Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Evanescent-field Q-switched Yb:YAG Channel Waveguide Lasers with Single- and Double-pass Pumping

  • Bae, Ji Eun (Department of Physics, Korea Advanced Institute of Science and Technology) ;
  • Choi, Sun Young (Department of Physics, Korea Advanced Institute of Science and Technology) ;
  • Krankel, Christian (Zentrum fur Lasermaterialien, Leibniz-Institut fur Kristallzuchtung) ;
  • Hasse, Kore (Institut fur Laser-Physik, Universitat Hamburg) ;
  • Rotermund, Fabian (Department of Physics, Korea Advanced Institute of Science and Technology)
  • Received : 2020.12.11
  • Accepted : 2021.02.05
  • Published : 2021.04.25
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Abstract

A femtosecond-laser inscribed Yb:YAG surface channel waveguide (WG) laser with single-walled carbon nanotubes deposited on the top surface of the WG was passively Q-switched by evanescent field interaction. Q-switched operation of the 14-mm-long compact Yb:YAG WG laser was achieved near 1031 nm with two different pumping schemes (single- and double-pass pumping) with an output coupling transmission of 91%. The Q-switched pulse characteristics depending on the absorbed pump power were investigated for both pumping geometries and analyzed in detail based on theoretical modeling. The best performances (energy/pulse duration) for each configuration were 204.4 nJ/75 ns at a repetition rate of 1.87 MHz, and 201.1 nJ/81 ns at 1.75 MHz for single- and double-pass pumping, respectively.

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References

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