Articles you may be interested inMicrowave power absorption of magnetic composites filled with surface coated Fe-Al-Si flakes J. Appl. Phys. 115, 17A503 (2014); 10.1063/1.4859015Laser-pumped paraffin-coated cell rubidium frequency standard

For mixing in a Josephson junction at infrared frequencies, we have shown that the available power from the junction increases as the intermediate frequency is increased. Following this result an infrared receiver has been developed incorporating a 9-GHz maser preamplifier at the i.f. Using this system, the beat between the 401st harmonic of a high-quality microwave source and a 3.8-THz infrared laser has been observed. Also, for low-order mixing at 3.8 THz, a comparison of beat signals from a Josephson junction and a room-temperature mixer has been made.

Frequency measurements versus microwave power (P,x), lamp temperature (TL), and cell temperature (T,) have been made on a passive Rb87 frequency standard. The lamp and integrated cell, upon which the measurements were made, are typical of the majority of the commercial rubidium standards in the field. This is the first report of the frequency dependence upon PVh.

Simultaneous irradiation of a Josephson junction with ≈ 10 GHz microwave power and 891-GHz laser radiation produces a 60-MHz beat between the fundamental laser frequency and harmonics of the klystron, ranging from the 84th to the 100th as the klystron is tuned. Observation of such high-order harmonic mixing of klystron and laser signals is unprecedented.

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