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Optical Engineering

Observation of the operating mode in Raman free-electron lasers
Author(s): Lifen Zhang; Zaitong Lu; Bibo Feng
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Paper 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.

Paper Details

Date Published: 1 September 1994
PDF: 5 pages
Opt. Eng. 33(9) doi: 10.1117/12.177520
Published in: Optical Engineering Volume 33, Issue 9
Show Author Affiliations
Lifen Zhang, Shanghai Institute of Optics and Fine Mechanics (China)
Zaitong Lu, Shanghai Institute of Optics and Fine Mechanics (China)
Bibo Feng, Shanghai Institute of Optics and Fine Mechanics (China)

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