Now showing items 1-20 of 23

    • 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 ...
    • 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 ...
    • 50-W, 1.6-GHz pulse repetition rate from a burst-mode Yb-doped fiber laser 

      Elahi, Parviz; Ertek, A. C.; Eken, K.; İlday, Fatih Ömer (IEEE, 2017)
      We report a 50-W average power Yb-doped fiber laser amplifier system. The laser system produces bursts at a minimum rate of 200 kHz, with 1.6 GHz intraburst repetition rate. The total energy delivers in a burst is 250 μJ ...
    • Ablation-cooled material removal at high speed with femtosecond pulse bursts 

      Kerse, Can; Kalaycıoğlu, Hamit; Elahi, Parviz; Akçaalan, Önder; Yavaş, S.; Aşık, M. D.; Kesim, Deniz Koray; Yavuz, Koray; Çetin, Barbaros; İlday, Fatih Ömer (OSA, 2015)
      We report exploitation of ablation cooling, a concept well-known in rocket design, to remove materials, including metals, silicon, hard and soft tissue. Exciting possibilities include ablation using sub-microjoule pulses ...
    • Applying the principle of orthogonality of high dimensional random vectors to obtain high-density, large-volume 3D holographic display 

      Makey, Ghaith; Yavuz, Özgün; Kesim, Denizhan Koray; Turnalı, Ahmet; Elahi, Parviz; Toumi, J.; El-Daher, M. S.; Ilday, Serim; Tokel, Onur; İlday, F. Ömer (OSA, 2018)
      The efforts toward truly 3D displays are far from exploiting the full potential of holography. Here, we apply the principle of orthogonality of high dimensional random vectors to obtain unprecedented dense, large volume holograms.
    • Breaking crosstalk limits to dynamic holography using orthogonality of high-dimensional random vectors 

      Makey, Ghaith; Yavuz, Özgün; Kesim, Denizhan K.; Turnalı, Ahmet; Elahi, Parviz; İlday, Serim; Tokel, Onur; İlday, F. Ömer (Nature Publishing Group, 2019)
      Holography is the most promising route to true-to-life three-dimensional (3D) projections, but the incorporation of complex images with full depth control remains elusive. Digitally synthesized holograms1,2,3,4,5,6,7, which ...
    • Buried waveguides written deep inside silicon 

      Turnalı, Ahmet; Tokel, Onur; Kesim, Denizhan Koray; Makey, Ghaith; Elahi, Parviz; İlday, Fatih Ömer (OSA, 2017)
      Summary form only given. Silicon waveguides are widely used as optical interconnects and they are particularly important for Si-photonics. Si-based devices, along with other optical elements, are entirely fabricated on the ...
    • Compact 1.5-GHz intra-burst repetition rate Yb-doped all-PM-fiber laser system for ablation-cooled material removal 

      Akçaalan, Önder; Kalaycıoğlu, Hamit; Elahi, Parviz; Deminskyi, Petro; İlday, Fatih Ömer (OSA, 2017)
      Summary form only given. Femtosecond (fs) 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, ...
    • Controlling active brownian particles in complex settings 

      Velu, Sabareesh K. P.; Pinçe, Erçağ; Callegari, Agnese; Elahi, Parviz; Gigan, S.; Volpe, Giovanni; Volpe, G. (OSA, 2017)
      We show active Brownian particles (passive Brownian particles in a bacterial bath) switches between two long-term behaviors, i.e. gathering and dispersal of individuals, in response to the statistical properties of the ...
    • Dissipative solitons generated from a mode-locked Raman laser 

      Teğin, Uğur; Elahi, Parviz; Şenel, Ç.; Ergeçen, Emre; İlday, F. Ömer (IEEE, 2015)
      Stolen, et al. introduced synchronously pumped oscillators where gain was achieved through stimulated Raman scattering (SRS) as a method to reach wavelengths outside of the limited range covered by laser gain media [1]. ...
    • Generation of dissipative solitons in normal-dispersion Raman fiber laser 

      Teğin, Uğur; Elahi, Parviz; Şenel, Ç.; Ergeçen, E.; İlday, Fatih Ömer (IEEE, 2016)
      Dissipative soliton pulses in a synchronously pumped all-normal-dispersion Raman fiber laser is presented theoretically and experimentally. The laser generates 7.1 nJ intra-cavity pulses at 1.12 μm and is compressed to 136 fs.
    • High energy dissipative raman soliton laser through XPM stabilization 

      Ergeçen, E.; Tegin, Uğur; Elahi, Parviz; Şenel, Ç.; İlday, F. Ömer (Optical Society of America (OSA), 2015-10)
      Dispersion, nonlinearity and gain determine the intracavity pulse behaviour. We show that pump depletion and XPM play a significant role in the stabilization of high energy dissipative Raman solitons. Using this theoretical ...
    • 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 ...
    • Influence of modulation of pump and seed signals on fiber amplification of broadband pulses 

      Gürel, Kutan; Elahi, Parviz; Budunoğlu, İbrahim Levent; Şenel, Çağrı; Paltani, Punya Prasanna; İlday, Fatih Ömer (OSA, 2011)
      We report on characterization of the transfer of pump and seed signal modulations, including noise, during fiber amplification. We demonstrate experimentally and theoretically that pump (signal) modulations are transferred ...
    • Influence of pump noise on mode-locked fiber oscillators 

      Teamir, Tesfay G.; Elahi, Parviz; Budunoğlu, İbrahim Levent; Gürel, Kutan; İlday, Fatih Ömer (OSA, 2015)
      Pump modulation transfer function (MTF), and its dependence on pump power are investigated for all normal dispersion, dispersion managed and soliton-like mode-locked oscillator both in experiment and simulation. We find ...
    • Intracavity optical trapping of microscopic particles in a ring-cavity fiber laser 

      Kalantarifard, Fatemeh; Elahi, Parviz; Makey, Ghaith; İlday, F. Ömer; Volpe, Giovanni; Maragò, O. M. (Nature Publishing Group, 2019-06)
      Standard optical tweezers rely on optical forces arising when a focused laser beam interacts with a microscopic particle: scattering forces, pushing the particle along the beam direction, and gradient forces, attracting ...
    • 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 ...
    • Theoretical analysis of doping management 

      Gürsel, A. T.; Elahi, Parviz; İlday, F. Ömer; Ozyazici, M.S. (IEEE, 2013)
      Two opposing requirements, such as thermal load and nonlinear effects are important limitations in rapid progress of high-power fiber laser technologies. Thermal effects, which limit the average power, can be minimized by ...