Fabrication of CaO & Fe2O3 Disks to Attenuate and Filtrate Some Visible and Infrared Wavelengths

Abstract

In this work some optical attenuators and filters for some wavelengths in the visible and infrared regions of the electromagnetic spectrum were designed and fabricated. The selected materials in this work were Calcium Oxide and Iron (III) Oxide. By pressing each of those materials with Potassium Bromide using a classic pressing machine, different disks were produced. Two groups of disks were produced: group with different thickness of the CaO. And group two with different thickness of Fe 2O3. The produced disks were rigid enough to be dealt with. Using a photodetector accompanied with digital multimeter, the incident and transmitted laser intensity for each disk were recorded and plotted. The absorption coefficient and the transmission spectrum were determined for the wavelengths: [(532), (632.8), (675), (810), (820), (940) and (1064)] nm. The results showed that the CaO disks can be used as a filter for the wavelength 810 nm. Also the Fe2O3 disks can be used as good monochromatic filters for the wavelength 1064 nm and as attenuators for the wavelengths 532nm and 632.8 nm.