Difference frequency generation of infrared waves in asymmetric quantum wells.There has been a great deal of interest in recent years in the investigation of signals in the terahertz frequency range of the electromagnetic spectrum. One impediment to this ongoing research is the lack of useful sources...
Relating to or being electromagnetic radiation between radio waves and infrared waves in the electromagnetic spectrum, having frequencies between 300 megahertz and 300 gigahertz and wavelengths between 1 meter and 1 millimeter. n. 1.A wave of microwave radiation. ...
infrared, infrared frequency - the infrared region of the electromagnetic spectrum; electromagnetic wave frequencies below the visible range; "they could sense radiation in the infrared" wave number - the reciprocal of the wavelength of a wave attendance - the frequency with which a person is presen...
“On foggy nights my infrared camera on my deck shows orbs darting around in Oregon.” “The evildoers were spraying the skies here in Kentucky yesterday, all day long!” “The skies are blue, but as soon as the next front approaches, here comes the spraying.” “Some days there is ...
The most widely accepted definition of the THz band is that it ranges from about 10 THz to 100 GHz (0.03–3.00 mm in wavelength) and lies between the microwave and infrared (IR) frequency bands. Unlike microwave and IR technologies, THz technologies are not well developed, and there is a...
height. On the other hand, electrons may be removed from negative oxygen ions by visible and near infrared radiation which does reach the 95 km. level prior to sunrise. The problem is then to determine the intensities of the relevant wave lengths at the 95 km. level, and to compute the...
Observations of low-frequency waves in the Ligurian Sea in December 1977 are presented. From time series of thermal infrared images obtained by satellite NOAA 5, the mean wavelength and phase velocity are estimated. They are, respectively, 38 km and 18 cm s1. These waves are analyzed as ...
Submillimeter Technology Laboratory, University of Massachusetts Lowell, 01854, Lowell, Massachusetts E. R. Mueller Rights and permissions Reprints and permissions About this article Cite this article Mueller, E.R. Frequency-shifting submillimeter single-sideband receiver. Int J Infrared Milli Waves 15, ...
Higher energy phonon dispersion curves, along with values for the sound velocities and frequencies of infrared active modes have been predicted, and they are in accord with available experimental data (Sim et al., 1994). Further discussions of the angular dispersion of the phonon frequencies and ...
Application of mid-infrared cavity-ringdown spectroscopy to trace explosives vapor detection using a broadly tunable (6-8 μm) optical parametric oscillator A novel instrument, based on cavity-ringdown spectroscopy (CRDS), has been developed for trace gas detection. The new instrument utilizes a ...