Presentation Information
[16a-PB4-8]Frequency Stabilization of a Resonant Tunneling Diode Terahertz Oscillatorby Suppressing Optical Feedback and Long-term Frequency Drift
〇(M1)Junta Nagayoshi1, Kento Okaishi1, Yuto Hara1, Hiroshi Ito2, Safumi Suzuki3, Takashi Arikawa1,4 (1.Univ. of Hyogo, 2.Univ. of Tokyo, 3.Science Tokyo, 4.Univ. of Osaka)
Keywords:
Terahertz waves,Resonant Tunneling Diode,Faraday isolator
Resonant tunneling diode (RTD) oscillators have attracted attention as compact terahertz wave sources capable of room-temperature operation and are expected to be applied in various fields. However, several issues remain, including instability in oscillator operation caused by optical feedback from samples and long-term frequency drift.
In this study, we stabilized the oscillation frequency of an RTD oscillator by eliminating optical feedback using an isolator and suppressing frequency drift through PID control based on the voltage-controlled oscillation characteristics of the RTD.
We fabricated a Faraday isolator using ferrite magnets. By inserting the isolator into the optical path between the RTD oscillator and the sample, we investigated whether instability in the source operation caused by optical feedback could be mitigated. Without the isolator, the oscillation frequency changed due to optical feedback from the sample. In contrast, with the isolator inserted, the oscillation frequency remained almost unchanged, confirming that reflected optical feedback from the sample was effectively suppressed.
In this study, we stabilized the oscillation frequency of an RTD oscillator by eliminating optical feedback using an isolator and suppressing frequency drift through PID control based on the voltage-controlled oscillation characteristics of the RTD.
We fabricated a Faraday isolator using ferrite magnets. By inserting the isolator into the optical path between the RTD oscillator and the sample, we investigated whether instability in the source operation caused by optical feedback could be mitigated. Without the isolator, the oscillation frequency changed due to optical feedback from the sample. In contrast, with the isolator inserted, the oscillation frequency remained almost unchanged, confirming that reflected optical feedback from the sample was effectively suppressed.