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<p>In this paper, we present the lowest phase noise of a continuously tunable terahertz oscillator reported so far. The terahertz wave is generated using the concept known as photomixing. Two slightly detuned diode lasers are superimposed in a fiber-combiner to create an optical beat signal that oscillates at the desired terahertz frequency. An ultrafast PIN photodiode converts the optical beat signal into a terahertz wave that is radiated into free space. To achieve extremely low phase noise, the two diode lasers are locked to a single frequency-comb based on a mode-locked femtosecond laser. The carrier-envelope-offset frequency and the repetition rate of the frequency-comb are compensated and well stabilized, respectively. We measure the phase noise at 500&#xa0;GHz using a dedicated electronic cross-correlation detection scheme. The results are compared to a state-of-the-art commercially available electronic signal generator.</p>

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Continuously Tunable Ultra-Broadband Low-Phase Noise Photonic Terahertz Oscillator

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月27日

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  • S. Mueller,
  • T. Puppe,
  • T. Noack,
  • N. Riedmann,
  • M. Aigle,
  • G. Hechtfischer,
  • N. Vieweg

摘要

In this paper, we present the lowest phase noise of a continuously tunable terahertz oscillator reported so far. The terahertz wave is generated using the concept known as photomixing. Two slightly detuned diode lasers are superimposed in a fiber-combiner to create an optical beat signal that oscillates at the desired terahertz frequency. An ultrafast PIN photodiode converts the optical beat signal into a terahertz wave that is radiated into free space. To achieve extremely low phase noise, the two diode lasers are locked to a single frequency-comb based on a mode-locked femtosecond laser. The carrier-envelope-offset frequency and the repetition rate of the frequency-comb are compensated and well stabilized, respectively. We measure the phase noise at 500 GHz using a dedicated electronic cross-correlation detection scheme. The results are compared to a state-of-the-art commercially available electronic signal generator.