R Kohler, C Gmachl, F Capasso, A Tredicucci, DL Sivco, and AY Cho. 2000. “Single-mode tunable quantum cascade lasers in the spectral range of the CO2 laser at lambda=9.5-10.5 mu m.” IEEE PHOTONICS TECHNOLOGY LETTERS, 12, 5, Pp. 474-476.Abstract
Widely tunable, single-mode quantum cascade distributed feedback (QC-DFB) lasers based on a complex coupling scheme and operating in the wavelength range of the CO2 laser (lambda approximate to 9.5-10.5 mu m) are reported. Dynamic single-mode emission up to high current levels is obtained. The continuous single-mode tuning range is 150 nm, while the tuning range of the equivalent Fabry-Perot laser is similar to 400 nm, By homogeneously reducing all layer thicknesses by 10%, the wavelength coverage of a single QC-laser design can be extended to cover one entire regular band of the fundamental CO2 laser spectrum.
JT Remillard, Du Y, WH Weber, F Capasso, C Gmachl, AL Hutchinson, DL Sivco, JN Baillargeon, and AY Cho. 2000. “Sub-Doppler resolution limited Lamb-dip spectroscopy of NO with a quantum cascade distributed feedback laser.” OPTICS EXPRESS, 7, 7, Pp. 243-248.Abstract
A quantum cascade distributed feedback laser operating at 5.2 mu m is used to obtain sub-Doppler resolution limited saturation features in a Lamb-dip experiment on the R(13.5)(1/2) and R(13.5)(3/2) transitions of NO. The dips appear as transmission spikes with full widths of similar to 4.3 MHz. At this resolution the 73 MHz Lambda-doubling of the R(13.5)(3/2) line, which is normally obscured by the 130 MHz Doppler broadening, is easily resolved. (C) 2000 Optical Society of America.
A Tredicucci, C Gmachl, MC Wanke, F Capasso, AL Hutchinson, DL Sivco, SNG Chu, and AY Cho. 2000. “Surface plasmon quantum cascade lasers at lambda similar to 19 mu m.” APPLIED PHYSICS LETTERS, 77, 15, Pp. 2286-2288.Abstract
The longest wavelength III-V semiconductor laser to date has been realized employing a quantum cascade configuration for the active material. It operates at lambda similar to 19 mu m on interminiband transitions in graded superlattices. The waveguide is based on surface plasmon modes confined at a metal-semiconductor interface. The devices emit peak output powers of 14 mW per facet at 10 K and laser action is achieved up to the maximum temperature of 145 K. (C) 2000 American Institute of Physics. [S0003-6951(00)02341-X].
AA Kosterev, FK Tittel, C Gmachl, F Capasso, DL Sivco, JN Baillargeon, AL Hutchinson, and AY Cho. 2000. “Trace-gas detection in ambient air with a thermoelectrically cooled, pulsed quantum-cascade distributed feedback laser.” APPLIED OPTICS, 39, 36, Pp. 6866-6872.Abstract
A pulsed quantum-cascade distributed feedback laser operating at near room temperature was used for sensitive high-resolution IR absorption spectroscopy of ambient air at a wavelength of similar to8 mum. Near-transform-limited laser pulses were obtained owing to short (similar to5-ns) current pulse excitation and optimized electrical coupling. Fast and slow computer-controlled frequency scanning techniques were implemented and characterized. Fast computer-controlled laser wavelength switching was used to acquire second-derivative absorption spectra. The minimum detectable absorption was found to be 3 x 10(-4) with 10(5) laser pulses (20-kHz repetition rate), and 1.7 x 10(-4) for 5 x 10(5) pulses, based on the standard deviation of the linear regression analysis. (C) 2000 Optical Society of America OCIS codes: 140.5960, 280.3420, 300.6320, 010.1280.
A Tredicucci, C Gmachl, F Capasso, DL Sivco, SNG Chu, AL Hutchinson, and AY Cho. 2000. “Very long wavelength (lambda similar or equal to 16 mu m) whispering gallery mode microdisk lasers.” ELECTRONICS LETTERS, 36, 4, Pp. 328-330.Abstract
The longest wavelength whispering gallery semiconductor disk lasers fabricated tc date are reported. The devices operate at lambda similar or equal to 16 mu m up to a temperature of similar to 120K. They employ the quantum cascade scheme based on interminiband transitions in graded superlattices and are realised in the InGaAs/AlInAs material system.
ROBERTO PAIELLA, Federico Capasso, Claire Gmachl, Clyde G. Bethea, Harold Y. Hwang, Deborah L. Sivco, James N. Baillargeon, Albert L. Hutchinson, Alfred Y. Cho, and H. C. Liu. 2000. “Gain Switching and Active Mode Locking Of Mid-Infrared Quantum Cascade Lasers.” Opt. Photon. News 11 (12), Pp. 22–23. Publisher's Version