Now showing items 1-20 of 2375

    • 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 ...
    • 1.7-GHz intra-burst repetition rate Yb-fiber amplifier system 

      Kalaycıoğlu, Hamit; Elahi, Parviz; Kerse, Can; Akçaalan, Önder; İlday, F. Ömer (IEEE, 2015)
      Material processing efficiency of ultrafast pulses increases dramatically with repetition rate of the pulses, if the conditions are adjusted correctly to avoid excessive plasma and particulate shielding. However, given ...
    • 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 μJ 150 fs all-fiber Yb laser amplifier system 

      Akçaalan, Önder; Kalaycıoğlu, Hamit; Kesim, Denizhan Koray; İlday, F. Ömer (IEEE, 2015)
      Femtosecond laser pulse sources have become increasingly popular in the last decade as a result of their practical features, such as insensitivity to environmental variations, versatile designs, high-power outputs. However, ...
    • 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-D triangular mesh-based mosaicking for object tracking in the presence of occlusion 

      Toklu, C.; Tekalp, A. M.; Erdem, A. Tanju (SPIE, 1997)
      In this paper, we describe a method for temporal tracking of video objects in video clips. We employ a 2D triangular mesh to represent each video object, which allows us to describe the motion of the object by the displacements ...
    • 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.; Pugzlys, A.; Lorenc, D.; Baltuska, A.; Giniunas, L.; Danielius, R.; İlday, Ömer Fatih (OSA, 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 ...
    • 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, Parviz; Li, Huihui; İlday, Fatih Ömer (OSA, 2017)
      There is much interest in the development of high power ultra-short fiber laser systems due to their significant properties and applications. Among them, Er-doped fiber lasers are showing more attention, especially in ...
    • 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.; Pugzlys, A.; Lorenc, D.; Baltuska, A.; Giniunas, L.; Danielius, R.; İlday, Ömer Fatih (OSA, 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 ...