Heterodyne detection of tunable FIR sidebands
Journal Article
·
· IEEE J. Quant. Electron.; (United States)
Continuously tunable far infrared (FIR) laser sidebands have been generated in a Schottky diode by nonlinear mixing the radiation from an optically pumped FIR laser operating between 0.6 and 3 THz with that from a microwave source in the 2-4 GHz range. A very sensitive heterodyne detection is adapted to detect the sidebands generated not only at the sum or difference frequency of the two radiations, but also, for the first time in the FIR region, those related to the mixing of the FIR radiation with the second and third harmonics of the microwaves. The high selectivity of the superheterodyne detection allows easy separation of the various sidebands. The global tunability of this system is 2 x 10 GHz for the more powerful FIR emission lines. To demonstrate the tunability of the device absorption signals of several molecules are presented in the whole range of operation of the system (0.6-3 THz) using either direct or lock-in detection techniques.
- Research Organization:
- Laboratoire de Spectroscopie Hertzienne, associe au CNRS, Universite de Lille I, 59655 Villeneuve d'Ascq Cedex
- OSTI ID:
- 6093904
- Journal Information:
- IEEE J. Quant. Electron.; (United States), Journal Name: IEEE J. Quant. Electron.; (United States) Vol. QE-23:8; ISSN IEJQA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
EMISSION
EQUIPMENT
FAR INFRARED RADIATION
FREQUENCY MIXING
FREQUENCY RANGE
GHZ RANGE
GHZ RANGE 01-100
HARMONIC GENERATION
HETERODYNE RECEIVERS
INFRARED RADIATION
LASERS
MICROWAVE EQUIPMENT
MICROWAVE RADIATION
NONLINEAR OPTICS
OPTICAL PUMPING
OPTICS
PUMPING
RADIATIONS
RADIO EQUIPMENT
SCHOTTKY BARRIER DIODES
SEMICONDUCTOR DEVICES
SEMICONDUCTOR DIODES
SEMICONDUCTOR LASERS
SENSITIVITY
SIGNALS
TUNING
420300* -- Engineering-- Lasers-- (-1989)
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
EMISSION
EQUIPMENT
FAR INFRARED RADIATION
FREQUENCY MIXING
FREQUENCY RANGE
GHZ RANGE
GHZ RANGE 01-100
HARMONIC GENERATION
HETERODYNE RECEIVERS
INFRARED RADIATION
LASERS
MICROWAVE EQUIPMENT
MICROWAVE RADIATION
NONLINEAR OPTICS
OPTICAL PUMPING
OPTICS
PUMPING
RADIATIONS
RADIO EQUIPMENT
SCHOTTKY BARRIER DIODES
SEMICONDUCTOR DEVICES
SEMICONDUCTOR DIODES
SEMICONDUCTOR LASERS
SENSITIVITY
SIGNALS
TUNING