Power scale-up of high-pulse-energy passively Q-switched Nd:YLF laser: Influence of negative thermal lens enhanced by upconversion

Y. J. Huang, C. Y. Tang, Y. P. Huang, S. C. Huang, Kuan-Wei Su, Yung-Fu Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

We develop a practical method to extend the power scale-up for a laser in a concave-plano cavity to be influenced by a large negative thermal lens. With the developed method, we successfully scale up the output power of a compact highpulse-energy passively Q-switched Nd:YLF laser at 1053 nm with the Cr 4+:YAG crystal as a saturable absorber. At an incident pump power of 12.6 W, the maximum output power under the optimum operation at 1053 nm reaches 2.61 W with a pulse width of 6 ns and a pulse repetition rate of 4.6 kHz. More importantly, we experimentally verify that the energy-transfer upconversion significantly enhances the negative focal length of thermal lens in the passively Q-switched Nd:YLF laser.

Original languageEnglish
Pages (from-to)625-630
Number of pages6
JournalLaser Physics Letters
Volume9
Issue number9
DOIs
StatePublished - 2 Oct 2012

Keywords

  • Energy-transfer upconversion
  • Nd:YLF
  • Passive Q-switching
  • Thermal lens

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