Event
【GIR Open Semiar】Dr. Li Hua / Shanghai Institute of Microsystem and Information Technology, CAS (China)
| Date | 2024.3.19 (16：00 - 17：00) |
|---|---|
| Venue |
Lecture Room 1321, 2Fl., Building 13 Koganei Campus, TUAT Meeting ID:813 3914 6141 Passcode:221431 |
| Speaker | Dr. Li Hua |
| Affiliation | Shanghai Institute of Microsystem and Information Technology, CAS (China) |
| Title | "Hybrid Locking of Terahertz Quantum Cascade Laser Dual-Comb Sources" ＜Abstract＞ 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. |
| Language | English |
| Intended for | Everyone is welcome to join. |
| Co-Organized by | Institute of Global Innovation Research "LIFE SCIENCE" Umebayashi Team Excellent Leader Development for Super Smart Society by New Industry Creation and Diversity |
| Contact | Institute of Global Innovation Research, Institute of Engineering Assoc. Prof. Ya Zhang Email: zhangya(at)go.tuat.ac.jp |
| Remarks | This seminar will be held both face-to-face and online concurrently. |
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