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<p>We report the generation of extremely narrowband, micro-Joule-level, frequency-tunable THz pulses between 3 and 4 THz in organic DSTMS, without applying any spectral filtering techniques (e.g., bandpass filters). Using difference frequency generation with &gt; 10&#xa0;ps duration linearly chirped near-infrared (NIR) pulses, THz pulses with 300 nJ output energy and an extremely narrow spectrum of 83&#xa0;GHz at 3.87 THz were achieved with a relative bandwidth of 2%. Producing table-top picosecond THz pulses with such intensity and an extremely narrow spectrum has been quite challenging in the entire THz gap frequency range (3–15 THz), previously hindered by technical barriers such as low-energy excitation and insufficient pulse stretching of the NIR pulses. We showcased the experimental procedure of minimizing the THz spectrum bandwidth and systematically explored the THz pulse energy and relative bandwidth versus different NIR chirping conditions, aiming to offer practical guidance in preparing tailored THz pulses for different scientific cases. The tunability of the central frequency and spectral bandwidth can both be potentially extended by varying the NIR wavelengths and durations. Our ultra-narrowband THz source will open up new possibilities for controlling quantum states requiring extremely high selectivity, particularly in the applications for quantum information processing by coherently manipulating the Rydberg states in semiconductors, which are currently only possible at free-electron lasers.</p>

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Ultra-narrowband Coherent THz Source by Chirped-Pulse Difference Frequency Generation

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月13日

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  • Peng Han,
  • Guy Matmon,
  • Steven L. Johnson,
  • Biaolong Liu

摘要

We report the generation of extremely narrowband, micro-Joule-level, frequency-tunable THz pulses between 3 and 4 THz in organic DSTMS, without applying any spectral filtering techniques (e.g., bandpass filters). Using difference frequency generation with > 10 ps duration linearly chirped near-infrared (NIR) pulses, THz pulses with 300 nJ output energy and an extremely narrow spectrum of 83 GHz at 3.87 THz were achieved with a relative bandwidth of 2%. Producing table-top picosecond THz pulses with such intensity and an extremely narrow spectrum has been quite challenging in the entire THz gap frequency range (3–15 THz), previously hindered by technical barriers such as low-energy excitation and insufficient pulse stretching of the NIR pulses. We showcased the experimental procedure of minimizing the THz spectrum bandwidth and systematically explored the THz pulse energy and relative bandwidth versus different NIR chirping conditions, aiming to offer practical guidance in preparing tailored THz pulses for different scientific cases. The tunability of the central frequency and spectral bandwidth can both be potentially extended by varying the NIR wavelengths and durations. Our ultra-narrowband THz source will open up new possibilities for controlling quantum states requiring extremely high selectivity, particularly in the applications for quantum information processing by coherently manipulating the Rydberg states in semiconductors, which are currently only possible at free-electron lasers.