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The transmittance of a coupling mirror strongly influences the power and efficiency of the laser. Optimal index of coupling can be various on different laser operating modes and consequently, resonators with tuned coupling sometimes required. We have developed the terahertz laser resonator with smooth coupling change. Coupling change can be carried out directly while the laser operation. Coupling...
Stimulated donor and Raman Stokes emission has been achieved under intracenter excitation and photoionization of shallow donor centers in silicon. A pulsed laser emission of up to a few mW of peak power in the 1-7 THz frequency range has been obtained at low temperatures (< 30 K). Thorough laser characterization and further optimization of the laser threshold and efficiency has been carried out.
We review the development of terahertz quantum-cascade lasers (QCLs) that can be uniquely qualified based on a resonant-phonon depopulation scheme. Record performances in terms of operating temperature and optical power output are reported. The best temperature performance is achieved in the metal-metal (MM) waveguides, which provide near-unity mode confinement and low waveguiding loss at terahertz...
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