Nikitin Pavel A, Gerasimov Vasily V, Khasanov Ildus S
Scientific and Technological Centre of Unique Instrumentation RAS, 117342 Moscow, Russia.
Department of Physics, Novosibirsk State University, 630090 Novosibirsk, Russia.
Materials (Basel). 2021 Sep 23;14(19):5519. doi: 10.3390/ma14195519.
The acousto-optic (AO) diffraction of terahertz (THz) radiation in liquefied sulfur hexafluoride (SF6) was investigated in various temperature regimes. It was found that with the increase in the temperature from +10 to +23 °C, the efficiency of the AO diffraction became one order higher at the same amplitude of the driving electrical signal. At the same time, the efficiency of the AO diffraction per 1 W of the sound power as well as the angular bandwidth of the efficient AO interaction were temperature independent within the measurement error. Increase of the resonant sound frequency with decreasing temperature and strong narrowing of the sound frequency bandwidth of the efficient AO interaction were detected.
研究了太赫兹（THz）辐射在液化六氟化硫（SF6）中的声光（AO）衍射在不同温度范围内的情况。发现随着温度从 +10℃升高到 +23℃，在驱动电信号幅度相同的情况下，AO 衍射效率提高了一个数量级。同时，在测量误差范围内，每 1W 声功率的 AO 衍射效率以及有效 AO 相互作用的角带宽与温度无关。检测到共振声频率随温度降低而增加，且有效 AO 相互作用的声频率带宽显著变窄。
