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Outline

Terahertz light having both the transparency of radio wave and the high resolution of light is expected to be used in a wide range of application fields as a light source for various perspective and nondestructive inspections. We are developing THz-QCL (terahertz quantum-cascade laser), which is expected to be a very compact, portable, high power terahertz light source. Through the introduction of a new quantum subband structure and/or nitride semiconductors, THz-QCL aiming for implementation in society is being developed by performing room temperature oscillation and enlarging the operating frequency region which have been impossible so far. By developing the next generation compact terahertz imaging devices, we would like to contribute to the realization of a prosperous society in the near future.

Fields

Optical Devise Engineering, Quantum Electronics, Semiconductor Physics

Keywords

Terahertz, Quantum cascade lasers, Inter-subband transition, Nitride semiconductors lasers, Molecular-beam epitaxy

Subjects

1. Development toward room temperature operation of THz-QCLs
2. Development of watt-class high-power THz-QCLs
3. Development of unexplored-frequency QCL using nitride and oxide semiconductors
4. Development of surface emitting THz-QCL
5. Development of mobile THz-QCL light source for nondestructive inspection

Selected Publications

1. Wang, L., Lin, T. T., Wang, K., and Hirayama, H.:“Clean three-level direct-phonon injection terahertz quantum cascade laser”, Appl. Phys. Lett. 122, 221103 (2023).
2. Wang, L., Chen, M., Lin, T. T., Wang, K., and Hirayama, H.:“Interdiffusion limiting on self-consistent optical gain in terahertz quantum cascade lasers”, Appl. Phys. Express 16, 072004 (2023).
3. Wang, L., Lin, T. T., Chen, M., Wang, K., and Hirayama, H.:“Terahertz quantum cascade laser considering compositional interdiffusion effect”, Appl. Phys. Express 16, 032007 (2023).
4. Lin, T. T., Wang, L., Wang, K., Grange, T., Birner, S., Miyoshi, T., and Hirayama, H.: “Increasing the output power of a heavily doped terahertz quantum cascade laser by avoiding the subband misalignment”, J. Appl. Phys. 132, 173101 (2022).
5. Lin, T. T., Wang, L., Wang, K., Grange, T., Birner, S., and Hirayama, H.: “Over one watt output power terahertz quantum cascade lasers by using high doping concentration and variable barrier-well height”, Phys. Status Solidi RRL 16, 2200033 (2022).

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