Results 261 to 270 of about 16,866 (296)
Some of the next articles are maybe not open access.
Quantum Cascade Laser Spectroscopy
2021Over the past few decades, the progress in applications of quantum cascade laser (QCL) spectroscopy has accelerated with breathtaking way since its discovery in 1994. The unique properties of QCL such as certain access in mid-IR spectral range, narrow emission pure spectrum, and wide tuning capabilities have enabled to develop new-generation analytical
Mithun Pal, Manik Pradhan
openaire +1 more source
SPIE Proceedings, 2005
Oscillators based on Raman gain, known in the literature as Raman lasers, have until now necessitated an external optical pump. A powerful multi-watt fundamental laser radiation is usually required to offset a small value of the Raman gain coefficient, typically several 10-9cm/W in most Raman-active media.
Mariano Troccoli +5 more
openaire +1 more source
Oscillators based on Raman gain, known in the literature as Raman lasers, have until now necessitated an external optical pump. A powerful multi-watt fundamental laser radiation is usually required to offset a small value of the Raman gain coefficient, typically several 10-9cm/W in most Raman-active media.
Mariano Troccoli +5 more
openaire +1 more source
Applied Physics Letters, 1996
The fabrication and characterization of quantum cascade (QC) disk lasers at 5 μm wavelength is reported. The QC scheme yields several advantages for the disk geometry: an inherently transverse magnetic polarization, tailorable wavelength, and unipolar carrier transport.
Faist J +6 more
openaire +1 more source
The fabrication and characterization of quantum cascade (QC) disk lasers at 5 μm wavelength is reported. The QC scheme yields several advantages for the disk geometry: an inherently transverse magnetic polarization, tailorable wavelength, and unipolar carrier transport.
Faist J +6 more
openaire +1 more source
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
Quantum guidelines for solid-state spin defects
Nature Reviews Materials, 2021Gary Wolfowicz +2 more
exaly
Weyl, Dirac and high-fold chiral fermions in topological quantum matter
Nature Reviews Materials, 2021M Zahid Hasan +2 more
exaly
InP colloidal quantum dots for visible and near-infrared photonics
Nature Reviews Materials, 2023Guilherme Almeida
exaly