Af. Krupnov et al., Technique of broadband measurements of frequency conversion efficiency foreach harmonique in frequency multipliers up to terahertz range, INT J INFRA, 21(3), 2000, pp. 343-354
Citations number
17
Categorie Soggetti
Eletrical & Eletronics Engineeing
Journal title
INTERNATIONAL JOURNAL OF INFRARED AND MILLIMETER WAVES
The paper describes technique of quantitative analysis of a millimeter-and
submillimeter-wave range multipliers performance in particular the measurem
ent of the frequency conversion efficiency. The output power on each harmon
ic produced by the multiplier can be measured separately without any change
s in the setup even in the case of simultaneous emission of all harmonics i
ncluding the fundamental in a frequency range up to 1 THz and well above.
The measuring technique primarily developed for high resolution microwave s
pectroscopy is based on absorption of radiation in spectral lines of rarefi
ed sample gas and photo - acoustic method of the absorption detection. Sens
itivity independence of the detection method on frequency and well known sp
ectral parameters of the lines provide the technique with broadbandness, hi
gh spectral resolution and power measurement reliability. Principal limits
of measurable radiation power may vary from nanoWatts up to hundreds of Wat
ts. The technique permits real time operation convenient, e.g., for multipl
ier tuning. Practical examples include measurements of harmonic generation
efficiency of multipliers of 78-118 GHz fundamental frequency range, and po
wer measurement up to 6-th harmonic of 230 GHz fundamental radiation of pha
se locked Backward Wave Oscillator (BWO).