Littrow quartz spectrograph

Littrow quartz spectrograph

[′li‚trō ¦kwȯrts ′spek·trə‚graf]
(spectroscopy)
A spectrograph in which dispersion is accomplished by a Littrow quartz prism with a rear reflecting surface that reverses the light; a lens in front of the prism acts as both collimator and focusing lens.
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