Now showing items 1-20 of 23

    • 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 ...
    • The alignment of nematic liquid crystal by the Ti layer processed by nonlinear laser lithography 

      Pavlov, Ihor; Rybak, A.; Dobrovolskiy, A.; Kadan, V.; Blonskiy, I.; İlday, Fatih Ömer; Kazantseva, Z.; Gvozdovskyy, I. (Taylor and Francis, 2018)
      It is well known that the alignment of liquid crystals (LCs) can be realised by rubbing or photoalignment technologies. Recently, nonlinear laser lithography (NLL) was introduced as a fast, relatively low-cost method for ...
    • Balancing gain narrowing with self phase modulation: 100-fs, 800-nJ from an all-fiber-integrated Yb amplifier 

      Pavlov, Ihor; Rybak, A.; Cenel, C.; İlday, F. Ömer (IEEE, 2013)
      There is much progress in Yb-fiber oscillator-amplifier systems, which enable generation of high-repetition-rate, microjoule energies and sub-picosecond pulse widths [1,2]. Given the extremely large total gain factors to ...
    • Computer-generated holograms embedded in bulk silicon with nonlinear laser lithography 

      Turnalı, Ahmet; Tokel, Onur; Makey, Ghaith; Pavlov, Ihor; İlday, Fatih Ömer (IEEE, 2016)
      Recently, we have showed a direct laser writing method to form subsurface structures inside silicon by exploiting nonlinear interactions. Here, we demonstrate utilization of this phenomenon to create computer-generated ...
    • Controlling laser-induced self-organized patterns via engineered defects 

      Ergecen, E.; Yavuz, Özgün; Tokel, Onur; Pavlov, Ihor; Rızaoğlu, Anıl; İlday, F. Ömer (IEEE, 2015)
      Nanoscale periodic surface structures are of paramount importance in material science [1]. The recently demonstrated Nonlinear Laser Lithography (NLL) technique allows creating nanostructure arrays over indefinitely large ...
    • Direct laser writing of volume fresnel zone plates in silicon 

      Turnalı, Ahmet; Tokel, Onur; Pavlov, Ihor; İlday, F. Ömer (IEEE, 2015)
      Functional optical elements fabricated on silicon (Si) constitute fundamental building blocks of Si photonics [1]. For the fabrication of these elements, conventional lithography and etching techniques are used. In spite ...
    • Doppler effect on nanopatterning with nonlinear laser lithography 

      Yavuz, Özgün; Kara, Semih; Tokel, Onur; Pavlov, Ihor; İlday, Fatih Ömer (OSA, 2017)
      Summary form only given. Just five years after invention of the laser, laser induced periodic structures (LIPSS) had been reported. However, the structure period is not very uniform in LIPSS. Recently, with nonlinear laser ...
    • Generation of 2-μ J 410-fs pulses from a single-mode chirped-pulse fiber laser operating at 1550 nm 

      Pavlova, S.; Rezaei, Hossein; Pavlov, Ihor; Kalaycıoğlu, Hamit; İlday, Fatih Omer (Springer Verlag, 2018)
      We report on a simple, robust, femtosecond chirped-pulse-amplification system, based on Er- and Er-Yb-doped fibers, operating at a central wavelength of 1555 nm. The entire system is constructed from commercially available ...
    • Highly stable periodic structures using nonlinear laser lithography 

      Yavuz, Oğuzhan; Pavlov, Ihor; Tokel, Onur; Ergeçen, E.; Rızaoğlu, Anıl; İlday, Fatih Ömer (IEEE, 2016)
      Nonlinear laser lithography (NLL) emerged as a novel surface structuring method allowing long-range periodic order. We present mathematical formalism for NLL, analysis of structure stability to perturbations and a way to ...
    • Holograms deep inside Silicon 

      Makey, Ghaith; Tokel, Onur; Turnalı, Ahmet; Pavlov, Ihor; Elahi, Parviz; Yavuz, Ozg ¨ un; İlday, F. Ömer (Optical Society of America, 2016)
      Through the Nonlinear Laser Lithography method, we demonstrate the first computer generated holograms fabricated deep inside Silicon. Fourier and Fresnel holograms are fabricated buried inside Si wafers, and a generation ...
    • Laser writing deep inside silicon for 3D information Processing 

      Tokel, Onur; Turnalı, Ahmet; Pavlov, Ihor; İlday, F. Ömer (IEEE, 2015)
      Micromachining of silicon (Si) with lasers is being investigated since the 1970s [1]. So far, generation of controlled subsurface modification in the bulk of Si with high precision has not been achieved. This is highly ...
    • Laser-patterning stainless steel with nonlinear laser lithography for enhanced tribological properties 

      Gnilitskyi, I.; Pavlov, Ihor; Rotundo, F.; Orazi, L.; İlday, Serim; Martini, C.; İlday, F. Ömer (IEEE, 2015)
      The production of nanostructures on different materials attracts much attention in different fields of manufacturing as a result of increased availability, affordability and technical capability of laser-based methods ...
    • Laser-slicing of silicon with 3D nonlinear laser lithography 

      Tokel, Onur; Turnalı, Ahmet; Çolakoğlu, T.; İlday, Serim; Borra, M. Z.; Pavlov, Ihor; Bek, A.; Turan, R.; İlday, Fatih Ömer (OSA, 2017)
      Recently, we have showed a direct laser writing method that exploits nonlinear interactions to form subsurface modifications in silicon. Here, we use the technique to demonstrate laser-slicing of silicon and its applications.
    • Mathematical model of nonlinear laser lithography 

      Yavuz, Özgün; Ergecen, E.; Tokel, Onur; Pavlov, Ihor; İlday, F. Ömer (IEEE, 2015)
      Laser induced periodic surface structures (LIPSS) had been observed just five years after the invention of laser [1]. Among the numerous LIPSS techniques none of them could maintain long-range order [2]. However, it has ...
    • Nonlinear chirped-pulse amplification of a soliton-similariton laser to ~1 µJ at 1550 nm 

      İlbey, Emrah; Pavlov, Ihor; Dülgergil, E.; Öktem, Bülent; Yavas, Seydi; Rybak, Andrii; Zhang, Zuxing; İlday, Fatih Ömer (Optical Society of America, 2012)
      We demonstrate all-fiber-integrated nonlinear CPA system operating at 1550 nm, seeded by a soliton-similariton laser. Chirped 2-μJ pulses are compressed to 700-fs, 0.5-μJ pulses at 1 MHz. Amplifier output is through a ...
    • Nonlinear laser lithography for enhanced tribological properties 

      Gnilitskyi, I.; Pavlov, Ihor; Rotundo, F.; Orazi, L.; Martini, C.; İlday, Fatih Ömer (IEEE, 2015-05)
      This paper investigates a new field for application of femtosecond laser-induced periodic surface structures (LIPSS). We designed an innovative solution to reduce coefficient of friction of mechanical parts by using the ...
    • Nonlinear laser lithography for photonic design of si solar cells 

      Pavlov, Ihor; Çolakoğlu, T.; Es, F.; Bek, A.; Turan, R.; Gnilitskyi, I.; İlday, F. Ömer (IEEE, 2015)
      Nowadays Si-based solar cell (SC) remains the main source of solar energy in the world due to low cost of material and relatively simple, industrially acceptable technology. Despite of significant progress on increasing ...
    • Nonlinearity management: from fiber oscillators to amplifiers 

      İlday, Fatih Ömer; Şenel, Ç.; Hamid, R.; Teamir, Tesfay G.; Pavlov, Ihor; Teğin, Uğur; Ergeçen, E.; Elahi, Parviz; Iegorov, R. (IEEE, 2016)
      While the standard approach to performance scaling in fiber lasers seeks to reduce nonlinear effects through chirping or mode scaling, I will review recent progress in a complementary approach, whereby the governing dynamics ...
    • Optical waveguides written deep inside silicon by femtosecond laser 

      Pavlov, Ihor; Tokel, Onur; Pavlova, S.; Kadan, V.; Makey, Ghaith; Turnalı, Ahmet; Çolakoğlu, T.; Yavuz, O.; İlday, Fatih Ömer (OSA, 2017)
      Summary form only given. Photonic devices that can guide, transfer or modulate light are highly desired in electronics and integrated silicon photonics. Through the nonlinear processes taking place during ultrafast ...