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Real-time imaging using a 4.3-THz quantum cascade laser and a 240320 element focal-plane array

Real-time imaging using a 4.3-THz quantum cascade laser and ...

引用

Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser science Conference, CLEO/QELS 2006

作者： Lee, Alan Wei Min Kumar, Sushil Williams, Benjamin S. Hu, Qing Reno, John L. Department of Electrical Engineering and Computer Science Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA 02139 United States Sandia National Laboratories Department 1123 MS 0601 Albuquerque NM 87185-0601 United States

A real-time reflection/transmission imaging system is demonstrated using a 50-mW, 4.3-THz quantum cascade laser source in a closed-cycle cryorefrigerator, with a 240320 pixel microbolometer detector. A signal-to-noise... 详细信息

ISBN: (纸本)1557528136

关键词： Signal to noise ratio

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Optimization of active region for 1.3-μm GalnAsP compressive-strain multiple-quantum-well ridge waveguide laser diodes

Optimization of active region for 1.3-μm GalnAsP compressiv...

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作者： Lei, Po-Hsun Yang, Chyi-Dar Wu, Ming-Yuan Hu, Chih-Wei Wu, Meng-Chyi Huang, Yin-Hsun Ho, Wen-Jeng Department of Computer Science Engineering Diwan College of Management Tainan 721 Taiwan Department of Microelectronic Engineering National Kaohsiung Marine University Taiwan 811 Taiwan Department of Electrical Engineering National Tsing Hua University Hsinchu 300 Taiwan Advanced Technology Laboratory Telecommunication Laboratories Chunghwa Telecom Co. Ltd. Taoyuan 326 Taiwan

We report on the optimization of Ga0.27In0.73As 0.67P0.33/Ga0.11In0.89As 0.24P0.76 compressive-strain multiple-quantum-well (CS-MQW) grown by low-pressure metalorganic chemical vapor deposition for 1.3-μm ridge-waveguide laser diodes (LDs). The structural and optical properties are characterized by double-crystal x-ray diffraction and photoluminescence (PL) measurements, respectively. The optimum thicknesses of the well, barrier, and waveguide layer of the active region are 4 nm, 10 nm, and 100 nm, respectively. The GaInAsP/ GaInAsP CS-MQW as-cleaved LDs with the optimum active region, a 3.5-μm-width ridge, and a 900-μm-cavity length exhibit the threshold current density of 1.09 kA/cm2, a differential quantum efficiency of 30%, a characteristic temperature of 60 K, a maximum operating temperature up to 75°C, and a redshift rate of 0.30 nm/°C.

关键词： Semiconductor quantum wells

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An Iterative Algorithm for Autonomous Tasking in Sensor Networks

An Iterative Algorithm for Autonomous Tasking in Sensor Netw...

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IEEE Conference on Decision and Control

作者： Peter B. Jones Sanjoy K. Mitter MIT Lincoln Laboratories Lexington MA USA Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA USA

ISBN: (纸本)1424401704

Modern environments are saturated with sensors. These sensors may be active or passive, stationary or mobile, based on land, sea, air or space. They may differ in size, complexity, modes of operation, power, costs and a number of other features. The challenge in a sensor-rich environment is to coordinate the sensing of all the sensors in order to obtain the best total group performance. The complexity of the problem suggests that traditional methods of optimization will be prohibitively costly in terms of computation and communication. Additionally, there is some ambiguity over how to aggregate individual sensor utilities into a "best total group performance." Under these circumstances, game theoretic methods can be employed to both limit the computation and communication necessary for group coordination and avoid the problem of aggregating utilities. Specifically, an economic paradigm is adopted from which an efficient method for sensor coordination can be derived. The resultant coordination algorithm is shown to have bounded Pareto suboptimality, demonstrating the tradeoff between inter-sensor communication and utility optimization

关键词： Iterative algorithms Power generation economics Magnetic sensors Game theory USA Councils Space stations Costs Optimization methods Aggregates Environmental economics

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Silicon electronic photonic integrated circuits for high speed analog to digital conversion

Silicon electronic photonic integrated circuits for high spe...

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作者： Kärtner, F.X. Amataya, R. Barbastathis, G. Byun, H. Gan, F. Holzwarth, C.W. Hoyt, J.L. Ippen, E.P. Olubuyide, O.O. Orcutt, J.S. Park, M. Perrott, M. Popović, M.A. Rakich, P.T. Ram, R.J. Smith, H.I. Geis, M. Grein, M. Lyszczarz, T. Spector, S. Yoon, J.U. Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge MA 02139 United States bResearch Laboratory of Electronics Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge MA 02139 United States Department of Mechanical Engineering Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge MA 02139 United States Department of Material Science and Engineering Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge MA 02139 United States Microsystems Technology Laboratories Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge MA 02139 United States Department of Physics Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge MA 02139 United States Lincoln Laboratory Massachusetts Institute of Technology 244 Wood St. Lexington MA 02420 United States

Integrated optical components on the silicon platform and optically enhanced electronic sampling circuits are demonstrated that enable the fabrication of a variety of electronic-photonic A/D converter chips surpassing... 详细信息

关键词： Analog to digital conversion

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Phase-locking and linewidths of a two-color THz quantum cascade laser

Phase-locking and linewidths of a two-color THz quantum casc...

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17th International Symposium on Space Terahertz technology 2006, ISSTT 2006

作者： Hovenier, J.N. Baryshevyz, A. Adam, A.J.L. Kašalynas, I. Gao, J.R. Klaassen, T.O. Williamsx, B.S. Kumarx, S. Hux, Q. Reno, J.L. Kavli Institute of NanoScience Delft University of Technology Delft Netherlands SRON Netherlands Institute for Space Research Groningen/Utrecht Netherlands Kapteyn Astronomical Institute Groningen Netherlands Department of Electrical Engineering Computer Science and Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge United States Sandia National Laboratories Albuquerque United States

ISBN: (纸本)9781604239751

We report the phase stabilization and spectral linewidth of a 2.7 THz quantum cascade laser by heterodyning its two nearby lateral mode lasing lines using a superconducting NbN bolometer mixer. The beat signal at about 8 GHz is compared with a microwave reference by applying a conventional phase lock loop circuitry with a feedback to the laser bias current. Phase locking has been for the first time demonstrated, resulting in an extremely narrow beat linewidth of less than 10 Hz (limited by the resolution bandwidth of the spectrum analyzer). Moreover, our result demonstrates the feasibility of phase-lock of the THz signal itself. Under frequency-stabilization conditions we are able to study the emission spectrum of a THz QCL in a systematic way, which previously was *** find that the line profile is virtually Lorentzian with a long-term minimum linewidth of the THz modes of about 6.3 kHz. Temperature dependent measurements suggest that this linewidth does not approach the Schawlow-Townes limit.

关键词： Locks (fasteners)

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High-temperature and high-power terahertz quantum cascade lasers

High-temperature and high-power terahertz quantum cascade la...

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IEEE Photonics Conference (IPC)

作者： Benjamin S. Williams Sushil Kumar Qi Qin Qing Hu John L. Reno Department of Electrical Engineering and Computer Science Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA USA Department Sandia National Laboratories Albuquerque NM USA

We report the demonstration of terahertz QCLs based on a two-phonon depopulation scheme, intended to improve the high-temperature performance, and also the demonstration of QCLs emitting 250 mW in pulsed mode at 4.3 THz

关键词： Quantum cascade lasers Optical waveguides Temperature Optical pulses Optical scattering Current density Optical devices laboratories Resonance Particle scattering

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Multi-View Video Coding using View Interpolation and Reference Picture Selection

Multi-View Video Coding using View Interpolation and Referen...

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IEEE International Conference on Multimedia and Expo (ICME)

作者： Masaki Kitahara Hideaki Kimata Shinya Shimizu Kazuto Kamikura Yoshiyuki Yashima Kenji Yamamoto Tomohiro Yendo Toshiaki Fujii Masayuki Tanimoto Cyber Space Laboratories NTT Corporation Japan NTT Advanced Technology Corporation Japan Department of Electrical Engineering and Computer Science Graduate school of Engineering University of Nagoya Japan

We propose a new multi-view video coding method using adaptive selection of motion/disparity compensation based on H.264/AVC. One of the key points of the proposed method is the use of view interpolation as a tool for disparity compensation by assigning reference picture indices to interpolated images. Experimental results show that significant gains can be obtained compared to the conventional approach that was often used

关键词： Video coding Interpolation Cameras Automatic voltage control Decoding Space technology Predictive coding Image coding laboratories Educational institutions

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Making Packet Erasures to Improve Quality of FEC-Protected Video

Making Packet Erasures to Improve Quality of FEC-Protected V...

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IEEE International Conference on Image Processing

作者： Ying-zong Huang John G. Apostolopoulos Electrical Engineering & Computer Science Department Massachusetts Institute of Technology USA Streaming Media Systems Group Hewlett Packard Laboratories Palo Alto CA USA

Media delivery over lossy packet networks is a challenging problem, and forward error correction (FEC) based techniques are an important technique for overcoming packet loss. Conventional FEC-based media delivery techniques protect all packets equally, or protect a subset of the packets, or protect different subsets of packets with different levels of protection, e.g., scalable coding with unequal error protection (UEP). This paper proposes an FEC-based technique to maximize the expected received media quality by explicitly discarding packets, when beneficial, in order to provide additional room for FEC. Given knowledge of the importance of each packet, we show that there is a simple and intuitive criterion for the optimal selection of which packets to discard and which to protect, as well as the level of protection, to minimize the expected distortion experienced at the receiver. The proposed approach provides significant gains over the conventional approaches, and these gains are illustrated for the case of sending H.264 coded video data over a packet erasure channel with known packet loss rate.

关键词： Protection Forward error correction Decoding Error correction codes Streaming media computer science Application software Image coding Throughput Propagation losses

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High-power terahertz quantum cascade lasers

High-power terahertz quantum cascade lasers

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Conference on Lasers and Electro-Optics (CLEO)

作者： Benjamin S. Williams Sushil Kumar Qing Hu John L. Reno Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA USA Department 1123 Sandia National Laboratories Albuquerque NM USA

We report the demonstration of quantum-cascade lasers at ~4.4 THz (lambda ~ 68 mum) that emit 248 mW peak power in pulsed mode, and 138 mW continuous-wave power at heat-sink temperatures of 10 K.

ISBN: (纸本)1557528136

We report the demonstration of quantum-cascade lasers at ~4.4 THz (lambda ~ 68 mum) that emit 248 mW peak power in pulsed mode, and 138 mW continuous-wave power at heat-sink temperatures of 10 K.

关键词： Quantum cascade lasers Laser modes Optical waveguides Power lasers Surface emitting lasers Semiconductor lasers Imaging

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Long wavelength terahertz quantum-cascade lasers with one-well injector

Long wavelength terahertz quantum-cascade lasers with one-we...

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Conference on Lasers and Electro-Optics (CLEO)

作者： S. Kumar B.S. Williams Qing Hu J.L. Reno Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA USA Department 1123 Sandia National Laboratories Albuquerque NM USA

We report operation of terahertz quantum-cascade lasers at frequencies down to 1.86 THz (lambda ap 161 mum) using a single quantum-well injector that significantly reduces free-carrier losses. The laser threshold curr... 详细信息

ISBN: (纸本)1557528136

关键词： Quantum cascade lasers Semiconductor lasers Optical variables measurement Laser excitation Waveguide lasers Pump lasers laboratories

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