Now showing items 1-20 of 2272

    • 1.06μm-1.35μm coherent pulse generation by a synchronously-pumped phosphosilicate Raman fiber laser 

      Elahi, Parviz; Makey, Ghaith; Turnalı, Ahmet; Tokel, Onur; İlday, Fatih Ömer (OSA, 2017)
      Summary form only given. Rare-earth-doped fiber lasers are attractive for microscopy and imaging applications and have developed over the past decades rapidly. They are unable to cover near-infra-red region entirely and ...
    • 10 W, 10 ns, 50 kHz all-fiber laser at 1.55 µm 

      Pavlov, Ihor; Dülgergil, E.; İlbey, Emrah; İlday, Fatih Ömer (Optical Society of America, 2012)
      We report on an all-fiber, singlemode MOPA system at 1.55 µm producing 10-ns, 200-µJ pulses with 20 kW of peak power and utilize it to micromachine crystalline Si, which is largely transparent at this wavelength.
    • 10-W, 156-MHz all-fiber-integrated Er-Yb-doped fiber laser-amplifier system 

      Pavlov, Ihor; İlbey, Emrah; Dülgergil, Ebru; İlday, Fatih Ömer (Optical Society of America, 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 ...
    • 11th international conference MMET*2006 

      Altıntaş, Ayhan (IEEE, 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, ...
    • A 128-bit microprocessor compatible programmable correlator chip for use in synchronous communication 

      Ungan, İ. Enis; Topçu, Satılmış; Atalar, Abdullah (IEEE, 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, Bülend; Lecaplain, C.; Hideur, A.; Limpert J.; Tünnermann, A. (OSA, 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 ...
    • 2-D adaptive prediction based Gaussianity tests in microcalcification detection 

      Gürcan, M. Nafi; Yardımcı, Yasemin; Çetin, A. Enis (SPIE, 1998-01)
      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 ...
    • 2-nm laser-synthesized Si nanoparticles for low-power charge trapping memory devices 

      El-Atab, N.; Özcan, Ayşe; Alkış, Sabri; Okyay, Ali K.; Nayfeh, A. (IEEE, 2014-08)
      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 ...
    • 2D simultaneous localization and mapping for unmanned aerial vehicles 

      Kök, M.; Barshan, B. (2008)
      In this work, a 2D vision-based Simultaneous Localization and Mapping algorithm is developed for an Unmanned Aerial Vehicle flying at a constant altitude. We use visual features of images obtained from an on-board camera ...
    • 3 boyutlu kartezyen olmayan paralel görüntülemede değişken görüntü alanına dayalı geriçatım 

      Şenel, Celal Furkan; Çukur, Tolga (IEEE, 2018)
      MRG’de yaygın olarak kullanılan geriçatım yöntemleri değişken yoğunluklu Kartezyen olmayan taramalara da uygulanabilmektedir; fakat bu durumda bu yöntemlerin genellikle yüksek hesaplama karmaşıklığı içeren çok ...
    • 3-Boyutlu orman yangını yayılımı sistemi 

      Köse, Kıvanç; Yılmaz, E.; Grammalidis, N.; Aktuğ, B.; Çetin, A. Enis; Aydın, İ. (IEEE, 2008)
      In the last few years, due to the global warming and draught related to it, there is an increase in the number of forest fires. Forest fire detection is mainly done by people but there exists some automated systems in this ...
    • 3-dimensional median filters for image sequence processing 

      Alp, M. Bilge,; Neuvo, Y. (IEEE, 1991-04)
      Two 3-D median-based filtering algorithms have been developed that preserve the motion in the image sequence while attenuating noise effectively. Some observations are made on the root signals in binary domain based on the ...
    • 3.5-W, 42-MHz, single-mode chirped pulse amplification fiber laser System at 1560 nm 

      Elahi P.; Li H.; Ilday F.Ö. (OSA - The Optical Society, 2017)
      [No abstract available]
    • 3.5-W, femtosecond chirped pulse amplification fiber laser system at 1560 nm 

      Elahi, Parviz; Li, Huihui; İlday, Fatih Ömer (IEEE, 2017)
      We report a single-mode, 42 MHz, 3.5-W average power chirped pulse amplification fiber laser system operating at 1560 nm. The laser system comprises a dispersion-managed mode-locked oscillator and twoamplifier stages. The ...
    • 30-fs 1.6 mJ Pulses at a kHz repetition rate from a single stage DPSS 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 cw-diode-pumped Yb:CaF2 MOPA are spectrally broadened in Ar and recompressed to 30 fs at 980 nm using a prism pair. Multi-millijoule 12-fs pulses are feasible upon higher-order spectral phase ...
    • 33-fs Yb-fiber laser comb locked to Cs-atomic clock 

      Şenel, Çağrı; Hamid, R.; Erdoğan, C.; Çelik, M.; Kara, O.; İlday, Fatih Ömer (IEEE, 2013)
      Despite the prevalence of fiber frequency combs around 1.5 μm, few fully stabilized frequency combs have been demonstrated around 1.0 μm, despite the generally superior performance of Yb-fiber lasers compared to Er-fiber ...
    • A 3D dynamic model of a spherical wheeled self-balancing robot 

      İnal, Ali Nail; Morgül, Ömer; Saranlı, Uluç (2012)
      Mobility through balancing on spherical wheels has recently received some attention in the robotics literature. Unlike traditional wheeled platforms, the operation of such platforms depends heavily on understanding and ...
    • 3D electron density estimation in the ionosphere 

      Tuna, Hakan; Arıkan, Orhan; Arıkan, F. (IEEE, 2014)
      Ionosphere has ion distribution which is variable in space and time. There have been physical and empirical studies for modeling the ionosphere. International Reference Ionosphere extended to Plasmasphere (IRI-Plas) is the ...
    • 3D forest fire propagation simulation 

      Köse K.; Grammalidis, N.; Yilmaz, E.; Çetin, E. (2008)
      The increase in the number of forest fires in the last few years dispatch governments to take precautions. Besides prevention, early intervention is also very important in fire fighting. If the firefighters know where the ...