Abstract-Terahertz-wave parametric gain of stimulated polariton scattering

Yuma Takida, Jun-ichi Shikata, Kouji Nawata, Yu Tokizane, Zhengli Han, Mio Koyama, Takashi Notake, Shin’ichiro Hayashi, and Hiroaki Minamide

https://journals.aps.org/pra/accepted/9b07fY8bY8f1004d36744e58e4d414a59136e3566

We have experimentally determined the terahertz (THz)-wave parametric gain of stimulated Raman scattering (SRS) by phonon-polaritons in LiNbO3. Our approach is based on ultra-bright THz-wave generation from SRS under stimulated Brillouin scattering suppression with sub-nanosecond pump pulses. To obtain the frequency dependence of the parametric gain, we measured the crystal-length dependence of the THz-wave output directly using a surface-coupling configuration. We found that the product of the parametric gain and the threshold crystal length is constant throughout the tuning range. Our result provides a physical basis for the design and performance enhancement of SRS-based ultra-bright table-top THzwave sources for various applications.