Observation of the operating mode in Raman free-electron lasers

Lifen Zhang; Zaitong Lu; Bibo Feng

doi:10.1117/12.177520

1 September 1994 Observation of the operating mode in Raman free-electron lasers

Lifen Zhang, Zaitong Lu, Bibo Feng

Author Affiliations +

Optical Engineering, Vol. 33, Issue 9, (September 1994). https://doi.org/10.1117/12.177520

Abstract

The method of microwave-induced gas breakdown to diagnose the operating mode structure in a nanosecond-pulse high-power Raman free-electron laser is presented. Modes of low azimuthal and radial index, such as TE₁₁ or TM₀₁, are observed in the Raman free-electron laser experiments. Occasionally, some mixed-mode photographs of the output wave are also obtained, such as the sum of modes TE₁₁ and TE₀₁. In the region of gyroresonance and higher β1, modes with the high index of the electron cyclotron maser are obtained; combined low- and high-index modes are also observed within the same experimental parameters. The results of experimental operating mode observation are discussed and a prediction of mode analysis is made.

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Lifen Zhang, Zaitong Lu, and Bibo Feng "Observation of the operating mode in Raman free-electron lasers," Optical Engineering 33(9), (1 September 1994). https://doi.org/10.1117/12.177520

Published: 1 September 1994

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