Journal ArticleDOI
Electronic frequency stabilization of microwave oscillators.
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TLDR
Two circuits for use to control the frequency of a microwave oscillator by an external high Q cavity are described, and a technique by which the frequency‐stabilization systems could be used to investigate the structure of microwave absorption spectra is suggested.Abstract:
Two circuits for use to control the frequency of a microwave oscillator by an external high Q cavity are described. One of the circuits uses a microwave equivalent of the frequency discriminator, in conjunction with a d.c. amplifier. The other uses the cavity in a special circuit that provides an intermediate‐frequency signal that is a measure of the difference between the frequencies of the oscillator and cavity. This allows the use of an intermediate‐frequency amplifier. The resulting stability of the oscillators is such that audible beat frequencies can be produced between two oscillators at 10,000 Mc/sec. The resultant signal can be frequency modulated at audiofrequencies, with stabilization acting throughout the modulation cycle. A technique by which the frequency‐stabilization systems could be used to investigate, with high resolution, the structure of microwave absorption spectra is suggested.read more
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Frequency locking to a high-finesse Fabry–Perot cavity of a frequency doubled Nd:YAG laser used as the optical phase modulator
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References
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Journal ArticleDOI
The Absorption of One-Half Centimeter Electromagnetic Waves in Oxygen
TL;DR: In this paper, the absorption of electromagnetic waves in the one-half cm wave-length range has been measured for both pure and mixed mixtures as a function of pressure, and the measured values are in agreement with the theory of Van Vleck both as regards the absolute value of the absorption (which is as great as 67 db/km at the band center for pure mixtures at a pressure of one atmosphere) and the dependence on pressure.