.5 times, and for a phase obstacle the peak excess is 2.5. One can present a disk amplifier as a system of periodically located (SPL) nonlinear mediums (NM). Formation of NHI in SPLNM differs from the NHI formation in continuous media with the same value of B-integral.For the first time this problem has been considered in Ref. [3]. However, these authors [3] focused only on the analysis of the intensity dependence upon the size of an obscuration at a single point of space. Accidentally for SPLNM configuration considered in Ref. [3], the intensity in the chosen point is not a peak one. The locations of the NHI and their intensity were not explored. In Refs [5, 6] the results of peak intensity calculations for the various elements of the NIF laser chain with account for NHI formation were published. In Refs [7-9] the process of the NHI formation in a SPLNM was viewed in more details and it was shown that for KNM there are K NHI. However the chosen model parameters (number of NM, increment of B-integral for one NM, thickness of NM, size of the beam) are far from the parameters of typical disk amplifiers.In this paper, we are considering the simplified system of infinitely thin NM without energy gain and losses. According to expression (39) in Ref. [3], when the powerful plane wave and spherical scattered wave incident on the single NM, the new wave is generated. For the infinitely thin NM the complex amplitude A 1 of this wave in the plane of NHI is equal towhere A s is the complex amplitude of the scattered wave in the plane of obstacle.After passage of a NM the incident scattered wave changes toLet us note that upon the derivation of Eq. (39) in Ref.[3], it was not assumed that the incident scattered wave is diverging. Therefore expressions (1) and (2) remain valid for a converging incident wave. In This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Nonlinear imaging in optical path with linear negative and positive refractive-index media

Tang

2020

Appl. Phys. B

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Risky intensity peaks resulting from nonlinear holographic imaging

Cited by 7 publications

References 10 publications

Characteristics of nonlinear imaging of broadband laser stacked by chirped pulses

Characteristics of nonlinear imaging of broadband laser stacked by chirped pulses

Formation of nonlinear holographic images in a system of periodically located nonlinear mediums

Nonlinear imaging in optical path with linear negative and positive refractive-index media

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