イベント情報
【GIR公開セミナー】 Dr. Li Hua / Shanghai Institute of Microsystem and Information Technology, CAS (中国)
| 日時 | 2024.3.19（16：00～17：00） |
|---|---|
| 会場 |
東京農工大学 小金井キャンパス 13号館 2階 L1321大講義室 ミーティングID：813 3914 6141 パスコード：221431 |
| 講演者 | Dr. Li Hua |
| 所属機関 | Shanghai Institute of Microsystem and Information Technology, CAS （中国） |
| 講演タイトル | "Hybrid Locking of Terahertz Quantum Cascade Laser Dual-Comb Sources" ＜要旨＞ Frequency combs show various application potentials in high precision spectroscopy, imaging, communications, and so on. In the terahertz (THz) region, semiconductor-based quantum cascade lasers (QCLs) are good candidates for frequency comb and dual-comb operations. THz dual-comb sources can be obtained by beating two THz QCL combs with a slight difference in repetition frequencies. A free-running THz dual-comb source normally shows relatively large phase noise, which strongly hinders its high precision applications. Different approaches, e.g., digital algorithms, active phase locking of one dual-comb line, self-reference technique, etc., have been already employed to stabilize THz dual-comb sources. Up to now, a complete locking of a THz dual-comb source using hardware locking elements has never been demonstrated. Here, we propose hybrid locking method to simultaneously stabilize both dual-comb offset and repetition frequencies of a THz QCL dual-comb source. Experimental results demonstrate that the stability of all dual-comb lines is improved significantly when the proposed hybrid locking is applied onto the dual-comb source. Under the hybrid condition, the measured "maxhold" dual-comb linewidth can reach a record of 5.7 kHz. Furthermore, the recorded time trace of the dual-comb signal shows pulse-like behavior during a large time scale of 100 μs, which verifies that the proposed method functions well for an active locking of a THz QCL dual-comb source. |
| 言語 | 英語 |
| 対象 | どなたでも、ご参加いただけます。 |
| 共催 | グローバルイノベーション研究院 ライフサイエンス分野 梅林チーム 卓越大学院プログラム |
| お問い合わせ窓口 | グローバルイノベーション研究院・工学研究院 張 亜 e-mail: zhangya（ここに@ を入れてください）go.tuat.ac.jp |
| 備考 | 本セミナーは、オンライン・対面型の同時開催となります。 |
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