[18p-221B-1~15] 4.6 Terahertz Photonics

▲ [18p-221B-10] Harmonic generation from InSb in the Far Infrared Region

〇(D)Phan ThanhNhat Khoa¹, Kosaku Kato¹, Goro Isoyama², Masashi Yoshimura¹, Shinsuke Fujioka², Makoto Nakajima¹ (1.ILE Osaka Univ., 2.ISIR Osaka Univ.)

Keywords:third hamonic, free electron laser, non-parabolic

Using intense beam with frequency 4 THz from Free Electron Laser to pump the InSb crystal, we obtained strong third harmonic generation (THG) with efficiency up to 4 x 10-4 at room temperature. The THG can originate from the nonlinear third order electric current due to non-parabolicity of the band structure in InSb. InSb yields significantly higher THG signal compared with InAs whose shape of energy band structure is more parabolic.