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Mechanism of femtosecond laser ablation revealed by THz emission spectroscopy
Shuntaro Tani, Yohei Kobayashi
We investigated femtosecond laser ablation dynamics using THz time-domain spectroscopy. To clarify the breakdown dynamics of materials, we focused on the motion of charged particle…
Jitter correction for asynchronous optical sampling terahertz spectroscopy using free-running pulsed lasers
Mayuri Nakagawa, Natsuki Kanda, Toshio Otsu +3
We demonstrate a jitter correction method for asynchronous optical sampling (ASOPS) terahertz (THz) time-domain spectroscopy using two free-running oscillators. This method simulta…
Coherent control of acoustic phonons in a silica fiber using a multi-GHz optical frequency comb
Mamoru Endo, Shota Kimura, Shuntaro Tani +1
Multi-gigahertz mechanical vibrations stemming from interactions between light fields and matter, also known as acoustic phonons, have long been a subject of study. In recent years…
A bidirectional dual-comb ring laser for simple and robust dual-comb spectroscopy
Takuro Ideguchi, Tasuku Nakamura, Yohei Kobayashi +1
Fourier-transform spectroscopy is an indispensable tool for analyzing chemical samples in scientific research as well as chemical and pharmaceutical industries. Recently, its measu…
The Impact of Dispersion on Amplitude and Frequency Noise in a Yb-fiber Laser Comb
Lora Nugent-Glandorf, Todd A. Johnson, Yohei Kobayashi +1
We describe a Yb-fiber based laser comb, with a focus on the relationship between net-cavity dispersion and the frequency noise on the comb. While tuning the net cavity dispersion…
Cavity-enhanced dual-comb spectroscopy
Birgitta Bernhardt, Akira Ozawa, Patrick Jacquet +7
The sensitivity of molecular fingerprinting is dramatically improved when placing the absorbing sample in a high-finesse optical cavity, thanks to the large increase of the effecti…