In CARS and other optical processes used for diagnostics the signal of interest generally varies over the parameter range of interest by a magnitude well in excess of the linear dynamic range of typical optical multichannel detectors. To overcome this limitation in applications where rapid temporal fluctuations occur, the signal is generally split and attenuated by external optics creating multiple images of differing intensities on the detector. The strongest nonsaturated image is then used for data analysis. In this paper a simple single-component optical splitter is described which can be placed inside the spectrograph directly in front of the optical multichannel detector. It is simple to align and particularly convenient for spectrographs in which the signal is introduced through fiber optics.

© 1983 Optical Society of America

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