3.4-THz quantum cascade laser based on longitudinal-optical-phonon scattering for depopulation

  • Williams B
  • Callebaut H
  • Kumar S
 et al. 
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We report the development of a quantum cascade laser, at λ = 87.2 μm, corresponding to 3.44 THz or 14.2 meV photon energy. The GaAs/Al0.15Ga0.85As laser structure utilizes longitudinal-optical (LO) phonon scattering for electron depopulation. Laser action is obtained in pulsed mode at temperatures up to 65 K, and at 50% duty cycle up to 29 K. Operating at 5 K in pulsed mode, the threshold current density is 840 A/cm2, and the peak power is approximately 2.5 mW. Based on the relatively high operating temperatures and duty cycles, we propose that direct LO-phonon-based depopulation is a robust method for achieving quantum cascade lasers at long-wavelength THz frequencies.

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  • Benjamin S. Williams

  • Hans Callebaut

  • Sushil Kumar

  • Qing Hu

  • John L. Reno

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