Higher-order azimuthal mode unstable resonator

Richard J. Tansey; Victor L. Gamiz; Roger A. Mickish; Dale A. Holmes; David R. Kohler; John L. Martin; E. Pape

doi:10.1117/12.18458

1 June 1990 Higher-order azimuthal mode unstable resonator

Richard J. Tansey, Victor L. Gamiz, Roger A. Mickish, Dale A. Holmes, David R. Kohler, John L. Martin, E. Pape

Proceedings Volume 1224, Optical Resonators; (1990) https://doi.org/10.1117/12.18458
Event: OE/LASE '90, 1990, Los Angeles, CA, United States

Abstract

A pulsed CO2 electric discharge fast flowing gain medium is used to test three unstable resonators which are forced to oscillate in an L = 3 azimuthal mode. This Higher Order Azimuthal Mode Unstable Resonator could be used to form a 'natural mode' resonator which would be unaffected by support struts necessary in an annular gain medium. Six equally spaced intracavity radial struts, and a suitable diameter on-axis obscuration, produce 180 degree phase changes between adjacent sectors of the six-sector near field pattern, and six radial lobes in the far field with no on-axis intensity. A phase plate, constructed by applying a half step coating to every other adjacent sector, corrects the far field.

Citation Download Citation

Richard J. Tansey, Victor L. Gamiz, Roger A. Mickish, Dale A. Holmes, David R. Kohler, John L. Martin, and E. Pape "Higher-order azimuthal mode unstable resonator", Proc. SPIE 1224, Optical Resonators, (1 June 1990); https://doi.org/10.1117/12.18458

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