Browsing by Author "Diehl, L"

Now showing items 1-17 of 17

    • Activation energy study of electron transport in high performance short wavelengths quantum cascade lasers 

      Pflügl, Christian; Diehl, Laurent; Lyakh, Arkadiy; Wang, Qi Jie; Maulini, Richard; Tsekoun, Alexei; Patel, C. Kumar N.; Wang, Xiaojun; Capasso, Federico (The Optical Society, 2010)
      We present a method to study current paths through quantum cascade lasers (QCLs). The temperature dependence of the current is measured at a fixed voltage. At low temperatures we find activation energies that correspond ...

    • Beam Combining of Quantum Cascade Laser Arrays 

      Lee, Benjamin; Kansky, Jan; Goyal, Anish K.; Pflügl, Christian; Diehl, Laurent; Belkin, Mikhail A.; Sanchez, Antonio; Capasso, Federico (Optical Society of America, 2009)

    • Broadband Distributed-Feedback Quantum Cascade Laser Array Operating From 8.0 to 9.8 um 

      Lee, Benjamin G.; Zhang, Haifei; Pfluegl, Christian; Diehl, Laurent; Belkin, Mikhail A.; Fischer, Milan; Wittmann, Andreas; Faist, Jerome; Capasso, Federico (Institute of Electrical and Electronics Engineers, 2009)
      An ultra-broadband distributed-feedback quantum cascade laser array was fabricated, using a heterogeneous cascade based on two bound-to-continuum designs centered at 8.4 and 9.6 mum. This array emitted in a range over 220 ...

    • Coherent Coupling of Multiple Transverse Modes in Quantum Cascade Lasers 

      Yu, Nanfang; Diehl, Laurent; Cubukcu, Ertugrul; Bour, David; Corzine, Scott; Hoefler, Gloria; Wojcik, Aleksander K.; Crozier, Kenneth B.; Belyanin, Alexey; Capasso, Federico (American Physical Society, 2009)
      Quantum cascade lasers are a unique laboratory for studying nonlinear laser dynamics because of their high intracavity intensity, strong intersubband optical nonlinearity, and an unusual combination of relaxation time ...

    • DFB Quantum Cascade Laser Arrays 

      Lee, Benjamin G.; Belkin, Mikhail A.; Pflügl, Christian; Diehl, Laurent; Zhang, Haifei; Audet, Ross M.; MacArthur, Jim B.; Bour, David P.; Corzine, Scott W.; Höfler, Gloria E.; Capasso, Federico (Institute of Electrical and Electronics Engineers, 2009)
      DFB quantum cascade laser (DFB-QCL) arrays operating between 8.7 and 9.4 mum are investigated for their performance characteristics-single-mode selection of the DFB grating, and variability in threshold, slope efficiency, ...

    • Directional Emission and Universal Far-Field Behavior from Semiconductor Lasers with Limacon-Shaped Microcavity 

      Capasso, Federico; Yan, Changling; Wang, Qi Jie; Diehl, Laurent; Hentschel, Martina; Wiesig, Jan; Yu, Nanfang; Belkin, Mikhail A.; Edamua, Tadataka; Yamanishi, Masamichi; Kan, Hirofumi; Pflügl, Christian (American Institute of Physics, 2009)
      We report experimental demonstration of directional light emission from limaçon-shaped microcavity semiconductor lasers. Quantum cascade lasers (QCLs) emitting at \(\lambda \approx 10 \mu m\) are used as a model system. ...

    • High Performance Quantum Cascade Lasers Based on Three-Phononresonance Design 

      Wang, Qijie; Pflügl, Christian; Diehl, Laurent; Capasso, Federico; Edamura, Tadataka; Furuta, Shinichi; Yamanishi, Masamichi; Kan, Hirofumi (American Institute of Physics, 2009)
      A quantum cascade laser structure based on three-phonon-resonance design is proposed and demonstrated. Devices, emitting at a wavelength of 9 μm, processed into buried ridge waveguide structures with a 3 mm long, 16 μm ...

    • High Power Thermoelectrically Cooled and Uncooled Quantum Cascade Lasers With Optimized Reflectivity Facet Coatings 

      Maulini, Richard; Lyakh, Arkadiy; Tsekoun, Alexei; Go, Rowel; Pflügl, Christian; Diehl, Laurent; Capasso, Federico; Patel, C. Kumar N (American Institute of Physics, 2009)
      We present a method of preserving the device wall-plug efficiency by adjusting mirror losses with facet coatings for longer cavity quantum cascade lasers. An experimental study of output power and wall-plug efficiency as ...

    • Mode-Locked Pulses from Mid-Infrared Quantum Cascade Lasers 

      Wang, Christine Y.; Kuznetsova, Lyuba; Gkotsas, Vasileios‐Marios; Diehl, Laurent; Kaertner, Franz X.; Belkin, Mikhail A.; Belyanin, Alexey; Li, Xiaofeng; Ham, Donhee; Schneider, Harald; Grant, Peter; Song, C. Y.; Haffouz, Soufien; Wasilewski, Zbigniew; Liu, H. C.; Capasso, Federico (Optical Society of America, 2009-12-01)
      In this study, we report the unequivocal demonstration of midinfrared mode-locked pulses from quantum cascade lasers. The train of short pulses was generated by actively modulating the current and hence the gain of an ...

    • Nonlinear dynamics of coupled transverse modes in quantum cascade lasers 

      Wójcik, Aleksander K.; Yu, Nanfang; Diehl, Laurent; Capasso, Federico; Belyanin, Alexey (Informa UK Limited, 2010)
      We analyze the dynamics of broad-area mid-infrared quantum cascade lasers (QCLs). We show the possibility of the coherent coupling of several transverse modes which results in several interesting effects including frequency ...

    • Plasmonic Laser Antennas and Related Devices 

      Cubukcu, Ertugrul; Yu, Nanfang; Smythe, Elizabeth J.; Diehl, Laurent; Crozier, Kenneth B.; Capasso, Federico (IEEE Photonics Society, 2008)
      This paper reviews recent work on device applications of optical antennas. Localized surface plasmon resonances of gold nanorod antennas resting on a silica glass substrate were modeled by finite difference time-domain ...

    • Plasmonics for Laser Beam Shaping 

      Yu, Nanfang; Blanchard, R.; Fan, J.; Wang, Qi Jie; Pflugl, C.; Diehl, L; Edamura, T.; Furuta, S.; Yamanishi, M.; Kan, H.; Capasso, Federico (Institute of Electrical & Electronics Engineers (IEEE), 2010)
      This paper reviews our recent work on laser beam shaping using plasmonics. We demonstrated that by integrating properly designed plasmonic structures onto the facet of semiconductor lasers, their divergence angle can be ...

    • Semiconductor Lasers With Integrated Plasmonic Polarizers 

      Yu, Nanfang; Wang, Qi Jie; Pflügl, Christian; Diehl, Laurent; Capasso, Federico; Edamura, Tadataka; Furuta, Shinichi; Yamanishi, Masamichi; Kan, Hirofumi (American Institute of Physics, 2009)
      The authors reported the plasmonic control of semiconductor laser polarization by means of metallic gratings and subwavelength apertures patterned on the laser emission facet. An integrated plasmonic polarizer can project ...

    • Time-Resolved Investigations of Electronic Transport Dynamics in Quantum Cascade Lasers Based on Diagonal Lasing Transition 

      Choi, Hyunyong; Diehl, Laurent; Wu, Zong-Kwei; Giovannini, Marcella; Faist, Jérôme; Capasso, Federico; Norris, Theodore B. (Institute of Electrical and Electronics Engineers, 2009)
      In this study, the nature of electronic transport in quantum cascade lasers (QCLs) has been extensively investigated using an ultrafast time-resolved, degenerate, pump-probe optical technique. Our investigations enable ...

    • Ultrafast Rabi flopping and coherent pulse propagation in a quantum cascade laser 

      Choi, Hyunyong; Gkortsas, Vasileios-Marios; Diehl, Laurent; Bour, David; Corzine, Scott; Zhu, Jintian; Höfler, Gloria; Capasso, Federico; Kärtner, Franz X.; Norris, Theodore B. (Nature Publishing Group, 2010)
      Pulse propagation phenomena are central to ultrashort pulse generation and amplification in lasers1–5. In the coherent regime, the phase relationship between the pulse and the material transition is preserved, allowing ...

    • Wavelength Beam Combining of Quantum Cascade Laser Arrays for Remote Sensing 

      Capasso, Federico; Pfluegl, Christian; Diehl, Laurent; Lee, Benjamin; Kansky, Jan; Goyal, Anish; Belkin, Mikhail; Sanchez, Antonio (International Society for Optical Engineering, 2010-02-12)

    • Whispering-gallery mode resonators for highly unidirectional laser action 

      Wang, Q. J.; Yan, C.; Yu, N; Unterhinninghofen, J.; Wiersig, J.; Pflugl, C.; Diehl, L; Edamura, T.; Yamanishi, M.; Kan, H.; Capasso, Federico (Proceedings of the National Academy of Sciences, 2010)
      Optical microcavities can be designed to take advantage of total internal reflection, which results in resonators supporting whispering-gallery modes (WGMs) with a high-quality factor (Q factor). One of the crucial problems ...