Analysis of spectra of acoustic signals generated by high-power pulsed laser radiation propagating in the atmosphere. I. Spectra of local plasma formations

Shamanaev, S. V.; Shamanaeva, L. G.

doi:10.1007/s11182-006-0045-5

Cited by 5 publications

(4 citation statements)

References 1 publication

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“…The frequency of the minimum is correlated with the average separation of plasma formations, that is, with their concentration per unit length. As demonstrated in [2,11,23], the frequency of the maximum is correlated with the average acoustic pulse duration from individual plasma formations, and the amplitude and width of the maximum depend on the number of Fig. 9.…”

Section: Acoustic Radiation From a Long Laser Sparkmentioning

confidence: 77%

“…Acoustic signal characteristics were experimentally investigated in [9,10,23] under laboratory conditions. A breakdown was initiated by focusing radiation of a neodymium GOS 1001 laser (λ = 1.06 μm, E L max = 1 kJ, and τ L = 1 ms) with a short-focus lens at distances of 25-50 cm.…”

Section: Characteristics Of the Acoustic Signal From An Individual Somentioning

confidence: 99%

“…The time history of acoustic signal from the laser spark initiated on an ensemble of monodisperse 7-μm SiC particles is shown in Fig. 6a [23]. Experiments demonstrated that each individual plasma formation is a spherical source of the acoustic pulse, and the total acoustic signal from the particle ensemble represents a linear superposition of individual pulses.…”

Section: Characteristics Of Acoustic Signals Generated By Ensembles Omentioning

confidence: 99%

“…For laser energy densities less than this threshold value, the atmospheric aerosol does not change its phase state, and acoustic radiation is generated due to the thermal expansion of the HPLR propagation channel (the thermooptical mechanism of sound pulse generation). Experimental and theoretical investigations into the mechanisms of acoustic wave generation in the atmosphere upon exposure to laser radiation and the special features of acoustic pulses from solid and liquid aerosol particles have been performed at the Institute of Atmospheric Optics of the Siberian Branch of the Russian Academy of Sciences since 1980 [1- 20,22,23,[27][28][29][30][31][32][33][34]41]. A brief review of experimental and theoretical works on laser-induced shock waves through 1990 was presented in [16].…”

Section: Introductionmentioning

confidence: 99%

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Sound generation in the atmosphere upon exposure to high-power milli- and microsecond laser pulses

2009

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A review of works on generation of acoustic pulses in the atmosphere upon exposure to high-power laser pulses is presented in this paper. Characteristics of sound pulses in the atmosphere accompanying the propagation of high-power milli-and microsecond laser pulses, including the peak sound pressure level and the shape and spectrum of acoustic pulses, are discussed. The special features of acoustic pulses from individual liquid and solid aerosol particles and ensembles of monodisperse particles and polydisperse atmospheric aerosol are discussed. The characteristics of acoustic signals from long laser sparks and collective optical discharges are considered.

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Section: Acoustic Radiation From a Long Laser Sparkmentioning

confidence: 77%

Section: Characteristics Of the Acoustic Signal From An Individual Somentioning

confidence: 99%

Section: Characteristics Of Acoustic Signals Generated By Ensembles Omentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Sound generation in the atmosphere upon exposure to high-power milli- and microsecond laser pulses

2009

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Monitoring the deposited energy in laser-induced plasmas with an acoustic approach

Chai

Zhou

2022

Appl. Opt.

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The monitoring of energy deposition behavior during the plasma formation process is the basis of recently developed laser-induced breakdown thermometry techniques. Utilizing the acoustic waveforms from laser-induced plasmas, a method to monitor the deposited energy was proposed. The linear relationships between the acoustic energy and the deposited energy were established under four different focal lengths. After the distortions in the sound propagation were corrected, the applicable range of this method was extended to a deposited energy from 10 to 240 mJ. The further spectra analysis in the deposited energy space suggested that the total number density of excited species increased with the deposition energy, without significant fluctuations in plasma temperature in the high-energy region.

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Acoustic characteristics of laser-induced plasmas from the forming dynamics perspective

Wu,

Chai,

Zhou

2023

Appl. Opt.

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The acoustic signal has demonstrated its capabilities in assisting laser-induced breakdown spectroscopy (LIBS) measurements. In this study, the acoustic characteristics of laser-induced plasmas (LIPs) under different levels of energy deposition were analyzed, and their correlation with LIP forming dynamics was investigated. In the deposited energy space, two zones in the acoustic pressure and duration were observed, featuring a clear transition point in 100 mJ. The analysis based on self-emission spectra and images suggested that this transition is a result of the change in plasma forming dynamics. Above 100mJ, the plasma temperature and electron density were saturated; thus, any further increase in deposited energy only contributes to the plasma size. In this regime, the acoustic wave from the significantly elongated plasma no longer satisfied the ideal spherical assumption. The observation was also strengthened by the analysis in the frequency domain. Moreover, the correlation between acoustic and radiation signals was also changed significantly with plasma forming dynamics. This study offers a systematic analysis of LIP acoustic signals on the deposited energy space. The potential of using acoustic measurement to interpret the plasma forming dynamics was demonstrated, which could be beneficial for the successful implementations of acoustic-aided LIBS.

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Analysis of spectra of acoustic signals generated by high-power pulsed laser radiation propagating in the atmosphere. I. Spectra of local plasma formations

Cited by 5 publications

References 1 publication

Sound generation in the atmosphere upon exposure to high-power milli- and microsecond laser pulses

Sound generation in the atmosphere upon exposure to high-power milli- and microsecond laser pulses

Monitoring the deposited energy in laser-induced plasmas with an acoustic approach

Acoustic characteristics of laser-induced plasmas from the forming dynamics perspective

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