14:00 〜 14:30 [E-5-01 (Invited)] Recent advances in terahertz quantum cascade lasers based on difference-frequency generation 〇Kazuue Fujita1、Shohei Hayashi1、Atsushi Nakanishi1 (1.Hamamatsu Photonics) https://doi.org/10.7567/SSDM.2021.E-5-01