[20p-E206-1~11] 3.9 Terahertz technologies

[20p-E206-1] Sub-terahertz Nonlinear Quantum-Cascade Laser Source

〇Kazuue Fujita¹, Shohei Hayashi¹, Akio Ito¹, Masahiro Hitaka¹, Tatsuo Dougakiuchi¹ (1.Hamamatsu Photonics)

Keywords:Terahertz, Quantum cascade laser, difference frequency generation

Terahertz quantum cascade laser sources with intra-cavity nonlinear frequency mixing are the first room temperature electrically pumped monolithic semiconductor sources that operate in the 1.2–5.9 THz spectral range. However, low-frequency operation below 2 THz is difficult because converted terahertz waves suffer from significantly high absorption in waveguides. Here we report a sub-terahertz electrically pumped monolithic semiconductor laser. This sub-terahertz source is based on a high-performance, long-wavelength (λ≈14 μm) quantum cascade laser in which high-efficiency terahertz generation occurs. The device produces peak output power of 11 μW within the 611–788 GHz frequency range at room temperature.