This coupling tube connects the Model 200-1K arc lamp housing to the Model FH-AC air-cooled dual filter holder box. Its length is designed specifically to place the air-cooled filter holder with 2" diameter filters in the converging beam of the light source. A mating flange connects this input extension coupling tube with the Model 200-1K arc lamp housing.
 
Air Cooling Capability:
This air cooled filter holder was originally designed to filter extended range IR light from a 1KW Xenon arc lamp before it enters a monochromator. A 0° extended spectral range hot mirror was used, such that the IR light would be reflected back into the light source. The air cool fan was powerful enough to prevent the hot mirror from cracking even after days of continuous use.
 
2" Diameter Filters:
With this option, the FH-AC air-cooled filter holder should use only 2" diameter filters.