A plasma shutter to generate a synchronized subnanosecond pulse for optical probing of laser-produced plasmas

Dhareshwar, L. J.; Naik, P. A.; Bhawalkar, D. D.

doi:10.1063/1.1142130

Cited by 9 publications

(4 citation statements)

References 14 publications

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“…Laser-induced sparks have been used as a source for producing high-intensity x rays 9 and extreme UV radiation in rare gases 10 and also for producing ultrafast shutters. 11 They are also capable of igniting gaseous mixtures or even of extinguishing a diffusion flame. 12 Apart from these applications, lasercreated sparks can be used as a source for atomic emission spectrometry; in this case the technique is referred to as laser-induced breakdown spectrometry.…”

Section: Introductionmentioning

confidence: 99%

Spatial and temporal evolution of argon sparks

Harilal¹

2004

Appl. Opt.

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Optical emission spectroscopic studies of laser-created argon spark are carried out. Pulses of 532 nm and 8 ns from a frequency-doubled Nd:YAG laser are used to create an argon spark at 1 atm. 2 Gated photography of 2 ns is used to investigate spark evolution at early times. Electron temperature and density measurements are made from the spectral data. The Stark broadening of emission lines is used to determine the electron density, and the Boltzmann plot of the singly ionized argon-line intensities is exploited for determinating electron temperature. The dependence on electron temperature and density on different experimental parameters, such as distance from the focal point, delay time after the initiation of the spark, and laser energy, are discussed.

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Section: Introductionmentioning

confidence: 99%

Spatial and temporal evolution of argon sparks

Harilal¹

2004

Appl. Opt.

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“…Laser-induced sparks have been used both as a source for producing x rays 1 and extreme UV radiation 2 in rare gases and to produce ultrafast shutters. 3,4 They are also capable of igniting gaseous mixtures 5 or even extinguishing a diffusion flame. 6 It is well recognized that for the creation of a laser spark, various mechanisms may act simultaneously and their relative contributions not only depend on initial conditions but also change during the growth of the spark with time.…”

Section: Introductionmentioning

confidence: 99%

Laser propagation and energy absorption by an argon spark

Bindhu

Harilal

Tillack

et al. 2003

Journal of Applied Physics

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The laser propagation and energy absorption of an argon spark induced by a laser at different pressures is investigated. 8 ns pulses from a frequency-doubled Q-switched Nd:YAG laser are used to create the spark. The pressure of the argon is varied from 1 atm to 10 Torr. Significant energy absorption by the plasma is observed at high pressures (Ͼ100 Torr) while there is negligible absorption when the pressure is lower than 50 Torr. The plasma kernel showed distinct behavior with respect to laser energy. At a laser energy well above the breakdown threshold, the spark moved only in the backward direction and the forward component was absent indicating the strong absorption of the laser by the spark front. A spiky behavior is observed in the transmitted temporal profiles of the laser at higher energies and at high pressures and can be due to the formation of a self-regulating regime.

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“…1,2 This high-pressure region develops a shock wave into the ambient medium that has sufficient strength to ignite a gaseous mixture 3 or to extinguish a diffusion flame. 4 Laser-induced gaseous plasmas can be used for a variety of applications including elemental analysis, 5,6 detecting airborne biological agents, 7 quantitative analysis of aerosols, 8 production of X-rays and soft X-rays, 9,10 ultra fast shutters, 11 etc. Gas breakdown studies represent the initial step in research in inertial confinement fusion (ICF) and plasma heating by laser radiation.…”

Section: Introductionmentioning

confidence: 99%

Energy Absorption and Propagation in Laser-Created Sparks

et al. 2004

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The energy absorption and laser propagation characteristics of air and argon sparks at one atmosphere have been investigated. To create the sparks, 532 nm pulses from a frequency doubled Qswitched Nd : YAG laser are used. We employed 2 ns gated fast photography for studying the time evolution of the kernel at early times. Optical emission spectroscopy is used to infer temperature and density of the sparks. Significant energy absorption by the plasma is observed just above the breakdown threshold. The energy absorption and propagation in the spark indicated that argon plasma is more absorptive than air plasma. The absorption of the spark increases with laser energy, and at higher energies absorption saturation is observed. A spiky behavior is observed in the transmitted temporal profiles of lasers at higher energies and this is explained as due to the formation of a self-regulating regime.

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A plasma shutter to generate a synchronized subnanosecond pulse for optical probing of laser-produced plasmas

Cited by 9 publications

References 14 publications

Spatial and temporal evolution of argon sparks

Spatial and temporal evolution of argon sparks

Laser propagation and energy absorption by an argon spark

Energy Absorption and Propagation in Laser-Created Sparks

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