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Probe investigation of laser produced plasmas

A. M. Abdel Nasser, lamiaa farouk zaki, Lotfia El Nadi

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Abstract

The plasma charge separation voltage generated when a CO2 laser pulse was focused on metal targets of Al or Bi was measured for an irradiance φ of 0.1–4.5 GW cm−2 at a pressure of 5×10−2–10−5 Torr. The current flow between target and grounded wire probe 1 cm ahead was found to be proportional to φ1/3. The electric field potential detected by a transmitting wire probe was found to scale as φ0.8. The obtained results are interpreted in terms of a model for the expansion of an incompletely ionized laser produced plasma.

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What this paper is about

The plasma charge separation voltage generated when a CO2 laser pulse was focused on metal targets of Al or Bi was measured for an irradiance φ of 0.1–4.5 GW cm−2 at a pressure of 5×10−2–10−5 Torr. The current flow between target and grounded wire probe 1 cm ahead was found to be proportional to φ1/3. The electric field potential detected by a transmitting wire probe was found to scale as φ0.8. The obtained results are interpreted in terms of a model for the expansion of an incompletely ionized laser produced plasma.

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Available abstract

The plasma charge separation voltage generated when a CO2 laser pulse was focused on metal targets of Al or Bi was measured for an irradiance φ of 0.1–4.5 GW cm−2 at a pressure of 5×10−2–10−5 Torr. The current flow between target and grounded wire probe 1 cm ahead was found to be proportional to φ1/3. The electric field potential detected by a transmitting wire probe was found to scale as φ0.8. The obtained results are interpreted in terms of a model for the expansion of an incompletely ionized laser produced plasma.

Key concepts: Plasma, Laser, Torr, Atomic physics, Ionization, Electric field, Materials science, Voltage

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