Strong enhancement and extinction of single harmonic intensity in the mid- and end-plateau regions of the high harmonics generated in weakly excited laser plasmas

Ganeev, R. A.; Naik, P. A.; Singhal, H.; Chakera, J. A.; Gupta, P. D.

doi:10.1364/ol.32.000065

Cited by 88 publications

(54 citation statements)

References 12 publications

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“…This was confirmed in multiple studies following the initial observation of this phenomenon in indium plasma [19]. In particular, strong enhancement of a single harmonic was reported in Cr [20] and Mn [9] plasmas. The Mn plasma is of special interest since it showed the highest harmonic cut-off energy observed in plasma plumes (101 st harmonic of Ti:sapphire laser [9]).…”

Section: Isolated Sub-femtosecond Xuv Pulse Generation In Mn Plasmasupporting

confidence: 63%

New Approaches in Frequency Conversion of Laser Radiation in Plasma Plumes

Ganeev¹

2013

OPJ

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Recent studies of plasma harmonic generation are reviewed. We show the advances of this technique for generation of coherent ultrashort pulses in the extreme ultraviolet range. Among the achievements highlighted in this review are the comparative experimental and theoretical studies of high-order harmonic generation in silver plasma, isolated subfemtosecond pulse generation in Mn plasma ablation, stable generation of high-order harmonics of femtosecond laser radiation from laser produced plasma plumes at 1 kHz pulse repetition rate, and high-order harmonic generation in fullerenes using few-and multi-cycle pulses of different wavelengths. We show that new developments of plasma harmonic studies can lead to the creation of an attractive field of laser ablation induced high-order harmonic generation spectroscopy.

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Section: Isolated Sub-femtosecond Xuv Pulse Generation In Mn Plasmasupporting

confidence: 63%

New Approaches in Frequency Conversion of Laser Radiation in Plasma Plumes

Ganeev¹

2013

OPJ

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“…We conclude that in our case the resonant enhancement of the macroscopic HH emission is dominated by reduced absorption due to Fano-resonances in the photoabsorption spectrum of the generation medium. Notably, the enhancement mechanism is of different nature than what has previously been observed for various transitionmetal ions [15,16].…”

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confidence: 60%

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confidence: 99%

“…In particular, Ganeev et al observed a significant resonant enhancement of a single harmonic order in laser-generated indium plasma plumes [15,16] which they attribute to resonant transitions between autoionizing states and the ground state of singly charged transition metal ions. Their work inspired a number of theoretical and experimental studies about the physical nature of the enhancement process [17][18][19][20].…”

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confidence: 99%

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Enhancing the Macroscopic Yield of Narrow-Band High-Order Harmonic Generation by Fano Resonances

et al. 2014

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Resonances in the photo-absorption spectrum of the generating medium can modify the spectrum of high order harmonics. In particular, window-type Fano resonances can reduce photo-absorption within a narrow spectral region and, consequently, lead to an enhanced emission of high-order harmonics in absorptionlimited generation conditions. For high harmonic generation in argon it is shown that the 3s3p 6 np 1 P 1 window resonances (n=4,5,6) give rise to enhanced photon yield. In particular, the 3s3p 6 4p 1 P 1 resonance at 26.6 eV allows a relative enhancement up to a factor of 30 compared to the characteristic photon emission of the neighboring harmonic order. This enhanced, spectrally isolated and coherent photon emission line has a relative energy bandwidth of only ΔE/E=3·10 -3 . Therefore, it might be directly applied for precision spectroscopy or coherent diffractive imaging without the need of additional spectral filtering. The presented mechanism can be employed for tailoring and controlling the high harmonic emission of manifold target materials. High harmonic generation (HHG) driven by a strong laser field represents an attractive method for generating coherent radiation in the extreme ultraviolet spectral region [1,2] and is, nowadays, widely employed in atomic, molecular, plasma and solid state physics. Recently, even keV photon energies have been demonstrated by HHG providing a bright source of coherent X-rays [3]. In addition, HHG allows producing extremely short attosecond pulses, which enable groundbreaking investigations in the field of attosecond science [4]. Typically, HHG suffers however from its inherently low conversion efficiency, which hinders applications that are especially dependent on a high photon flux in order to achieve a good signal-to-noise ratio.In a simple single atom picture HHG can be described by a three-step model [5]: First, an electron tunnel-ionizes through the atomic potential, which is modified by the strong laser field. Second, the electron propagates in the strong laser field. Finally, the electron may recombine with its parent ion and gives, thus, rise to the emission of a photon (third step). In this picture, the power emitted by a single atom at the frequency ω q is proportional to the square of the amplitude of the oscillating dipole |A q (t)| 2 , which is induced by the recombination process [5].While the response of a single atom to the laser field (A q ) is extremely small, phase matching of a large number of emitters gives rise to a coherent build-up of high-order harmonic (HH) emission along the propagation direction of the driving laser through the generation medium.By optimizing the macroscopic generation conditions, hence, maximizing the number of phase-matched emitters, conversion efficiencies as high as of 4·10 -4 at 73 nm (17 eV) [6] and 5·10 -5 at 53 nm (23.3 eV) [7] have been achieved with 800 nm driving wavelength. With the help of a simple model, which takes the emission of all emitters along the propagation axis, phase-mismatch and absorption into accou...

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“…When laser pulse duration was varied from unchirped 48 fs to negatively chirped 250 fs, intensity of 13 th harmonic became comparable to that of its neighbors. These observations indicate that intensity enhancement 11) occurs due to resonance of the harmonic wavelength with one of the transitions in the atoms/ions of the plasma. Similarly extinction 11) was also seen in plasma plumes from other targets.…”

Section: High Order Harmonic Generationmentioning

confidence: 83%

Ultra-intense Laser Plasma Interaction Studies at RRCAT, Indore

Gupta

Naik

2008

The Review of Laser Engineering

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The Laser Plasma Division at the Raja Ramanna Centre for Advanced Technology (RRCAT), Indore has been engaged in research and development activities on laser plasma interaction using 10 TW, 45 fs, Ti:sapphire laser and a variety of in-house developed diagnostic systems for ultrashort laser pulses, plasma and x-ray radiation. Our recent studies include laser wakefield electron acceleration, high order harmonic generation, resonance enhancement of single harmonics, MeV energy bremsstrahlung radiation, absorption of ultrashort laser pulses in in-situ produced metal clusters, and ultrashort pulse K-shell x-ray line emission. This paper briefly describes these studies and important results obtained.

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Strong enhancement and extinction of single harmonic intensity in the mid- and end-plateau regions of the high harmonics generated in weakly excited laser plasmas

Cited by 88 publications

References 12 publications

New Approaches in Frequency Conversion of Laser Radiation in Plasma Plumes

New Approaches in Frequency Conversion of Laser Radiation in Plasma Plumes

Enhancing the Macroscopic Yield of Narrow-Band High-Order Harmonic Generation by Fano Resonances

Ultra-intense Laser Plasma Interaction Studies at RRCAT, Indore

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