FIR Laser Modulation by an External Variable Reactance
- 1 December 1980
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Instrumentation and Measurement
- Vol. 29 (4), 277-283
- https://doi.org/10.1109/tim.1980.4314934
Abstract
Fast frequency modulation of an FIR laser by means of an external variable reactance is presented. In particular, the use of the varactor effect in a micrometer-size Schottky-barrier diode and of the electron density modulation in a cold plasma is considered. Experiments carried out on an optically pumped HCOOH line at 403.7 GHz are described and the results are compared with the theory developed. Peak-to-peak frequency deviation Δfpp of about 15 kHz and Q-limited bandwidth have been obtained with the varactor effect, whereas the plasma modulator yielded Δfpp of 6 kHz and a 20-kHz bandwidth.Keywords
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