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22 F. J. Duarte
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a
FlGU RE 6 Generalized multiple-prism array in (a) additive configuration and (b) compensating
configuration. (Reproduced with permission from Duarte [2].)
A multipass analysis performed by Duarte and Piper [49] indicates that the
multiple-return-pass dispersion of the multiple-prism grating assembly is given by
where M = M,M,. Thus, the dispersive linewidth following an R number of
return passes is given by
For copper-vapor laser-pumped dispersive dye laser oscillators, the value
of R can be 44 [49]. Although it is well known that multipasses do reduce the
measured laser linewidth [ 1,2,21,50], the exact mechanism by which this
process occurs is not yet completely understood. This is due to the fact that the
