Analytical model for design criteria of passively Q-switched lasers

Yung-Fu Chen*, Yu-Pin Lan, H. L. Chang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

104 Scopus citations


A general and straightforward model was developed for the design of passively Q-switched lasers. With the second-threshold criterion and using a numerically fitting procedure, the output pulse energy was expressed as an analytical function of the initial transmission of the saturable absorber and the reflectivity of the output coupler. An analytical expression for the optimal output reflectivity was also obtained for maximizing the output pulse energy of a passively Q-switched laser with a given initial transmission of the saturable absorber. Excellent agreement was studied between the present results and detailed theoretical computations. A Nd:YAG laser with Cr4+:YAG as a saturable absorber was performed to illustrate the use of the present model.

Original languageEnglish
Pages (from-to)462-468
Number of pages7
JournalIEEE Journal of Quantum Electronics
Issue number3
StatePublished - 1 Mar 2001


  • Cr:YAG
  • Passively Q-switched laser
  • Saturable absorber
  • Solid-state laser

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