Now showing items 1-16 of 16

    • 915 nm pumped 1018 nm Yb-doped all-fiber high power fiber laser system 

      Midilli, Yakup; Efunbajo, O. Benjamin; Şimşek, Bartu; Ortaç, Bülend (Institute of Electrical and Electronics Engineers Inc., 2019)
      Fibers lasers have attracted great attention in the last decades and the power scaling has reached tens of kW levels. Especially with the tandem pump configuration, pumping the active medium with a pump laser light instead ...
    • CO2 laser polishing of conical shaped optical fiber deflectors 

      Şimşek, E. U.; Şimşek, B.; Ortaç, B. (Springer Verlag, 2017-06)
      A novel method for polishing conical shaped optical fiber deflectors by modulated CO2 laser exposure is reported. The conical shaped fiber deflector geometry was first formed with rough mechanical polishing, then it was ...
    • Engineering particle trajectories in microfluidic flows using speckle light fields 

      Volpe, G.; Volpe, Giovanni; Gigan, S. (SPIE, 2014)
      Optical tweezers have been widely used in physics, chemistry and biology to manipulate and trap microscopic and nanoscopic objects. Current optical trapping techniques rely on carefully engineered setups to manipulate ...
    • An examination of the effect of polarization on the radiation losses of bent optical fibres 

      Altintas, A.; Tanyer, S. G. (Kluwer Academic Publishers, 1993)
      It has long been recognized that the bending losses in weakly guiding optical fibres are independent of the polarization for large bend radius. Here, we show this fact using the volume equivalent current method. The procedure ...
    • Femtosecond laser fabrication of fiber based optofluidic platform for flow cytometry applications 

      Serhatlioglu, Murat; Elbuken, Çağlar; Ortac, Bülend; Solmaz, Mehmet E. (SPIE, 2017)
      Miniaturized optofluidic platforms play an important role in bio-analysis, detection and diagnostic applications. The advantages of such miniaturized devices are extremely low sample requirement, low cost development and ...
    • High power supercontinuum generation in graded-index multimode fibers 

      Teğin, Uğur; Ortaç, Bülend (Institute of Electrical and Electronics Engineers Inc., 2019)
      Over the years, supercontinuum generation in fibers are studied extensively. Photonic crystal fiber technology detailed these studies by allowing the change of dispersion parameter. Nowadays, multimode fibers attracted ...
    • High-speed 1.55 μm operation of low-temperature-grown GaAs-based resonant-cavity-enhanced p-i-n photodiodes 

      Butun, B.; Biyikli, N.; Kimukin, I.; Aytur, O.; Özbay, Ekmel; Postigo, P. A.; Silveira, J. P.; Alija, A. R. (American Institute of Physics, 2004)
      The 1.55 μm high-speed operation of GaAs-based p-i-n photodiodes was demonstrated and their design, growth and fabrication were discussed. A resonant-cavity-detector structure was used to selectively enhance the photoresponse ...
    • An integrated femtosecond timing distribution system for XFELS 

      Kim, J.; Burnham, J.; Chen, J.; Kartner, F. X.; İlday, Fatih Ömer; Ludwig, F.; Schlarb, H.; Winter, A.; Ferianis, M.; Cheever, D. (Massachusetts Institute of Technology, 2006)
      Tightly synchronized lasers and RF-systems with timing jitter in the few femtoseconds range are necessary sub-systems for future X-ray free electron laser facilities. In this paper, we present an optical-microwave phase ...
    • Investigation of AlGaN buffer layers on sapphire grown by MOVPE 

      Van Gemmern, P.; Dikme, Y.; Bıyıklı, Necmi; Kalisch, H.; Özbay, Ekmel; Jansen, R. H.; Heuken, M. (SPIE, 2004)
      In this work, AlGaN layers were grown on sapphire by metal-organic vapor phase epitaxy (MOVPE) on (0001)-oriented sapphire substrates, with the intention to investigate the effect of varying Al/MO and V/III ratios on the ...
    • Kilometer-long ordered nanophotonic devices by preform-to-fiber fabrication 

      Bayindir, M.; Abouraddy, A.F.; Shapira O.; Viens J.; Saygin-Hinczewski, D.; Sorin, F.; Arnold, J.; Joannopoulos, J. D.; Fink, Y. (Institute of Electrical and Electronics Engineers, 2006)
      A preform-to-flber approach to the fabrication of functional fiber-based devices by thermal drawing in the viscous state is presented. A macroscopic preform rod containing metallic, semiconducting, and insulating constituents ...
    • 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 ...
    • Optical resolution photoacoustic imaging of multiple probes via single fiber laser with independently adjustable parameters 

      Yavaş, S.; Kipergil, E. A.; Uluç, N.; Demirkıran, A.; Kayıkçıoğlu, T.; Salman, H. S.; Karamuk, Şöhret Görkem; Ünlü, M. B.; İlday, Fatih Ömer (OSA, 2017)
      Photoacoustic microscopy (PAM) is a promising imaging modality that combines optical and ultrasound imaging. It combines the advantages of high ultrasonic spatial resolution and high optical contrast. When a short laser ...
    • Plasmonics: merging photonics and electronics at nanoscale dimensions 

      Özbay, Ekmel ((AAAS) American Association for the Advancement of Science, 2006)
      Electronic circuits provide us with the ability to control the transport and storage of electrons. However, the performance of electronic circuits is now becoming rather limited when digital information needs to be sent ...
    • Subnetwork partitioning and section restoration in translucent optical networks 

      Karasan, Ezhan; Arısoylu, M. (SPIE, 2003)
      We discuss the problem of designing translucent optical networks composed of restorable, transparent subnetworks interconnected via transponders. We formulate the problem of designing restorable subnetworks in translucent ...
    • Tapered nanoscale chalcogenide fibers directly drawn from bulk glasses as optical couplers for high-index resonators 

      Aktaş, O.; Bayindir, M. (OSA - The Optical Society, 2017)
      We report production of air-clad tapered chalcogenide fibers by directly drawing bulk glasses between cleaved tips of tapered silica fibers. Exploiting these tapered fibers with nanoscale waists as evanescent optical ...
    • Towards multimaterial multifunctional fibres that see, hear, sense and communicate 

      Abouraddy, A. F.; Bayindir, M.; Benoit, G.; Hart, S. D.; Kuriki, K.; Orf, N.; Shapira, O.; Sorin, F.; Temelkuran, B.; Fink, Y. (Nature Publishing Group, 2007)
      Virtually all electronic and optoelectronic devices necessitate a challenging assembly of conducting, semiconducting and insulating materials into specific geometries with low-scattering interfaces and microscopic feature ...