The SP1 from Clifton Photonics is a Portable Raman Spectrometer that has a spectral range of up to 4000 cm^-1. It has a bandwidth range from 532 nm to 676 nm and has optional design wavelengths for visible and near-infrared wavelengths of up to 830 nm. This spectrometer has a nominal focal length of 75 mm and numerical aperture (NA) of up to 0.3 (dependent on the input fiber' NA). It uses a 50 x 50 mm fixed holographic grating with a grating line density of 1800 lines/mm. This spectrometer has a nominal peak width of 12 cm^-1 (for a 62.5 µm core fiber) and 17 cm^-1 (for a 105 µm core fiber) at FWHM.

The SP1 provides custom input stages incorporating conventional slits or inline filtering such as long wavelength pass filters for Raman spectroscopy. It is designed for use with a fiber optic coupled input source and in its standard form, the fiber is coupled directly to the spectrometer with the fiber core forming the entrance aperture. The NA of this spectrometer exceeds that of typical optical fibers producing the most efficient collection possible. The low aberration optical design allows for multiple fibers to be coupled and analyzed individually on suitable cameras. This spectrometer features a low stray light design and is ideal for Raman spectroscopy applications.