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Prism-Based Infrared Spectrographs Using Modern-Day Detectors

Volume 61, Number 9 (Sept. 2007) Page 909-915

Keltner, Zachary; Kayima, Katherine; Lanzarotta, Adam; Lavalle, Luis; Canepa, Marina; Dowrey, Anthony E.; Story, Gloria M.; Marcott, Curtis; Sommer, André J.


A comparison of prism-based spectrographs to grating-based spectrographs is made when each of the systems is coupled to a modern-day liquid-nitrogen-cooled photovoltaic array detector. A comparison of the systems is also made using a room-temperature microbolometer array detector. Finally, infrared microspectroscopy of samples whose size is ∼10 micrometers will be demonstrated using a prism spectrograph outfitted with both types of detectors. The results of the study show that prism-based spectrographs offer an economical alternative to grating-based systems when spectral coverage is more critical than spectral resolution. The results also demonstrate that spectra with good signal-to-noise ratios can be collected on any of the systems with a total integration time of 10 seconds or less.