Abstract

We demonstrate a method of cascading multiple diffractive elements for improving the purity of spectral dispersion. The cross-axis cascade was implemented in a two-stage grating spectrograph, resulting in a hundredfold reduction of stray light and a high dynamic range up to $-75\mathrm{dB}$. The technique can be used for parallel spectral measurements and processing.

© 2008 Optical Society of America

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