A. Soibel, F. Capasso, C. Gmachl, M. L. Peabody, A. M. Sergent, R. Paiella, H. Y. Hwang, D. L. Sivco, A. Y. Cho, H. C. Liu, C. Jirauschek, and F. X. Kartner,
“Active Mode-Locking of Broadband Quantum Cascade Lasers,”
IEEE J. Quantum Electron., vol. 40, pp. 844-851, 2004. 

A. Soibel, F. Capasso, C. Gmachl, M. L. Peabody, A. M. Sergent, R. Paiella, D. L. Sivco, A. Y. Cho, and H. C. Liu,
“Stability of Pulse Emission and Enhancement of Intracavity Second-Harmonic Generation in Self-Mode-Locked Quantum Cascade Lasers,”
IEEE J. Quantum Electron., vol. 40, pp. 197-204, 2004. 

R. Paiella, P. A. Kiely, A. Ougazzaden, J. W. Stayt, A. Sirenko, G. Derkits, K. Glogovsky, C. C. Wamsley, C. W. Lentz, L. E. Eng, and L. J. P. Ketelsen,
“10 Gbit/s Transmitter Based on Directly Modulated InGaAlAs Laser Operating up to 126 degrees C,”
Electron. Lett., vol. 39, pp. 1653-1654, 2003. 

C. Gmachl, H. M. Ng, R. Paiella, R. Martini, H. Y. Hwang, D. L. Sivco, F. Capasso, A. Y. Cho, S. V. Frolov, S. N. G. Chu, and H. C. Liu,
“Recent Results in Quantum Cascade Lasers and Intersubband Transitions in GaN/AlGaN Multiple Quantum Wells,”
Physica E, vol. 13, pp. 823-828, 2002.

F. Capasso, R. Paiella, R. Martini, R. Colombelli, C. Gmachl, T. L. Myers, M. S. Taubman, R. M. Williams, C. G. Bethea, K. Unterrainer, H. Y. Hwang, D. L. Sivco, A. Y. Cho, A. M. Sergent, H. C. Liu, and E. A. Whittaker,
“Quantum Cascade Lasers: Ultrahigh-Speed Operation, Optical Wireless Communication, Narrow Linewidth, and Far-Infrared Emission,”
IEEE J. Quantum Electron., vol. 38, pp. 511-532, 2002 (Invited Paper). 

R. Martini, C. G. Bethea, F. Capasso, C. Gmachl, R. Paiella, E. A. Whittaker, H. Y. Hwang, D. L. Sivco, J. N. Baillargeon, and A. Y. Cho,
“Free-Space Optical Transmission of Multimedia Satellite Data Streams Using Mid-Infrared Quantum Cascade Lasers,”
Electron. Lett., vol. 38, pp. 181-183, 2002. 

R. Martini, R. Paiella, C. Gmachl, F. Capasso, E. A. Whittaker, H. C. Liu, H. Y. Hwang, D. L. Sivco, J. N. Baillargeon, and A. Y. Cho,
“High-Speed Digital Data Transmission Using Mid-Infrared Quantum Cascade Lasers,”
Electron. Lett., vol. 37, pp. 1290-1292, 2001. 

R. Paiella, R. Martini, F. Capasso, C. Gmachl, H. Y. Hwang, D. L. Sivco, J. N. Baillargeon, A. Y. Cho, E. A. Whittaker, and H. C. Liu,
“High-Frequency Modulation without the Relaxation Oscillation Resonance in Quantum Cascade Lasers,”
Appl. Phys. Lett., vol. 79, pp. 2526-2528, 2001. 

C. Gmachl, F. Capasso, R. Colombelli, R. Paiella, D. L. Sivco, and A. Y. Cho,
“Quantum Cascade Lasers Shape up for Trace-Gas Sensing,”
Laser Focus World, pp. 65-70, Sept. 2001.

F. Capasso, R. Colombelli, R. Paiella, C. Gmachl, A. Tredicucci, D. L. Sivco, and A. Y. Cho,
“Far-Infrared and Ultra-High-Speed Quantum Cascade Lasers,”
Optics and Photonics News, vol. 12, pp. 40-46, 2001. 

C. Gmachl, H. Y. Hwang, R. Paiella, D. L. Sivco, J. N. Baillargeon, F. Capasso, and A. Y. Cho,
“Quantum Cascade Lasers with Low-Loss Chalcogenide Lateral Waveguides,”
IEEE Photon. Technol. Lett., vol. 13, pp. 182-184, 2001. 

R. Martini, C. Gmachl, J. Falciglia, F. G. Curti, C. G. Bethea, F. Capasso, E. A. Whittaker, R. Paiella, A. Tredicucci, A. L. Hutchinson, D. L. Sivco, A. Y. Cho,
“High-Speed Modulation and Free-Space Optical Audio/Video Transmission Using Quantum Cascade Lasers,”
Electron. Lett.., vol. 37, pp. 191-193, 2001. 

F. Capasso, C. Gmachl, R. Paiella, A. Tredicucci, A. L. Hutchinson, D. L. Sivco, J. N. Baillargeon, A. Y. Cho, and H. C. Liu
“New Frontiers in Quantum Cascade Lasers and Applications,”
IEEE J. Select. Topics in Quantum Electron., Special Millennium Issue, vol. 6, pp. 931-947, 2000 (Invited Paper). 

R. Paiella, F. Capasso, C. Gmachl, C. G. Bethea, H. Y. Hwang, D. L. Sivco, J. N. Baillargeon, A. Y. Cho, and H. C. Liu,
“Gain-Switching and Active Mode-Locking of Mid-Infrared Quantum Cascade Lasers,”
Optics and Photonics News, Optics in 2000 issue, vol. 11, pp. 22-23, 2000. 

R. Paiella, F. Capasso, C. Gmachl, D. L. Sivco, J. N. Baillargeon, A. L. Hutchinson, A. Y. Cho, and H. C. Liu,
“Self-Mode-Locking of Quantum Cascade Lasers with Giant Ultrafast Optical Nonlinearities,”
Science, vol. 290, pp. 1739-1742, 2000.

R. Paiella, F. Capasso, C. Gmachl, C. G. Bethea, D. L. Sivco, J. N. Baillargeon, A. L. Hutchinson, A. Y. Cho, and H. C. Liu
"Generation and Detection of High-Speed Pulses of Midinfrared Radiation with Intersubband Semiconductor Lasers and Detectors,"
IEEE Photon. Technol. Lett., vol.12, pp. 780-782, 2000.      

R. Paiella, F. Capasso, C. Gmachl, H. Y. Hwang, D. L. Sivco, A. L. Hutchinson, A. Y. Cho, and H. C. Liu,
“Monolithic Active Mode-Locking of Quantum Cascade Lasers,”
Appl. Phys. Lett., vol. 77, pp. 169-171, 2000. 

R. Paiella, F. Capasso, C. Gmachl, C. G. Bethea, D. L. Sivco, J. N. Baillargeon, A. L. Hutchinson, and A. Y. Cho,
"High-Speed Operation of Gain-Switched Midinfrared Quantum Cascade Lasers,"
Appl. Phys. Lett., vol. 75, pp. 2536-2538, 1999. 

R. Paiella, G. Hunziker, and K. J. Vahala,
"Quantum-Well Capture and Interwell Transport in Semiconductor Active Layers,"
Semicond. Sci. Technol., vol. 14, pp. R17-R25, 1999 (Invited Topical Review). 

A. D'Ottavi, P. Spano, G. Hunziker, R. Paiella, R. Dall'Ara, G. Guekos, and K. J. Vahala,
"Wavelength Conversion at 10 Gb/s by Four-Wave Mixing Over a 30-nm Interval,"
IEEE Photon. Technol. Lett., vol. 10, pp. 952-954, 1998. 

R. Paiella, G. Hunziker, M. Ziari, A. Mathur, and K. J. Vahala,
"Wavelength Conversion by Cavity-Enhanced Injection-Locked Four-Wave Mixing in a Fiber-Bragg-Grating Coupled Diode Laser,"
IEEE Photon. Technol. Lett., vol. 10, pp. 802-804, 1998. 

R. Paiella, G. Hunziker, K. J. Vahala, and U. Koren,
"Four-Wave Mixing Mediated by the Capture of Electrons and Holes in Semiconductor Quantum-Well Laser Amplifiers,"
Appl. Phys. Lett., vol. 71, pp. 3601-3603, 1997. 

G. Hunziker, R. Paiella, M. Ziari, A. Mathur, and K. J. Vahala,
"Folded-Path, Self-Pumped Wavelength Conversion Based on Four-Wave Mixing in a Semiconductor Optical Amplifier,"
IEEE Photon. Technol. Lett., vol. 9, pp. 1352-1354, 1997. 

K. J. Vahala, R. Paiella, and G. Hunziker,
"Ultrafast WDM Logic,"
IEEE J. Select. Topics in Quantum Electron., vol. 3, pp. 698-701, 1997. 

R. Paiella, G. Hunziker, U. Koren, and K. J. Vahala,
"Polarization-Dependent Optical Nonlinearities of Multiquantum-Well Laser Amplifiers Studied by Four-Wave Mixing,"
IEEE J. Select. Topics in Quantum Electron., vol. 3, pp. 529-540, 1997. 

G. Hunziker, R. Paiella, K. J. Vahala, and U. Koren,
"Measurement of the Stimulated Carrier Lifetime in Semiconductor Optical Amplifiers by Four-Wave Mixing of Polarized ASE Noise,"
IEEE Photon. Technol. Lett., vol. 9, pp. 907-909, 1997. 

R. Paiella, G. Hunziker, K. J. Vahala, and U. Koren,
"Measurement of the Interwell Carrier Transport Lifetime in Multiquantum-Well Optical Amplifiers by Polarization-Resolved Four-Wave Mixing,"
Appl. Phys. Lett., vol. 69, pp. 4142-4144, 1996. 

G. Hunziker, R. Paiella, D. F. Geraghty, K. J. Vahala, and U. Koren,
"Polarization-Independent Wavelength Conversion at 2.5 Gb/s by Dual-Pump Four-Wave Mixing in a Strained Semiconductor Optical Amplifier,"
IEEE Photon. Technol. Lett., vol. 8, pp. 1633-1635, 1996. 

R. Paiella, G. Hunziker, J. Zhou, K. J. Vahala, U. Koren and B. I. Miller,
"Polarization Properties of Four-Wave Mixing in Strained Semiconductor Optical Amplifiers,"
IEEE Photon. Technol. Lett., vol. 8, pp. 773-775, 1996. 

R. Paiella and K. J. Vahala,
"Four-Wave Mixing and Generation of TeraHertz Radiation in an Alternating-Strain Coupled Quantum-Well Structure,"
IEEE J. Quantum Electron., vol. 32, pp. 721-728, 1996. 

R. Paiella and K. J. Vahala,
"Highly Nondegenerate Four-Wave Mixing Efficiency of an Asymmetric Coupled Quantum-Well Structure,"
Appl. Phys. Lett., vol. 66, pp. 2619-2621, 1995. 

X. Y. Wang, R. Paiella, and R. M. Osgood, Jr.,
"Two-Dimensional Electron Scattering Processes on Na-Dosed Cu(111) – a Two-Photon Photoemission Study,"
Phys. Rev. B, vol. 51, pp. 17035-17039, 1995. 

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