Now showing items 1-11 of 11

    • 83 W, 1 ns, 3.1 MHz all-fiber laser for micromachining 

      Özgören, Kıvanç; Öktem, Bülent; Yılmaz, Sinem; İlday, F. Ömer; Pasin, E.; Eken, K. (IEEE, 2011)
      Fiber lasers are commonly used for various material processing applications. The advantages (such as simplicity of the system, high material removal rate) and disadvantages (larger heat-affected zone, reduced precision) ...
    • 83 W, 3.1 MHz, square-shaped, 1 ns-pulsed all-fiber-integrated laser for micromachining 

      Özgören, Kıvanç; Öktem, Bülent; Yılmaz, Sinem; İlday, F. Ömer; Eken, K. (Optical Society of America, 2011-08-29)
      We demonstrate an all-fiber-integrated laser based on off-the-shelf components producing square-shaped, 1 ns-long pulses at 1.03 mu m wavelength with 3.1 MHz repetition rate and 83 W of average power. The master-oscillator ...
    • All-fiber high-energy yb-doped fiber amplifier 

      Öktem, Bülent; Kalaycioǧlu, Hamit; İlday, F. Ömer (IEEE, 2009)
      We report a robust, all-fiber amplifier seeded by a fiber oscillator. Seed pulses at 1 MHz repetition rate are amplified up to 3 μJ, delivering 1 μJ-energy, 170 fs-long pulses. Duration reduces to 120 fs at 1 μJ amplifier ...
    • Engineering the nonlinear dynamics of photonic systems : demonstration of the soliton-similariton fiber laser and nonlinear laser lithography 

      Öktem, Bülent (Bilkent University, 2013)
      Nonlinear effects easily and unavoidably arise in ultrafast optics, often acting as sources of limitation to performance. However, many fascinating phenomena, from generation to utilization of ultrashort laser pulses ...
    • Femtosecond laser-induced TiO2 nano structures on titanium 

      Öktem, Bülent; Kalaycıoğlu, Hamit; İlday, F. Ömer (Optical Society of America, 2010)
      We report formation of polarization-dependent nanostructures (nanolines, nanocircles) by high repetition-rate femtosecond laser pulses on titanium surface through a novel mechanism, converting Ti to TiO2. Arbitrarily ...
    • Micromachining with square-Shaped 1 ns-Long pulses from an all-Fiber Yb-Doped laser-Amplifier system 

      Özgören, Kıvanç; Öktem, Bülent; İlday, F. Ömer; Pasin, Ece; Eken, K. (Optical Society of America, 2011)
      We demonstrate micromachining with 1ns-long pulses from an all-fiber laser. Fiber lasers generating uncompressible long pulses have been ignored as undesired operational modes, however their robust, low-repetition-rate ...
    • 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 ...
    • Nonlinearity engineering of mode-locked fiber lasers: Similariton and soliton-similariton lasers 

      İlday F. Ömer; Öktem, Bülent; Ülgüdür, Coşkun (IEEE, 2011)
      Fiber lasers are attractive with their simplicity, high powers and low cost. However, propagation of short pulses in optical fiber leads to nonlinear effects, which limit the technical performance. These effects drive rich ...
    • Soliton-similariton fibre laser 

      Öktem, Bülent; Ülgüdür, Coşkun; İlday, F. Ömer (Macmillan Publishers, 2010-03-21)
      Rapid progress in passively mode-locked fibre lasers is currently driven by the recent discovery of new mode-locking mechanisms, namely, the self-similarly evolving pulse (similariton) and the all-normal-dispersion ...
    • Spectrally breathing femtosecond pulses from an Er-doped fiber laser 

      Öktem, Bülent; Ülgüdür, Coşkun; İlday, Fatih Ömer (IEEE, 2008)
      We report order-of-magnitude spectral breathing in a dispersion-managed Er-fiber laser with an intracavity bandpass filter. This is to our knowledge the highest of any laser reported. Pulse energy is 1.7 nJ, width is 110 fs.
    • Surface texturing of dental implant surfaces with an ultrafast fiber laser 

      Öktem, Bülent; Kalaycıoğlu, Hamit; Erdoǧan, M.; Yavaş, S.; Mukhopadhyay P.; Tazebay, Uygar Halis; Aykaç, Y.; Eken, K.; İlday, F. Ömer (Optical Society of America, 2010)
      Controlled modification of implant surfaces using femtosecond, picosecond and nanosecond pulses from home-built all-fiber-integrated lasers is demonstrated. Picosecond and femtosecond pulses offer superior control over the ...