[18p-E206-1~12] 3.9 Terahertz technologies

[18p-E206-12] Terahertz Differential Absorption Measurement Using Spectral Bifurcated Laser

〇Yuma Takida¹, Toshiyuki Ikeo², Kouji Nawata¹, Yoshio Wada², Yasuhiro Higashi², Hiroaki Minamide¹ (1.RIKEN, 2.Ricoh Co.)

Keywords:THz, Differential absorption measurement, Gas sensing

Using spectral multi-furcated oscillations in a passively Q-switched sub-nanosecond microchip laser, we have demonstrated frequency-domain differential absorption measurement in the terahertz (THz) frequency region. By precisely tuning one of the THz-wave frequencies to a gas absorption line, the multi-furcated THz-wave pulses enable us to measure differential absorption signals every 20 ms without any active frequency modulation.