Investigations into the mid-infrared Christiansen effect of the dispersive materials
Abstract
The mid-infrared Christiansen effect was found to occur in the KBr pellets in which powder of the dispersive material α-SiC was dispersed. The KBr pellet technique is commonly used for infrared transmission (or absorption) spectroscopy of powders, and when we dispersed in KBr powder a moderate amount of a dispersive material, such as α-SiC, and pressed them into a pellet, a transmission spectrum with a sharp peak was obtained. The phenomenon is very interesting, and can be explained with the well-known Lorentz dispersion model accurately. Also, it is very useful for making a new type of mid-infrared band-pass filter, e.g. a mid-infrared Christiansen filter. After performing combinations of some other dispersive materials, such as MgO, with some transparent refractive index matching matrices, such as KCl etc, another aspect of the application of this important classical effect is shown, that is, determining the refractive indices of some mid-infrared transparent materials accurately.
- Publication:
-
Infrared Physics and Technology
- Pub Date:
- December 2002
- DOI:
- 10.1016/S1350-4495(01)00136-0
- Bibcode:
- 2002InPhT..43..401L