Simulation of Second Harmonic Generation of a Pulsed Nd:YAG Laser Using Nonlinear Crystals: with the Approach of Efficiency Investigation

Document Type : Research Paper

Authors

1 PhD Student in atomic and molecular physics, Physics Department, Iran University of Sciencs and Technology, Tehran, Iran

2 Researcher, Physics Department, Imam Hussein University, Tehran, Iran

Abstract

Second harmonic generation of Nd:YAG laser, as one of the most applicable and popular solid-state lasers, has been widely used in different fields of military applications and in diverse fields of medicine and industry etc., in last few decades. Non-linear crystals are mentioned as one of the most efficient and common methods for harmonic generating of lasers. In this research, we performed the simulation of the second and fourth harmonic generation of pulsed Nd:YAG laser with characteristics of 1064nm wavelength, 1joule/cm2 energy density, and 10ns pulse width, and considering the effects of temperature and divergence angle of the incident beam. The conversion efficiency of the second harmonic generation of this laser was investigated using KTP, BBO and LBO crystals. The simulation results suggested the KTP crystal as the most efficient crystal with 89.59% conversion efficiency. Formerly, achieving 80% efficiency using Nd: YAG laser with similar characteristics of the simulated specifications presented in this paper by using KTP crystal in an experimental configuration had been presented. In addition, the conversion efficiency of the fourth harmonic generation of this laser was investigated using BBO, CLBO and DKDP crystals. The simulation results suggested the BBO crystal as the most efficient crystal with 19.21% conversion efficiency. For the sake of comparison, 12% efficiency in the experimental layout with similar Nd:YAG laser specifications, presented in this article, had been presented in another article.

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References

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History

  • Receive Date: 27 February 2020
  • Revise Date: 05 July 2020
  • Accept Date: 27 June 2020

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