skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

Abstract

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
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 22; Journal Issue: 12; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
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

Citation Formats

Singh, Ravi Pratap, E-mail: ravips@iitk.ac.in, Gupta, Shyam L., and Thareja, Raj K. Third harmonic generation in air ambient and laser ablated carbon plasma. United States: N. p., 2015. Web. doi:10.1063/1.4937419.
Singh, Ravi Pratap, E-mail: ravips@iitk.ac.in, Gupta, Shyam L., & Thareja, Raj K. Third harmonic generation in air ambient and laser ablated carbon plasma. United States. https://doi.org/10.1063/1.4937419
Singh, Ravi Pratap, E-mail: ravips@iitk.ac.in, Gupta, Shyam L., and Thareja, Raj K. 2015. "Third harmonic generation in air ambient and laser ablated carbon plasma". United States. https://doi.org/10.1063/1.4937419.
@article{osti_22489962,
title = {Third harmonic generation in air ambient and laser ablated carbon plasma},
author = {Singh, Ravi Pratap, E-mail: ravips@iitk.ac.in and Gupta, Shyam L. and Thareja, Raj K.},
abstractNote = {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.},
doi = {10.1063/1.4937419},
url = {https://www.osti.gov/biblio/22489962}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 12,
volume = 22,
place = {United States},
year = {Tue Dec 15 00:00:00 EST 2015},
month = {Tue Dec 15 00:00:00 EST 2015}
}