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Title: Third harmonic generation in air ambient and laser ablated carbon plasma

We report the third harmonic generation of a nanosecond laser pulse (1.06 μm) in air ambient and in the presence of nanoparticles from laser ablated carbon plasma. Significant decrease in the threshold of third harmonic generation and multi-fold increment in the intensity of generated third harmonic is observed in presence of carbon plasma. The third harmonic in air is due to the quasi-resonant four photon process involving vibrationally excited states of molecular ion of nitrogen due to electron impact ionization and laser pulse. Following optical emission spectroscopic observations we conclude that the presence of C{sub 2} and CN in the ablated plume play a vital role in the observed third harmonic signals.
Authors:
; ;  [1]
  1. Department of Physics, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208016 (India)
Publication Date:
OSTI Identifier:
22489962
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 12; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ABLATION; AIR; CARBON; CARBON NITRIDES; ELECTRONS; EMISSION SPECTROSCOPY; EXCITED STATES; HARMONIC GENERATION; IONIZATION; LASER RADIATION; MOLECULAR IONS; NANOPARTICLES; NITROGEN; PLASMA; SIGNALS