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High-order harmonic generation in ga...

Macklin, John Joseph.

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High-order harmonic generation in gases using intense femtosecond laser pulses.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	High-order harmonic generation in gases using intense femtosecond laser pulses./
作者:	Macklin, John Joseph.
面頁冊數:	125 p.
附註:	Source: Dissertation Abstracts International, Volume: 54-12, Section: B, page: 6258.
Contained By:	Dissertation Abstracts International54-12B.
標題:	Physics, Atomic. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9414611

High-order harmonic generation in gases using intense femtosecond laser pulses.
Macklin, John Joseph.

High-order harmonic generation in gases using intense femtosecond laser pulses. - 125 p.

Source: Dissertation Abstracts International, Volume: 54-12, Section: B, page: 6258.

Thesis (Ph.D.)--Stanford University, 1994.

This thesis describes harmonic generation of soft x-rays from atoms using a high-power Ti:sapphire laser. This laser is based on the technique of chirped-pulse amplification, and produces 60 mJ, 125-fsec laser pulses at 806 nm, with a pulse repetition rate of 5 Hz. Harmonics are obtained from Ne atoms at wavelengths down to 7.4 nm, which is the 109$\sp{\rm th}$ harmonic of the pump-laser wavelength. The laser intensity used for the experiments ranges from $\rm 10\sp{14}\ W/cm\sp2$ to about $\rm 2 \times 10\sp{15}\ W/cm\sp2$. At these intensities the atomic response is non-perturbative, and the harmonic spectrum generated exhibits a plateau in the strength of the harmonic intensities out to a cutoff order. We find for fixed laser intensity, the cutoff harmonic is approximately equal in photon energy to several times the pondermotive energy at that intensity.Subjects--Topical Terms:

1029235
Physics, Atomic.

High-order harmonic generation in gases using intense femtosecond laser pulses.
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100 1 $a Macklin, John Joseph. $3 2101103
245 1 0 $a High-order harmonic generation in gases using intense femtosecond laser pulses.
300 $a 125 p.
500 $a Source: Dissertation Abstracts International, Volume: 54-12, Section: B, page: 6258.
500 $a Adviser: Stephen E. Harris.
502 $a Thesis (Ph.D.)--Stanford University, 1994.
520 $a This thesis describes harmonic generation of soft x-rays from atoms using a high-power Ti:sapphire laser. This laser is based on the technique of chirped-pulse amplification, and produces 60 mJ, 125-fsec laser pulses at 806 nm, with a pulse repetition rate of 5 Hz. Harmonics are obtained from Ne atoms at wavelengths down to 7.4 nm, which is the 109$\sp{\rm th}$ harmonic of the pump-laser wavelength. The laser intensity used for the experiments ranges from $\rm 10\sp{14}\ W/cm\sp2$ to about $\rm 2 \times 10\sp{15}\ W/cm\sp2$. At these intensities the atomic response is non-perturbative, and the harmonic spectrum generated exhibits a plateau in the strength of the harmonic intensities out to a cutoff order. We find for fixed laser intensity, the cutoff harmonic is approximately equal in photon energy to several times the pondermotive energy at that intensity.
520 $a A model of the atomic dipole moment is discussed where the key assumption made is that a short-range potential, rather than a Coulomb potential, can adequately describe the atomic response. This assumption is in the spirit of the Keldysh approximation that is used to describe ionization of atoms in a strong, low-frequency field. Using the short-range potential model, we calculate the macroscopic emission from the interaction volume and obtain qualitative agreement with the measured intensity-dependence of the harmonics. The model predicts that the phasematching differs substantially from that based on perturbation theory. This arises because the microscopic polarization at the q$\sp{\rm th}$ harmonic saturates as a function of pump intensity, leading to a non-monotonic growth of the amplitude with intensity, and also arises due to an intensity-dependent phase of the dipole.
520 $a Blueshifting of the laser frequency indicates that for generation of harmonics up to about the 91$\sp{\rm st}$, the degree of ionization during the laser pulse is small. The use of fsec-duration pulses helps to minimize the integrated ionization, allowing higher intensity to be seen by the atoms. The prospects for increasing the efficiency through phasematching are promising, but require better knowledge of the intensity dependence of the dipole moment, and a knowledge of the role nonlinear effects play on the propagation of the fundamental beam.
590 $a School code: 0212.
650 4 $a Physics, Atomic. $3 1029235
650 4 $a Physics, Optics. $3 1018756
690 $a 0748
690 $a 0752
710 2 $a Stanford University. $3 754827
773 0 $t Dissertation Abstracts International $g 54-12B.
790 $a 0212
791 $a Ph.D.
792 $a 1994
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9414611