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Title: Tuning of the high-order harmonics generated from laser plasma plumes and solid surfaces by varying the laser spectrum, chirp, and focal position

Abstract

Tuning of the harmonic wavelength by varying the driving radiation wavelength, chirp, and intensity during the interaction of Ti:sapphire laser radiation with preformed laser plasma and solid surfaces was studied. High-order harmonics (HHG) were studied at different spectral, phase, and intensity characteristics of femtosecond radiation. Analysis of the variation of the high-order harmonic distribution in the case of different plumes is presented. We show that the tuning of harmonic wavelength allows achievement of resonance enhancement of single harmonics in the plateau distribution of HHG.

Authors:
; ; ; ; ;  [1];  [2];  [3]
  1. Akadempribor Scientific Association, Academy of Sciences of Uzbekistan, Tashkent 700125 (Uzbekistan)
  2. (India)
  3. (Japan)
Publication Date:
OSTI Identifier:
20929677
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of the Optical Society of America. Part B, Optical Physics; Journal Volume: 24; Journal Issue: 5; Other Information: DOI: 10.1364/JOSAB.24.001138; (c) 2007 Optical Society of America; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; HARMONIC GENERATION; HARMONICS; INTERACTIONS; LASER RADIATION; LASERS; LIGHT TRANSMISSION; MODULATION; NONLINEAR PROBLEMS; PLASMA; PLUMES; RESONANCE; SAPPHIRE; SPECTRA; WAVELENGTHS

Citation Formats

Ganeev, Rashid A., Naik, Prasad Anant, Singhal, Himanshu, Chakera, Juzer Ali, Gupta, Parshotam Dass, Kuroda, Hiroto, Laser Plasma Division, Raja Ramanna Centre for Advanced Technology, Indore 452013, and Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581. Tuning of the high-order harmonics generated from laser plasma plumes and solid surfaces by varying the laser spectrum, chirp, and focal position. United States: N. p., 2007. Web. doi:10.1364/JOSAB.24.001138.
Ganeev, Rashid A., Naik, Prasad Anant, Singhal, Himanshu, Chakera, Juzer Ali, Gupta, Parshotam Dass, Kuroda, Hiroto, Laser Plasma Division, Raja Ramanna Centre for Advanced Technology, Indore 452013, & Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581. Tuning of the high-order harmonics generated from laser plasma plumes and solid surfaces by varying the laser spectrum, chirp, and focal position. United States. doi:10.1364/JOSAB.24.001138.
Ganeev, Rashid A., Naik, Prasad Anant, Singhal, Himanshu, Chakera, Juzer Ali, Gupta, Parshotam Dass, Kuroda, Hiroto, Laser Plasma Division, Raja Ramanna Centre for Advanced Technology, Indore 452013, and Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581. Tue . "Tuning of the high-order harmonics generated from laser plasma plumes and solid surfaces by varying the laser spectrum, chirp, and focal position". United States. doi:10.1364/JOSAB.24.001138.
@article{osti_20929677,
title = {Tuning of the high-order harmonics generated from laser plasma plumes and solid surfaces by varying the laser spectrum, chirp, and focal position},
author = {Ganeev, Rashid A. and Naik, Prasad Anant and Singhal, Himanshu and Chakera, Juzer Ali and Gupta, Parshotam Dass and Kuroda, Hiroto and Laser Plasma Division, Raja Ramanna Centre for Advanced Technology, Indore 452013 and Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581},
abstractNote = {Tuning of the harmonic wavelength by varying the driving radiation wavelength, chirp, and intensity during the interaction of Ti:sapphire laser radiation with preformed laser plasma and solid surfaces was studied. High-order harmonics (HHG) were studied at different spectral, phase, and intensity characteristics of femtosecond radiation. Analysis of the variation of the high-order harmonic distribution in the case of different plumes is presented. We show that the tuning of harmonic wavelength allows achievement of resonance enhancement of single harmonics in the plateau distribution of HHG.},
doi = {10.1364/JOSAB.24.001138},
journal = {Journal of the Optical Society of America. Part B, Optical Physics},
number = 5,
volume = 24,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}
  • The dependence of the high-order harmonic intensity on the laser focal spot position in laser produced plasma plumes is experimentally studied. High order harmonics up to the 59th order ({lambda}{approx}13.5 nm) were generated by focusing 48 fs laser pulses from a Ti:sapphire laser system in silver plasma plume produced using 300 ps uncompressed laser radiation as the prepulse. The intensity of harmonics nearly vanished when the best focus was located in the plume center, whereas it peaked on either side with unequal intensity. The focal spot position corresponding to the peak harmonic intensity moved away from the plume center formore » higher order harmonics. The results are explained in terms of the variation of phase mismatch between the driving laser beam and harmonics radiation produced, relativistic drift of electrons, and defocusing effect due to radial ionization gradient in the plasma for different focal spot positions.« less
  • The investigation of high-order harmonic generation (HHG) of femtosecond laser pulses by means of laser-produced plasmas is surveyed. This kind of harmonic generation is an alternative to the HHG in gases and shows significantly higher conversion efficiency. Furthermore, with plasma targets there is no limitation on applicable laser intensity and thus the generated harmonics can be much more intense. In principle, harmonic light may also be generated at relativistic laser intensity, in which case their harmonic intensities may even exceed that of the focused laser pulse by many orders of magnitude. This phenomenon presents new opportunities for applications such asmore » nonlinear optics in the extreme ultraviolet region, photoelectron spectroscopy, and opacity measurements of high-density matter with high temporal and spatial resolution. On the other hand, HHG is strongly influenced by the laser-plasma interaction itself. In particular, recent results show a strong correlation with high-energy electrons generated during the interaction process. The harmonics are a promising tool for obtaining information not only on plasma parameters such as the local electron density, but also on the presence of large electric and magnetic fields, plasma waves, and the (electron) transport inside the target. This paper reviews the theoretical and experimental progress on HHG via laser-plasma interactions and discusses the prospects for applying HHG as a short-wavelength, coherent optical tool.« less
  • We report a study of the enhancement of the intensity of the 27th-harmonic radiation produced during the high-order harmonic generation from the GaAs plasma by controlling the chirp of the fundamental Ti:sapphire laser radiation. The influence of Ga and As ions on the enhancement of the 27th-harmonic radiation is also studied.
  • As a high-intensity laser-pulse reflects on a plasma mirror, high-order harmonics of the incident frequency can be generated in the reflected beam. We present a numerical study of the phase properties of these individual harmonics, and demonstrate experimentally that they can be coherently controlled through the phase of the driving laser field. The harmonic intrinsic phase, resulting from the generation process, is directly related to the coherent sub-laser-cycle dynamics of plasma electrons, and thus constitutes a new experimental probe of these dynamics.
  • A study of the spatial coherence of the high order harmonic radiation generated by the interaction of 45 fs Ti:sapphire laser beam with carbon (graphite) plasma plume has been carried out using Young's double slit interferometry. It is observed that the spatial coherence varies with harmonic order, laser focal spot size in plasma plume, and peaks at an optimal spot size. It is also observed that the spatial coherence is higher when the laser pulse is focused before the plasma plume than when focused after the plume, and it decreases with increase in the harmonic order. The optimum laser parametersmore » and the focusing conditions to achieve good spatial coherence with high harmonic conversion have been identified, which is desirable for practical applications of the harmonic radiation.« less