The Commander from McPherson is an f/4.8 triple spectrometer for the UV and wide wavelength range Raman applications. As a triple grating spectrometer, it has continuously tuneable wavelength positioning for work with tuneable lasers, to seek resonance or to work where filters are not available, deep in the UV. In the UV, it operates to the edge of the atmospheric transmission envelope at 185 nm thanks to a reflective optical system with master polished optics and UV-enhanced broadband coatings. For experiments that approach the oxygen absorption envelope, purge fittings are provided. A wide selection of diffraction gratings and cooled (–100°C) CCD detectors ensure sensitivity. Flexible user-controlled configuration of slit width, apertures and gratings control the system bandpass, rejection edge and spectral resolution as needed. The spectrograph stage, with imaging optics optimises flux and enables imaging across a large focal plane. The f/4.8 aperture ratio collects large solid angle and emission from weakly emitting samples and takes advantage of the smaller diffraction-limited spots occurring in the UV. A single stage bypass allows dedicated use of the spectrograph when required.

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