[en] The solar brightness temperature was measured in the spectral region between 180 μm and 500 μm wavelength with a balloon-borne lamellar-grating interferometer. The result is in good agreement with the HSRA-model

[en] Recently developed high-power submillimeter lasers offer new possibilities for fundamental studies of laser-plasma and laser-solid interactions and may also be very useful in tokamak plasma diagnostics

[en] Radiation emitted by Nb-Nb point contact Josephson junctions at frequencies up to 30 cm^-1 was studied. Spectroscopic measurements on solids were made using this source

[en] An experiment is described in which the emission from a tokamak plasma in the region of the electron cyclotron frequency and its low harmonics (up to the sixth) is measured. The results are compared with the predictions of the theory of cyclotron emission

[en] A Josephson junction 1.6 mm wavelength microwave source has been used to demonstrate the parametric amplification by reflection necessary to maintain parametric oscillations at 1.6 mm wavelength. A perturbation calculation based on the resistively and capacitively shunted Josephson junction model gives a negative effective microwave resistance for a junction biased at voltages higher than the voltage for a cavity induced step. The parametric oscillation was observed at voltages consistent with the region in which negative resistance was calculated

[en] Heterodyne detection with a point contact Josephson junction was investigated both experimentally and theoretically. From results at 36 GHz, a potentially impressive performance for these devices at submillimeter wavelengths can be extrapolated

[en] The ALCATOR electron density (10¹³ less than n less than 10¹⁴ cm^-3) has been measured with a 337 μ Mach--Zender interferometer. A detailed description of the interferometer is given. Results are discussed and compared with microwave interferometry data

[en] The sky temperature has been measured through the 7 to 10 cm^-1 atmospheric window from the Alpine station of Testa Grigia (3500 m.a.s.l.). An upper limit of 2.7⁰K has been found

[en] A wire mesh Fabry--Perot interferometer with millisecond response time has been constructed. The application of this instrument to study the millimeter and submillimeter synchrotron radiation emitted by magnetically confined Tokamak plasmas is discussed

[en] Coherent HCN-laser scattering can be used as a diagnostic for waves and fluctuations in Tokamak- and Stellarator-type plasmas. Conditions for measuring the scattered light and a resulting heterodyne detection system are described