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Integrated transmission-reflection strong-field terahertz time-domain spectroscopy.
Jianghao Li1,2, Aojie Xu1, Deyin Kong2,3
1Hangzhou International Innovation Institute, Beihang University, Hangzhou 311115, China.
Iscience
|January 5, 2026
Summary
We developed a cost-effective strong-field terahertz time-domain spectroscopy (THz-TDS) system using an Yb-doped laser. This advanced THz-TDS offers high performance for material testing and quantum research applications.
Area of Science:
- Optics and Photonics
- Condensed Matter Physics
- Materials Science
Background:
- Strong-field terahertz time-domain spectroscopy (THz-TDS) is crucial for material analysis and quantum research.
- Existing THz-TDS systems face limitations in source performance and cost.
- Advancements are needed for broader applications in non-equilibrium physics and biomedical research.
Purpose of the Study:
- To present a novel high-repetition-rate integrated transmission-reflection strong-field THz-TDS system.
- To demonstrate a cost-effective and high-performance alternative to current THz-TDS technologies.
- To enable advanced nonlinear excitation and strong-field spectroscopy.
Main Methods:
- Utilized an industrial Yb-doped femtosecond laser (1,030 nm) for driving the THz-TDS system.
- Achieved tunable repetition rates from 1-50 kHz.
- Integrated both transmission and reflection modes for comprehensive material analysis.
Main Results:
- Obtained 1.14 μJ single-pulse THz energy with a focal peak field exceeding 403 kV/cm.
- Reached 43 mW average power at 50 kHz repetition rate.
- Demonstrated a signal-to-noise ratio (SNR) of approximately 60 dB in both modes.
- Successfully profiled silicon wafer thickness and tested THz field-sensitive metasurfaces.
Conclusions:
- The developed THz-TDS system offers comparable THz fields to Ti:sapphire systems at a lower cost.
- Features higher average power and faster measurement potential.
- Promotes broader practical applications in material science, quantum manipulation, and biomedical research.
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