Effect of Laser Energy and Repetition Rate on Holmium Plasma Emission

Effect of Laser Energy and Repetition Rate on Holmium Plasma Emission

  • Nipras nazeh mahmoad Institute of Laser for Postgraduate Studies, University of Baghdad, Baghdad, Iraq
  • Mahmoad shakir Mahmoad
Keywords: Emission spectra, , pulse energy,, , Nd-YAG laser, holmium.

Abstract

The holmium plasma induced by a 1064-nmQ-switched Nd:YAG laser in air was investigated. This work was done theoretically and experimentally.  Cowan code was used to get the emission spectra for different transition of the holmium target. In the experimental work, the evolution of the plasma was studied by acquiring spectral images at different laser pulse energies (600,650,700, 750, and 800 mJ). The repetition rates of (1Hz and 10Hz) in the UV region (200-400 nm). The results indicate that, the emission line intensities increase with increasing of the laser pulse energy and repetition rate. The strongest emission spectra appeared when the laser pulse energy is 800mJ and 10 Hz repetition rate at λ= 345.64nm, with the maximum intensity of 77000 counts.

Published
2020-02-27
Section
Articles