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介绍在四厘米波段做成的以无源谐振腔输出的双腔量子放大器振幅和相位稳定性,以及行波量子放大器相位稳定性的研究结果。预计了在量子放大器中能实现的最高振幅和相位稳定度。发现腔式放大器信号相位波动在±0.2°范围内,取决于液氦沸腾的行波量子放大器信号相位波动在±0.4°范围内。在从谐振腔系统排除液氦或将温度降低到氦λ点以下的情况下,波动便会消失。对于腔式放大器,达到的短期相位稳定度在±0.01°区间内,短期振幅稳定度在±0.004dB 区间内。在一小时内,放大器的相位和振幅稳定度分别为±0.09°和±0.025dB。在行波量子放大器中观测了由液氦蒸发决定的单调相移。
The results of the research on the amplitude and phase stability of the dual-cavity quantum amplifier with passive resonant cavity and the phase stability of the traveling-wave quantum amplifier made in the 4cm band are introduced. The highest amplitude and phase stability that can be achieved in a quantum amplifier are predicted. It was found that the signal phase of the cavity amplifier fluctuates within ± 0.2 °, and the signal phase fluctuation of the traveling-wave quantum amplifier depends on the liquid helium boiling within ± 0.4 °. Fluctuations disappear when the liquid helium is removed from the resonator system or the temperature is lowered below the helium λ point. For cavity amplifiers, the short-term phase stability achieved is within the ± 0.01 ° range and the short-term amplitude stability is within the ± 0.004 dB range. Within one hour, the amplifier's phase and amplitude stability were ± 0.09 ° and ± 0.025 dB, respectively. The monomorphic phase shift determined by liquid helium evaporation was observed in a traveling-wave quantum amplifier.