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Characterization of Terahertz Radiation Generated in an Organic Crystal

Author:
  • Åsa Bengtsson
Publishing year: 2016
Language: English
Document type: Student publication for Master's degree (two years)

Summary

The terahertz region of the electromagnetic spectrum is an important research area allowing insights into fundamental science such as inter-molecular interactions, and with applications in the environmental, medical and security field. Using femtosecond lasers, it is possible to design compact and efficient terahertz generation schemes, resulting in few-cycle broadband pulses. This master thesis is concerned with generating terahertz radiation through optical rectification in the organic crystal DSTMS. This crystal has a high second order nonlinear coefficient and is phase matched for a 1500 nm pump laser. Terahertz radiation was successfully generated, with a maximum energy of 3.75 $\mu$J, corresponding to a generation efficiency of 0.71$\%$ at a pump laser energy of 530 $\mu$J. The theoretical background of this process, as well as the practical work is presented in this thesis.

Keywords

  • Physics and Astronomy
  • Nonlinear optics
  • Terahertz radiation generation
  • Optical rectification
  • Difference frequency generation
  • Organic crystal
  • DSTMS

Other

  • Jörgen Larsson