[22p-A602-1~17] 3.7 Optical measurement, instrumentation, and sensor (formerly 3.8)

2:00 PM - 2:15 PM JST(5:00 AM - 5:15 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[22p-A602-5] ASOPS-THz-TDS based on free-running Ti:Sapphire lasers

〇Mayuri Nakagawa¹, Natsuki Kanda^1,2, Hidekazu Nakamae¹, Toshio Otsu¹, Isao Ito¹, Hidefumi Akiyama¹, Yohei Kobayashi¹, Ryusuke Matsunaga¹ (1.ISSP, The Univ. of Tokyo, 2.RAP, RIKEN)

Keywords:

Asynchronous Optical Sampling,frequency comb,terahertz

Asynchronous optical sampling (ASOPS) terahertz time-domain spectroscopy (THz-TDS) realizes high frequency resolution measurement with high scan rate. However, the timing jitter between two pulsed lasers distorts data and could cancel out the THz-waveform among the accumulation; thus sophisticated techniques such as feedback control has been required. In this work, we demonstrate easier ASOPS THz-TDS with free-running Ti:Sapphire lasers using the software jitter correction method that we recently developed. The detection bandwidth and efficiency at a few THz region was significantly improved than our previous result with Yb-based fiber lasers, owing to the narrower pulse width and well-established elements for THz generation and detection. We also improved the robustness to environmental fluctuations. The successful jitter correction using commercially available Ti:Sapphire lasers allows us to have a wide selection of light sources for designing high-resolution high-scan rate THz-TDS.