Results 161 to 170 of about 28,891 (190)
Some of the next articles are maybe not open access.
2011
Aquantum cascade laser contains active regions and conducting regions in turn. An active region contains three electron subbands. An electron injected into the upper subband undergoes a stimulated transition to the lower subband and reaches, after a nonradiative relaxation process, the lowest subband.
openaire +1 more source
Aquantum cascade laser contains active regions and conducting regions in turn. An active region contains three electron subbands. An electron injected into the upper subband undergoes a stimulated transition to the lower subband and reaches, after a nonradiative relaxation process, the lowest subband.
openaire +1 more source
Superlattice quantum cascade lasers
SPIE Proceedings, 1999Novel approaches to the design of inter-miniband quantum cascade lasers with undoped active regions are presented. The applied electric field is compensated across the superlattices, either by exploiting the field generated by extrinsic charges in special modulation-doped injection regions, or with an effective 'quasi-electric field' obtained by ...
TREDICUCCI, ALESSANDRO +6 more
openaire +2 more sources
2017
The quantum cascade laser represents an important accomplishment in quantum photonics, combining quantum excitation of the electromagnetic field, electron transport and controllable quantum mechanical tunneling all working cooperatively in a single device. In cascade lasers, the carriers are “recycled” from one stage to the next, so that the evacuation
openaire +2 more sources
The quantum cascade laser represents an important accomplishment in quantum photonics, combining quantum excitation of the electromagnetic field, electron transport and controllable quantum mechanical tunneling all working cooperatively in a single device. In cascade lasers, the carriers are “recycled” from one stage to the next, so that the evacuation
openaire +2 more sources
2019
In this chapter, we present a brief overview of the QCL technology with an emphasis on the commercially important 3 μm to 12 μm spectral region covering the infrared fingerprint spectral region and the two infrared atmospheric windows (3 to 5 μm and 8 to 12 μm).
openaire +1 more source
In this chapter, we present a brief overview of the QCL technology with an emphasis on the commercially important 3 μm to 12 μm spectral region covering the infrared fingerprint spectral region and the two infrared atmospheric windows (3 to 5 μm and 8 to 12 μm).
openaire +1 more source