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We have studied the current- and temperature-driven frequency tunability of quantum cascade lasers operating at 2.5 THz. The design of the active medium follows the so-called bound-to-continuum approach. One laser has a Fabry-Perot type resonator. It operates on several modes simultaneously. The other has a distributed feedback structure on top of the active medium which leads to single mode emission...
The experimental results of uniaxial stress study of optically pumped THz silicon lasers are presented. The uniaxial stress leads to the shift of pairs of valleys with respect to each other that, in turn, affects the intervalley scattering and causes changing of the lifetimes of principal states. The experiments carried out have shown considerable (10 times) decrease of pump threshold for Si:P and...
We have performed high resolution spectroscopy of rotational lines of 12CH316OH in a THz spectrometer based on a 2.5 THz distributed feedback quantum cascade laser (QCL). The absolute frequency was determined simultaneously with the absorption measurement by mixing part of the radiation from the QCL with the radiation from a THz gas laser in a Schottky diode.
Terahertz silicon lasers are based on intracenter transitions of group-V donors. The peculiarities due to electron-phonon interaction and the state-of-the-art performance such as frequency tunability by stress or magnetic field are discussed.
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