Abstract: The invention relates to a device (1) for measuring the state of polarization of an incident wave of frequency 10 GHz to 30 THz, comprising a field effect transistor (2), a reception antenna (3). According to the invention, the antenna parts (31, 33) detect a component of polarization of the wave, collinear with a direction (X) causing in the transistor (2) an alternating detection voltage (Us), the parts (32, 33) detect a component of polarization of the wave, collinear with a direction (Y) causing the appearance in the transistor (2) of an alternating detection voltage (Ud), the transistor (2) being designed to generate, as electrical detection signal (?U) between the source terminal (21) and the drain terminal (22), a DC detection voltage (?U) a part of which is determined by the state of elliptical polarization of the wave by interference in the transistor (2) between the alternating voltages (Us, Ud).

Abstract: The invention relates to a device (1) for measuring the state of polarization of an incident wave of frequency 10 GHz to 30 THz, comprising a field effect transistor (2), a reception antenna (3). According to the invention, the antenna parts (31, 33) detect a component of polarization of the wave, collinear with a direction (X) causing in the transistor (2) an alternating detection voltage (Us), the parts (32, 33) detect a component of polarization of the wave, collinear with a direction (Y) causing the appearance in the transistor (2) of an alternating detection voltage (Ud), the transistor (2) being designed to generate, as electrical detection signal (?U) between the source terminal (21) and the drain terminal (22), a DC detection voltage (?U) a part of which is determined by the state of elliptical polarization of the wave by interference in the transistor (2) between the alternating voltages (Us, Ud).

Abstract: A laser device for emitting waves in a frequency range belonging to the terahertz range, includes the following, in combination: a wave guide extending longitudinally along an axis A-A?; a superconducting coil arranged coaxially to the wave guide and arranged at a first end of the wave guide; a p-Ge p-doped germanium crystal arranged inside the coil such that the turns of the superconducting coil at least partially surround the p-Ge crystal; a cooling device containing a coolant, the superconducting coil and the p-Ge crystal being arranged in the cooling device, and the wave guide partially extending outside the cooling device; and removing the coolant from the wave guide.

Abstract: A laser device for emitting waves in a frequency range belonging to the terahertz range, includes the following, in combination: a wave guide extending longitudinally along an axis A-A?; a superconducting coil arranged coaxially to the wave guide and arranged at a first end of the wave guide; a p-Ge p-doped germanium crystal arranged inside the coil such that the turns of the superconducting coil at least partially surround the p-Ge crystal; a cooling device containing a coolant, the superconducting coil and the p-Ge crystal being arranged in the cooling device, and the wave guide partially extending outside the cooling device; and removing the coolant from the wave guide.