1/4Mi Bi Monochromator

Features and Applications:

• Connect to a computer via RS232 or IEEE-488 interface. Can control the slit and grating through a manual controller
• Scan in two directions with constant grating resolution
• Raman and fluorescence studies are conducted by reducing scattered light and increasing dispersion, with subtraction mode limiting the broadening of the pulse source to a minimum
• Triple grating can achieve efficient scanning over a wide spectral range
• Paired with SP filter wheel, automatic conversion of filter can be achieved
• Can be set as a monochromator or spectrograph at the factory

This instrument can be set as a dual monochromator in addition or subtraction mode at the factory. In both modes, the two monochromators act as a dual filter to eliminate scattered light, with an effect that is square times that of a monochromator. In additive dispersion mode, M24-D is equivalent to a 1/2-meter monochromator, but can further reduce scattered light. The spectrum propagated by the first grating produces an angular range, which is doubled by the second grating. As a result, the resolution produced by the dual monochromator is twice that of a single quarter meter monochromator. In subtractive dispersion mode, the first monochromator selects bandpass, and the second monochromator removes the time and role dispersion errors caused by the first monochromator.

M24-D provides a method to solve spectral problems from pulse sources. For example, a regular monochromator produces a broadening of approximately 250 picoseconds during the optical path passing through the monochromator. However, through subtractive dispersion mode, M24-D can reduce this broadening almost to zero because the second monochromator compensates for the optical path difference of the first monochromator.