Coherent light generators – Particular active media – Semiconductor
Patent
1998-09-23
2000-04-25
Bovernick, Rodney
Coherent light generators
Particular active media
Semiconductor
372 43, H01S 318, H01S 319
Patent
active
060552549
ABSTRACT:
Instead of trying to keep the SLs of a QC laser field free, we "pre-bias" the actual electronic potential by varying the SL period (and hence average composition) so as to achieve an essentially flat profile, on average, of upper and lower minibands, despite the presence of an applied field in the SLs. In one embodiment, in at least a first subset of the QW layers, the thicknesses of the QW layers are varied from QW layer to QW layer so as to increase in the direction of the applied field. In this embodiment, the upper and lower lasing levels are located, in the absence of an applied electric field, each at different energies from layer to layer within the first subset, so that despite the presence of an applied field, the desired flatband condition of the upper and lower minibands is realized. In a preferred embodiment, the thicknesses of the QW layers within the first subset are varied from QW layer to QW layer so as to increase in the direction of the applied field, and the thicknesses of a second subset of the barrier layers are also varied from barrier layer to barrier layer so as to decrease or increase in the direction of the applied field.
REFERENCES:
patent: 5457709 (1995-10-01), Capasso et al.
patent: 5502787 (1996-03-01), Capasso et al.
patent: 5509025 (1996-04-01), Capasso et al.
patent: 5936989 (1999-08-01), Capasso et al.
T. Nakagawa et al., "New Negative-Resistance Device By a Chirp Superlattice". . . , Electron. Lett., vol. 19, No. 20, pp. 822-823 (Sep. 1983).
T. Nakagawa et al., Superlattices and Microstructures, "Design Principles for Chirp Superlattice Devices", vol. 1, No. 2, pp. 187-192 (1985) (no month).
T. Nakagawa et al., "Observation of Negative Differential Resistance in Chirp Superlattices". . . , Electron. Lett., vol. 21, No. 19, pp. 882-884 (Sep. 1986).
C. J. Summers et al., "Variably spaced superlattice energy filter a new device concept for high-energy electron injection". . . , Appl. Phys. Lett., vol. 48, No. 12, pp. 806-808 (Mar. 1986).
G. Scamarcio et al., "High-Power Infrared (8-Micrometer Wavelength) Superlattice Lasers". . . , Science, vol. 276, pp. 773-776 (May 1997).
A. Tredicucci et al., "High-power inter-miniband Lasing in Intrinsic Superlattices". . . , Appl. Phys. Lett., vol. 72, No. 19, pp. 2388-2390 (May 1998).
M. Beck et al., "Buried heterostructure Quantum Cascade Lasers". . . , Proc. SPIE, vol. 3284, pp. 231-236 (1998) (no month).
C. Gmachl et al., "High-power .lambda. = 8 .mu.m Quantum Cascade Lasers with near Optimum Performance". . . , Appl. Phys. Lett., vol. 72, No. 24, pp. 3130-3132 (Jun. 1998).
Capasso Federico
Cho Alfred Yi
Gmachl Claire F.
Hutchinson Albert Lee
Sivco Deborah Lee
Bovernick Rodney
Leung Quyen P.
Lucent Technologies - Inc.
Pacher Eugen E.
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