Hanna, D.C., Koo, Y-W.J. and Pratt, D.J.
A simple technique for improved performance of intracavity Fabry-Perot frequency selectors
Optics Communications, 44, (3), . (doi:10.1016/0030-4018(83)90198-0).
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By placing an intracavity Fabry-Perot transmission etalon between quarter-wave plates it is possible to operate it at normal incidence without spurious oscillation due to reflections from the etalon. The insertion loss and reduced finesse associated with a tilted etalon are thereby avoided. This technique will allow the use of longer etalons thus allowing much greater mode selectivity.
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