 |
Model 608 Fastie-Ebert Prism Monochromator for Order Sorting and Bandpass Selection It is easy to make your single monochromator a double! |
The Model 608 Prism Predisperser is a small prism monochromator that may be used with many McPherson UV-Vis-IR scanning monochromators. Throughout its range (185 to 2600-nm), it eliminates multiple order effects and reduces stray light by narrowing the bandwidth of broad sources used for monochromator illumination.
The Model 608 Prism Predisperser mounts directly to the entrance slit assembly of our larger grating monochromaotrs. Efficient optical coupling between the predisperser and the monochromator is achieved by using the entrance slit of the monochromator as the exit slit of the predisperser. The predisperser is scanned through the wavelength range by a precision cam that provides linear wavelength change with a uniform rotation drive shaft. Using the optional connecting shaft, the drive can be coupled directly to the monochromator wavelength drive for synchronized scanning throughout the wavelength range of the predisperser.
The predisperser employs a 500-micron fixed width entrance slit, a fused silica prism, a 6-inch focal length collimating and focusing mirror and diverting mirrors. A wavelength counter that indicates wavelength in nanometers is also provided.
For users interested in the prism instruments lack of multiple orders and index of refraction properties (high resolution in the UV and low disperison for broad range coverage in the IR - again, with no multiple orders - consider our Model 303. The Model 303 is better suited to operation as a stand alone monochromator or spectrograph.
PDF format Data Sheet for the prism monochromators, Models 608 and 303 available here
Specifications
The variation of Dispersion due to Refractive Index
across the working range of the Prism Predisperser
