Zobrazeno 1 - 10
of 132
pro vyhledávání: '"Albert L. Hutchinson"'
Autor:
Deborah L. Sivco, Claire F. Gmachl, Wolfgang Urban, Heiko Ganser, James N. Baillargeon, Federico Capasso, Alfred Y. Cho, Andreas Jentsch, M. Mürtz, Bertold Frech, Albert L. Hutchinson
Publikováno v:
Optics Communications. 197:127-130
We report line width measurements of a quantum cascade distributed feedback laser by a heterodyne experiment. At currents slightly above threshold and a laser output power higher than 1 mW, the full width at half maximum of the beat signal was narrow
Autor:
Sung Nee G. Chu, Alessandro Tredicucci, Deborah L. Sivco, Michael Clement Wanke, Claire F. Gmachl, Albert L. Hutchinson, Alfred Y. Cho, Federico Capasso
Publikováno v:
Optical Materials. 17:211-217
There is presently a lack of efficient, compact, solid-state sources for the spectral range 1-10 THz, also known as the "terahertz gap". In fact Gunn diodes fail at such high frequencies, while, from the other side, conventional semiconductor lasers
Autor:
Albert L. Hutchinson, R. Kohler, Alessandro Tredicucci, James N. Baillargeon, Federico Capasso, Claire F. Gmachl, Deborah L. Sivco, A.Y. Cho
Publikováno v:
IEEE Circuits and Devices Magazine. 16:10-18
The quantum cascade (QC) laser does not involve the material bandgap for the generation of light. Therefore, InP- and GaAs-based III-V semiconductor materials can now be used for the generation of long-wavelength, mid-infrared light. These materials
Autor:
Albert L. Hutchinson, Deborah L. Sivco, Alessandro Tredicucci, A.Y. Cho, Federico Capasso, C. Gmachl, Gaetano Scamarcio
Publikováno v:
IEEE Journal of Selected Topics in Quantum Electronics. 5:792-807
Superlattice quantum cascade (QC) lasers based on optical transitions between conduction minibands are unipolar semiconductor lasers with high-current-carrying capability and attendant high optical power due to miniband transport in the active and in
Autor:
C. Gmachi, R. Kohler, D.L. Sivxo, Alessandro Tredicucci, A.Y. Cho, Federico Capasso, Albert L. Hutchinson
Publikováno v:
IEEE Journal of Selected Topics in Quantum Electronics. 5:808-816
The cascading scheme is a characteristic feature of quantum cascade (QC) lasers. It implies that electrons above threshold generate one photon per active region they successively traverse, This paper presents a study of the cascading behavior as a fu
Autor:
Alessandro Tredicucci, Albert L. Hutchinson, Alfred Y. Cho, Deborah L. Sivco, Federico Capasso, Claire F. Gmachl
Publikováno v:
Nature. 396:350-353
Many systems, such as atoms and molecules in gas mixtures, dye solutions and some solid-state materials, can exhibit simultaneous laser action at several wavelengths as a result of the excitation of several optical transitions1. But semiconductor las
Publikováno v:
Physical Review B. 57:R6811-R6814
Generation of midinfrared electroluminescence associated with transitions between conduction-band Wannier-Stark ladder states in strongly coupled semiconductor superlattices is reported. Both intraladder and interladder transitions, in the two regime
Autor:
A.Y. Cho, Deborah L. Sivco, Albert L. Hutchinson, Federico Capasso, Jérôme Faist, Carlo Sirtori
Publikováno v:
IEEE Journal of Quantum Electronics. 34:1722-1729
Experimental evidence that in quantum cascade lasers electron injection into the active region is controlled by resonant tunneling between two-dimensional subbands is discussed. A quantitative analysis is carried out using an equation for the current
Autor:
Carlo Sirtori, Alfred Y. Cho, Albert L. Hutchinson, Deborah L. Sivco, Federico Capasso, Jrme Faist
Publikováno v:
Nature. 387:777-782
The threshold condition for laser action is usually achieved when the population difference between the initial and final energy levels of the laser transition reaches a critical value, determined by the equality between optical gain and losses. But
Autor:
Albert L. Hutchinson, Jérôme Faist, James N. Baillargeon, Carlo Sirtori, Alfred Y. Cho, Federico Capasso, Deborah L. Sivco, S. N. G. Chu
Publikováno v:
Journal of Crystal Growth. :22-28
A new quantum cascade laser is reported with very high performance at high temperatures. These high performances are obtained by a design combining low doping, a funnel injector and a three well vertical transition active region. A molecular beam epi