Characterization of laser produced plasma using laser induced breakdown spectroscopy

Journal Article · Tue Aug 15 04:00:00 EDT 2017 · Plasma Physics Reports

DOI:https://doi.org/10.1134/S1063780X17080013· OSTI ID:22760285

Ahmat, L. ^[1]; Shahzada, Shaista ^[2]; Haq, S. U.; Shah, M.; Nadeem, Ali ^[1]

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1. National Institute of Lasers and Optronics (NILOP) (Pakistan)
2. International Islamic University, Departments of Physics (Pakistan)

The plasma parameter studies of the Nd:YAG (neodymium-doped yttrium aluminum garnet, Nd:Y{sub 3}Al{sub 15}O{sub 12}) crystal by using the fundamental (1064 nm) and second (532 nm) harmonics of Nd:YAG laser are reported. The electron temperature (T{sub e}) and electron number density (N{sub e}) were determined using the Boltzmann plot method and the Stark-broadened line profile, respectively. An increase in the plasma parameters have been observed with an increase in the laser irradiance for both laser modes. The electron temperatures were calculated in the range of 0.53–0.66 eV for 1064 nm and 0.47–0.60 eV for 532 nm, and the electron number densities were determined in the range of 7.43 × 10{sup 15}–3.27 × 10{sup 16} cm{sup −3} for 1064 nm and 1.35 × 10{sup 16}–3.97 × 10{sup 16} cm{sup −3} for 532 nm in the studied irradiance range of 1.19–12.5 GW/cm{sup 2}. However, the spatial evolution of the plasma parameters investigated up to 2.75 mm away from the target surface at a fixed laser irradiance of 6.51 GW/cm2 showed a decreasing trend. In addition, the estimated values of the inverse bremsstrahlung (IB) absorption coefficients at both laser wavelengths showed that the IB process is dominant for the 1064-nm laser.

• OSTI ID: 22760285
• Journal Information: Plasma Physics Reports, Journal Name: Plasma Physics Reports Journal Issue: 8 Vol. 43; ISSN PPHREM; ISSN 1063-780X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALUMINIUM
BREMSSTRAHLUNG
DOPED MATERIALS
ELECTRON TEMPERATURE
GARNETS
LASER SPECTROSCOPY
LASER-PRODUCED PLASMA
NEODYMIUM
NEODYMIUM LASERS
RADIANT FLUX DENSITY
YTTRIUM