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<p>This paper presents a high-speed photonic continuous wave phase sensitive radar system operating at 1&#xa0;THz with a measurement rate of 20&#xa0;kHz and micrometer precision. The system utilizes a monolithic dual-mode distributed feedback laser with a Y-shaped cavity, featuring rapid individual tunability of the modes via current modulation. This design generates a narrowband frequency-modulated beat signal for phase sampling, while additionally featuring a high potential for photonic integration. The laser’s wavelength modulation dynamics are thoroughly analyzed, and the THz radar system performance is characterized using a reflection target mounted on a motorized stage. The system achieves a precision of 2.6&#xa0;cm for absolute positioning and 0.88&#xa0;<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\upmu \)</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="normal">μ</mi> </math></EquationSource> </InlineEquation>m for relative position changes with a measurement rate of 20&#xa0;kHz. The high measurement rate and micrometer precision are demonstrated in a possible field of application by sampling the position of a small metal plate mounted on a loudspeaker membrane playing up to 1&#xa0;kHz of acoustic frequencies, while this target is concealed behind an optically opaque barrier.</p>

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High-Speed 1 THz Photonic Continuous Wave Phase-Sensitive Radar with Micrometer Precision

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月22日

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  • Niklas Schulz,
  • Vladyslav Cherniak,
  • Marcel Grzeslo,
  • Lisa C. Kreuzer,
  • Carsten Brenner,
  • Andreas Stöhr,
  • Jan C. Balzer,
  • Martin R. Hofmann

摘要

This paper presents a high-speed photonic continuous wave phase sensitive radar system operating at 1 THz with a measurement rate of 20 kHz and micrometer precision. The system utilizes a monolithic dual-mode distributed feedback laser with a Y-shaped cavity, featuring rapid individual tunability of the modes via current modulation. This design generates a narrowband frequency-modulated beat signal for phase sampling, while additionally featuring a high potential for photonic integration. The laser’s wavelength modulation dynamics are thoroughly analyzed, and the THz radar system performance is characterized using a reflection target mounted on a motorized stage. The system achieves a precision of 2.6 cm for absolute positioning and 0.88  \(\upmu \) μ m for relative position changes with a measurement rate of 20 kHz. The high measurement rate and micrometer precision are demonstrated in a possible field of application by sampling the position of a small metal plate mounted on a loudspeaker membrane playing up to 1 kHz of acoustic frequencies, while this target is concealed behind an optically opaque barrier.