19th Annual Student Research Conference
Science
Measurement and Analysis of Power Distribution in Diffraction Gratings as a Function of Incidence Angle
Raghav K. Chhetri
Dr. Michael Goggin, Faculty Mentor
The efficiency of a diffraction grating is usually measured in Littrow configuration and in doing so it is assumed that the incident light not diffracted by the first diffraction order is distributed throughout the other orders of diffractions. However, this is not always true and there are conditions for which there is some loss of incident light. In this research, we investigate and measure the incident power that is diffracted in all available diffraction orders as a function of incident angle. The measurements are being carried out in the visible regions of the spectrum for the following diffraction gratings that have 1200 grooves per millimeter: three blazed ruled diffraction gratings, one un-blazed holographic diffraction grating and one blazed holographic diffraction grating. The results would be useful in designing external cavity diode lasers. It might also be of interest to the manufactures making optical instruments that use diffraction gratings.
Keywords: Diffraction Gratings, Grating, Blazed, Holographic, Littrow, Diffraction
Topic(s):Physics
Presentation Type: Oral Paper
Session: 25-4
Location: VH 1416
Time: 10:30