FAR INFRARED SPECTROMETER FOR MEASUREMENTS OF THE SYNCHROTRON RADIATION FROM A HOT ELECTRON PLASMA.
Abstract
A far-infrared spectromenter is constructed to measure the synchrotron radiation from a hot-electron plasma in the wavelength range between 0.1 and 4 mm. The echelette grating theory is reviewed, and the relevant formulae are derived. Utilizing the corrected Rowland's formula for the intensity distribution in various orders, the intensity distribution in the first and second order is calculated. Methods of filtering unwanted frequencies are described. A rather novel method, incorporating phase-space concepts, is used to design the spectrometer. Measurements of spectrometer transmission losses are presented, including losses of individual elements such as light pipes, right-angle bends, and quartz windows. Experimental determination of the filtering characteristics of echelette grating filters, NaCl transmission filters, and wire mesh reflection and transmission filters are given and their effectiveness compared. Theory and experiment are compared for the grating filters. The spectrometer is used to check the linearity of an InSb photodetector over approximately a two-decade power range. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 29, 1966
- Accession Number
- AD0635226
Entities
People
- A. J. Lichtenberg
- S. Sesnic
Organizations
- University of California, Berkeley