Laser applications and other topics in quantum electronics

Submillimeter backward-wave tube frequency-locked to an HCOOH laser for use in a submillimeter spectrometer

V. F. Zakharyash, V. M. Klementyev, P. A. Losev, B. A. Timchenko, V. V. Yumin


Abstract: The emission frequency of a backward-wave tube (BWT) was locked to the emission frequency of an optically pumped HCOOH laser (λ = 716.157 GHz) characterized by a free-running stability of ~ 10^– 10 in 1 s. The experimental results demonstrated that without recourse to phase locking the spectral width of the emission line of the BWT was ~ 200 kHz, whereas locking to the laser oscillations reduced the emission spectrum to hundreds of hertz. A brief discussion is given of the design of a spectrometer based on the use of phase locking of a BWT to a laser and of a tunable microwave synthesizer. Preliminary results of an investigation of such a system are reported.

UDC: 621.373.826.038.823

PACS: 42.55.Lt, 42.60.By, 42.60.Jf, 42.60.Fc, 42.60.Lh, 84.40.Fe

Received: 12.10.1988

 English version: Soviet Journal of Quantum Electronics, 1989, 19:7, 977–978

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