Now showing items 1-20 of 10059

  • 1 mJ pulse bursts from a Yb-doped fiber amplifier 

    Kalaycioglu H.; Eldeniz, Y.B.; Akçaalan O.; Yavas, S.; Gürel, K.; Efe, M.; Ilday F.O. (2012)
    We demonstrate burst-mode operation of a polarization-maintaining Yb-doped fiber amplifier capable of generating 60 μJ pulses within bursts of 11 pulses with extremely uniform energy distribution facilitated by a novel ...
  • 1.06μm-1.35μm coherent pulse generation by a synchronously- pumped phosphosilicate raman fiber laser 

    Elahi P.; Makey G.; Turnali A.; Tokel O.; Ilday F.Ö. (OSA - The Optical Society, 2017)
    [No abstract available]
  • 1.3 μm GaAs based resonant cavity enhanced Schottky barrier internal photoemission photodetector 

    Biyikli Necmi, Kimukin Ibrahim, Ozbay Ekmel, Tuttle Gary (IEEE, Piscataway, NJ, United States, 2000)
    GaAs based photodetectors operating at 1.3 μm that depend on internal photoemission as the absorption mechanism were fabricated. Quantum efficiency (QE) was increased using resonant cavity enhancement (RCE) effect.
  • 1/f noise characteristics of SEJ Y-Ba-Cu-O rf-SQUIDs on LaAlO 3 substrate and the step structure, film, and temperature dependence 

    Fardmanesh, M.; Schubert J.; Akram, R.; Bick, M.; Zhang, Y.; Banzet, M.; Zander W.; Krause H.-J.; Burkhart H.; Schilling, M. (2001)
    Step edge junction (SEJ) rf-SQUID magnetometers and gradiometers were fabricated using PLD Y-Ba-Cu-O films on LaAlO 3(100) and SrTiO 3(100) substrates. Effects of different step structure and the film properties on the ...
  • 10-W, 156-MHz all-fiber-integrated Er-Yb-doped fiber laser-amplifier system 

    Pavlov I.; Ilbey, E.; Dülgergil, E.; Ömer Ilday F. (2012)
    We demonstrate all-fiber, high-power chirped-pulse-amplifier system, operating at 1550 nm. 156-MHz soliton oscillator seeds a two-stage single-mode amplifier with output power of 10 W. After external compression, pulse ...
  • 100-GHz resonant cavity enhanced Schottky photodiodes 

    Onat, B.M.; Gökkavas, M.; Özbay, E.; Ata, E.P.; Towe, E.; Ünlü, M.S. (1998)
    Resonant cavity enhanced (RCE) photodiodes are promising candidates for applications in optical communications and interconnects where ultrafast high-efficiency detection is desirable. We have designed and fabricated RCE ...
  • 100-GHz resonant cavity enhanced Schottky photodiodes 

    Onat, B.M.; Gökkavas, M.; Özbay, E.; Ata, E.P.; Towe, E.; Ünlü, M.S. (1998)
    Resonant cavity enhanced (RCE) photodiodes are promising candidates for applications in optical communications and interconnects where ultrafast high-efficiency detection is desirable. We have designed and fabricated RCE ...
  • 1018 nm Yb-doped high-power fiber laser pumped by broadband pump sources around 915 nm with output power above 100 W 

    Midilli Y.; Efunbajo O.B.; Şimşek B.; Ortaç B. (OSA - The Optical Society, 2017)
    We demonstrate a 1018 nm ytterbium-doped all-fiber laser pumped by tunable pump sources operating in the broad absorption spectrum around 915 nm. In the experiment, two different pump diodes were tested to pump over a wide ...
  • 11th international conference MMET*2006 

    Altintas, A. (2007)
    The 11th International Conference on Mathematical Methods in Electromagnetic Theory (MMET*06) was organized and sponsored by the IEEE AP-S East Ukraine Joint Chapter at the Kharkiv National University, Kharkiv, Ukraine, ...
  • 128-bit microprocessor compatible programmable correlator chip for use in synchronous communication 

    Ungan I.Enis, Topcu Satilmis, Atalar Abdullah (Publ by IEEE, Piscataway, NJ, United States, 1989)
    A single-chip microprocessor-compatible 128-b correlator is designed and implemented in a 3-μm M2CMOS process. Full-custom design techniques are applied to achieve the best tradeoff among chip size, speed, and power ...
  • 130 nJ 77 fs dissipative soliton fiber laser 

    Baumgartl, M.; Ortaç, B.; Lecaplain, C.; Hideur, A.; Limpert J.; Tünnermann, A. (2010)
    We report on ultrashort high-energy pulse generation from an all-normal-dispersion fiber oscillator. The watt-level laser directly emits chirped pulses with a duration of 1ps and 163nJ of pulse energy. These can be compressed ...
  • 130 nJ 77 fs dissipative soliton fiber laser 

    Baumgartl, M.; Ortaç, B.; Lecaplain, C.; Hideur, A.; Limpert J.; Tünnermann, A. (2010)
    We report on ultrashort high-energy pulse generation from an all-normal-dispersion fiber oscillator. The watt-level laser directly emits chirped pulses with a duration of lps and 163nJ of pulse energy. These can be compressed ...
  • 15-Lipoxygenase-1 re-expression in colorectal cancer alters endothelial cell features through enhanced expression of TSP-1 and ICAM-1 

    Tunçer S.; Keşküş A.G.; Çolakoğlu M.; Çimen I.; Yener C.; Konu Ö.; Banerjee S. (Elsevier Inc., 2017)
    15-lipoxygenase-1 (15-LOX-1) oxygenates linoleic acid to 13(S)-hydroxyoctadecadienoic acid (HODE). The enzyme is widely suppressed in different cancers and its re-expression has tumor suppressive effects. 15-LOX-1 has been ...
  • 175 fs-long pulses from a high-power single-mode Er-doped fiber laser at 1550 nm 

    Elahi P.; Kalaycıoğlu H.; Li H.; Akçaalan Ö.; Ilday F.Ö. (Elsevier B.V., 2017)
    Development of Er-doped ultrafast lasers have lagged behind the corresponding developments in Yb- and Tm-doped lasers, in particular, fiber lasers. Various applications benefit from operation at a central wavelength of 1.5 ...
  • 2 + 1 KdV(N) equations 

    Gürses, M.; Pekcan, A. (2011)
    We present some nonlinear partial differential equations in 2 + 1-dimensions derived from the KdV equation and its symmetries. We show that all these equations have the same 3-soliton solution structures. The only difference ...
  • 2-D adaptive prediction based Gaussianity tests in microcalcification detection 

    Nafi Gürcan, M.; Yardimci, Y.; Enis Çetin, A. (1998)
    With increasing use of Picture Archiving and Communication Systems (PACS), Computer-aided Diagnosis (CAD) methods will be more widely utilized. In this paper, we develop a CAD method for the detection of microcalcification ...
  • A 2-D orientation-adaptive prediction filter in lifting structures for image coding 

    Gerek Ö.N.; Çetin, A.E. (2006)
    Lifting-style implementations of wavelets are widely used in image coders. A two-dimensional (2-D) edge adaptive lifting structure, which is similar to Daubechies 5/3 wavelet, is presented. The 2-D prediction filter predicts ...
  • 2-Killing vector fields on warped product manifolds 

    Shenawy, S.; Ünal, B. (World Scientific Publishing Co. Pte Ltd, 2015)
    This paper provides a study of 2-Killing vector fields on warped product manifolds as well as characterization of this structure on standard static and generalized Robertson-Walker space-times. Some conditions for a 2-Killing ...
  • 2-nm laser-synthesized Si nanoparticles for low-power charge trapping memory devices 

    El-Atab, N.; Ozcan, A.; Alkis, S.; Okyay, A., K.; Nayfeh, A. (Institute of Electrical and Electronics Engineers Inc., 2014)
    In this work, the effect of embedding Silicon Nanoparticles (Si-NPs) in ZnO based charge trapping memory devices is studied. Si-NPs are fabricated by laser ablation of a silicon wafer in deionized water followed by sonication ...
  • 20-fs 1.6-mJ pulses from a cw-diode-pumped single-stage 1-kHz Yb amplifier 

    Andriukaitis G.; Kartashov, D.; Pugžlys, A.; Lorenc, D.; Baltuška, A.; Giniunas L.; Danielius, R.; Ilday O.F. (2010)
    200-fs 2.5-mJ pulses from a fiber-oscillator-seeded DPSS Yb:CaF2 MOPA are spectrally broadened in Ar and recompressed to 20 fs using a pair of LAK14 prisms. Multi-millijoule 12-fs pulses are feasible upon higher-order ...