The unique RF-1501 optical design provides exceptional sensitivity in an incredibly compact instrument. The bright optical system and noise suppression digital filter allow for high sensitivity measurement. You get a signal-to-noise ratio greater than 300 for the Raman lines of distilled water. The scanning speed is selectable in 4 steps, the fastest being 3,700 nm/min. And wavelength slewing is possible at ultrahigh speeds reaching 30,000 nm/min. Light source: Xenon lamp, 150W, Ozone resolving type lamp housing. Excitation/emission monochromators: Concave, non-aberration, blazed holographic grating, F/2.4, 900 grooves/mm. Wavelength scale: 220 ~ 900 nm and 0 order. Measuring wavelength range: 220 ~ 750nm and 0 order as standard, 220 ~ 900nm and 0 order optionally.