Heterodyne detectors for 30-300um

M. F. Kimmitt

doi:10.1117/12.2297945

1 October 1991 Heterodyne detectors for 30-300μm

M. F. Kimmitt

Proceedings Volume 1576, 16th International Conference on Infrared and Millimeter Waves; 15766G (1991) https://doi.org/10.1117/12.2297945
Event: 16th International Conference on Infrared and Millimeter Waves, 1991, Lausanne, Switzerland

Abstract

Heterodyne spectroscopy can achieve resolving powers of more than 10⁶ in the far-infrared spectral region. However, in the range 30-300μm (10-1THz), there are problems with both detectors and local oscillator (LO) sources. At longer wavelengths GaAs Schottky barrier diodes have been employed with great success, using optically-pumped far-infrared lasers (OPFIRLS), carcinotrons or harmonic generation from millimetre wave sources as LOs. Superconductor-Insulator-Superconductor (SIS) mixers, which require much less LO power than Schottky diodes, are excellent devices at wavelengths longer than 600μm. A great advantage of all rectifying detectors is the very large intermediate frequency (IF) bandwidth available. Typically this might be ±20GHz, allowing spectroscopy over a useful wavelength range (eg ∆λ = 12μm at 300μm) even with fixed frequency LOs.

Citation Download Citation

M. F. Kimmitt "Heterodyne detectors for 30-300μm", Proc. SPIE 1576, 16th International Conference on Infrared and Millimeter Waves, 15766G (1 October 1991); https://doi.org/10.1117/12.2297945

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