77 K Operation Of Algaas/Gaas Quantum Cascade Laser At 9 Mu M

The cryogenic-temperature (77 K), pulsed mode operation of GaAs-based quantum cascade laser (QCL) is reported. This has been achieved by the use of GaAs/Al0.45Ga0.55As heterostructure. The laser design followed an "anticrossed-diagonal" scheme of Page et al. [1]. The QCL structures were grown by MBE, with Riber Compact 21T reactor. The double trench lasers were fabricated using standard processing technology, i.e., wet etching and Si3N4 for electrical insulation. Double plasmon confinement with Al-free waveguide has been used to minimize absorption losses.