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Interaction of intense laser pulses ...

Alexeev, Ilya Semenovich.

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Interaction of intense laser pulses with gaseous media: Several exotic propagation effects in the femtosecond regime.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Interaction of intense laser pulses with gaseous media: Several exotic propagation effects in the femtosecond regime./
Author:	Alexeev, Ilya Semenovich.
Description:	120 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-06, Section: B, page: 2729.
Contained By:	Dissertation Abstracts International64-06B.
Subject:	Physics, Fluid and Plasma. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3094449

Interaction of intense laser pulses with gaseous media: Several exotic propagation effects in the femtosecond regime.
Alexeev, Ilya Semenovich.

Interaction of intense laser pulses with gaseous media: Several exotic propagation effects in the femtosecond regime. - 120 p.

Source: Dissertation Abstracts International, Volume: 64-06, Section: B, page: 2729.

Thesis (Ph.D.)--University of Maryland College Park, 2003.

The experiments described in this thesis, illustrate effects that are observable only in the femtosecond pulse regime. Moderately high peak intensity (>10<super>15</super> W/cm<super>2</super>) is essential for these experiments, and this is set by the threshold for optical field ionization of atoms.Subjects--Topical Terms:

1018402
Physics, Fluid and Plasma.

Interaction of intense laser pulses with gaseous media: Several exotic propagation effects in the femtosecond regime.
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035 $a (UnM)AAI3094449
035 $a AAI3094449
040 $a UnM $c UnM
100 1 $a Alexeev, Ilya Semenovich. $3 1943060
245 1 0 $a Interaction of intense laser pulses with gaseous media: Several exotic propagation effects in the femtosecond regime.
300 $a 120 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-06, Section: B, page: 2729.
500 $a Chair: Howard M. Milchberg.
502 $a Thesis (Ph.D.)--University of Maryland College Park, 2003.
520 $a The experiments described in this thesis, illustrate effects that are observable only in the femtosecond pulse regime. Moderately high peak intensity (>10<super>15</super> W/cm<super>2</super>) is essential for these experiments, and this is set by the threshold for optical field ionization of atoms.
520 $a We first examine the ionization scattering instability. This instability results directly from the very strong dependence of the optical field ionization rate on the laser electric field amplitude. Pulse propagation is accompanied by strong filamentary modulations in the electron density, which scatter the pulse leading to further modulations. Eventually, transverse beam breakup can occur. This is a universal effect that occurs for all pulses in excess of the field ionization threshold intensity. It is for shorter pulses of moderate intensity that the effect is most evident, where the instability can be present for the full pulse duration. Accompanying the modulations, we measure significant second harmonic generation.
520 $a We next study the propagation of femtosecond pulses in clustered gases produced by the adiabatic expansion and cooling of ordinary gases in high-pressure nozzle flow into vacuum. In the intense laser heating of these clusters, we have discovered a macroscopic effect on the heating beam. If the laser pulse is still on before the clusters have fully exploded, the beam can self-focus. This stands in strong contrast to the beam spreading effect observed in unclustered gases. The self-focusing effect is explained in terms of the explosive dynamics of the individual clusters induced by the laser pulse.
520 $a Finally, we used our femtosecond time resolving diagnostics to explore a phenomenon predicted earlier: the measurement of superluminal ionization fronts induced by intense Bessel beams. Using our femtosecond laser system, the superluminal group velocity of an ultrashort optical Bessel beam pulse was measured for its entire depth of field, corresponding to &sim;2 × 10<super>4</super> optical wavelengths. To do this, we measured speed of the ionization front induced by the laser pulse, which travels at the Bessel beam pulse group velocity. Our experiment shows that pulse envelope can travel at superluminal speed and can generate physically observable phenomenon.
590 $a School code: 0117.
650 4 $a Physics, Fluid and Plasma. $3 1018402
650 4 $a Physics, Optics. $3 1018756
690 $a 0759
690 $a 0752
710 2 0 $a University of Maryland College Park. $3 1249734
773 0 $t Dissertation Abstracts International $g 64-06B.
790 1 0 $a Milchberg, Howard M., $e advisor
790 $a 0117
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3094449