Undamped undulation superposed on the passive Q-switching pulse of a CO2 laser

M. Tachikawa, K. Tanii, M. Kajita, T. Shimizu

Research output: Contribution to journalArticle

51 Citations (Scopus)


An undamped undulation superposed on the pulse tail of the passive Q-switching is observed using HCOOH gas as a saturable absorber. The pulse shapes with the undulation are nicely reproduced through the rate-equation analysis in which the laser gain medium is described as a three-level system. Good agreements between the observation and the calculation are also obtained in the dependence of the period and the width of passive Q-switching pulse on laser parameters. The mechanism of the undulation is interpreted as the relaxation oscillation attributed to the relaxation from the lower laser level. The collisional rate constant of HCOOH molecule is also obtained.

Original languageEnglish
Pages (from-to)83-90
Number of pages8
JournalApplied Physics B Photophysics and Laser Chemistry
Issue number2
Publication statusPublished - 1 Feb 1986


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