High-Repetition-Rate Terahertz Generation in QPM GaAs With a Compact Efficient 2-μm KTP OPO

Jialin Mei, Kai Zhong, Maorong Wang, Pengxiang Liu, Degang Xu, Yuye Wang, Wei Shi, Jianquan Yao, Robert A. Norwood, Nasser Peyghambarian

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


An efficient tunable high-repetition-rate KTiOPO4 (KTP) optical parametric oscillator (OPO) was deployed as a compact terahertz (THz) source for the first time. The KTP OPO was intracavity pumped by an acousto-optical Q-switched Nd:YVO4 laser and emitted two tunable wavelengths near degeneracy. The OPO tuning range extended continuously from 2.068 to 2.191 μm with a maximum output power of 3.29 W at 24 kHz, corresponding to an optical-optical conversion efficiency of 20.69%, believed to be among the highest reported. A periodically inverted quasi-phase-matched GaAs crystal was used to generate the THz wave by the difference frequency generation (DFG) method based on a dual-wavelength laser. The maximum output THz power was 0.6 μW at 1.244 THz, and the DFG energy conversion efficiency was 4.32 × 10-7. This provides a potential practical palm-top tunable THz sources for portable applications.

Original languageEnglish (US)
Article number7457629
Pages (from-to)1501-1504
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number14
StatePublished - Jul 15 2016


  • difference frequency generation (DFG)
  • gallium arsenide (GaAs)
  • gallium arsenide (GaAs)
  • optical parametric oscillator (OPO)
  • quasi-phase-matching (QPM)
  • terahertz (THz)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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