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We present a high sensitivity single-monochromator Raman spectrometer whichallows operation with a tunable laser source. The instrument is based on themodification of a commercial Raman spectrometer; such instruments operate withholographic Rayleigh filters which also act as a laser mirrors and are usuallyconsidered as inherently narrow-band. In our design, the two tasks areseparated and the filter can be freely rotated without much effect on the lightalignment. Since rotation shifts the filter passband, this modification allowstunable operation with efficient stray light filtering down to 150 1/cm. Thedesign is optimized for single-wall carbon nanotubes, for which the performanceis demonstrated using a tunable dye-laser source. The spectrometer thuscombines the high sensitivity with the broadband characteristics of usualtriple monochromator systems.

A broadband and high throughput single-monochromator Raman spectrometer; application for single-wall carbon nanotubes