Time-dependent oscillations in a cw chemical laser unstable resonator

Lee H. Sentirían, Munir H. Nayfeh, Steven W. Townsend, Kevin King, Gus Tsioulos, Jay Bichanich

Research output: Contribution to journalArticlepeer-review


The amplitude, frequency, and Fresnel number dependence of the time-dependent oscillations which were predicted to occur on lines whose saturated gain does not fill the unstable resonator were measured. The time-dependent oscillations had a period of ˜40 nsec independent of flow rates, do not occur for Fresnel numbers less than a demarcation Fresnel number which lies between 1.5 and 3.0, and their amplitudes increased as the fraction of the resonator filled by the saturated gain of the oscillating line decreased. The period of the time-dependent oscillations was determined by the resonator magnification. There was a strong cascade coupling between the oscillating 2 →1 and 1→0 lines. The a priori prediction of these characteristics of the time-dependent oscillations by the MN0R03UR computer model was in agreement with the data. A 7-nsec oscillation, which was probably a mode beat of the laser, was superimposed on top of the 40-nsec oscillation. The time-dependent oscillations occurred in both 2-D and 3-D unstable resonators.

Original languageEnglish (US)
Pages (from-to)1985-3609
Number of pages1625
JournalApplied Optics
Issue number21
StatePublished - Nov 1985

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


Dive into the research topics of 'Time-dependent oscillations in a cw chemical laser unstable resonator'. Together they form a unique fingerprint.

Cite this