Now showing items 1-18 of 18

    • Ablation-cooled material removal at high speed with femtosecond pulse bursts 

      Kerse, C.; Kalaycioglu H.; Elahi P.; Akcaalan Ö.; Yavaş, S.; Aşik, M.D.; Kesim, D.K.; Yavuz, K.; Çetin, B.; Ilday F.Ö. (Optical Society of America (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 ...
    • Advances in femtosecond single-crystal sum-frequency generating optical parametric oscillators 

      Köprülü, K, G.; Kartaloğlu, T; Dikmelik, y.; Aytür, O. (IEEE, Piscataway, NJ, United States, 1998)
      The effect of compensating the group velocity mismatch between the orthogonal pump components on the conversion efficiency of the optical parametric oscillators (OPOs) was investigated. A femtosecond single-crystal ...
    • All-fiber, single-mode spectral beam combining of high power Tm-doped fiber lasers 

      Yilmaz, S.; Ottenhues, C.; Wysmolek, M.; Theeg, T.; Lamrini, S.; Scholle, K.; Fuhrberg P.; Sayinc H.; Ilday F.Ö.; Neumann J.; Overmeyer L.; Kracht, D. (Optical Society of America (OSA), 2015)
      Signal beam combining of Tm-doped fiber lasers can increase the laser output power while simultaneously maintaining the single mode beam quality. We demonstrate an all-fiber integrated dual-wavelength Tm-doped fiber laser ...
    • Femtosecond pulse generation from an extended cavity Cr4+: Forsterite laser using graphene on YAG 

      Baylam I.; Ozharar, S.; Natali Cizmeciyan, M.; Balci O.; Pince, E.; Kocabas, C.; Sennaroglu, A. (2013)
      A room temperature, multipass-cavity, femtosecond Cr4+:forsterite laser was modelocked with a single-layer graphene saturable absorber on a YAG substrate. The resonator produced nearly transform-limited 92 fs pulses near ...
    • Focus issue introduction: Advanced Solid-State Lasers (ASSL) 2014 

      Schepler, K.L.; Jeong, Y.; Jiang, S.; Gallo, K.; Taira, T.; Omer Ilday F. (Optical Society of American (OSA), 2015)
      The editors introduce the focus issue on "Advanced Solid-State Lasers (ASSL) 2014," which is based on the topics presented at a congress of the same name held in Shanghai, China, from October 27 to November 1, 2014. This ...
    • Focus issue introduction: Advanced Solid-State Lasers (ASSL) 2015 

      Gallo K.; Jeong Y.; Taira T.; Jiang S.; Ilday, F. O. (OSA - The Optical Society, 2016)
      The editors introduce the focus issue on "Advanced Solid-State Lasers (ASSL) 2015", which is based on the topics presented at a congress of the same name held in Berlin, Germany, from October 4 to October 9, 2015. This ...
    • Generation of Sub-20-fs Pulses From a Graphene Mode-Locked Laser 

      Canbaz, F.; Kakenov, N.; Kocabas, C.; Demirbas, U.; Sennaroglu, A. (OSA - The Optical Society, 2017)
      We demonstrate, what is to our knowledge, the shortest pulses directly generated to date from a solid-state laser, mode locked with a graphene saturable absorber (GSA). In the experiments, a low-threshold diode-pumped ...
    • Graphene mode-locked femtosecond Cr: LiSAF laser 

      Canbaz F.; Kakenov, N.; Kocabas, C.; Demirbas, U.; Sennaroglu, A. (Optical Society of America (OSA), 2015)
      We report the first demonstration of femtosecond pulse generation from a Cr:LiSAF laser mode-locked with a monolayer graphene saturable absorber. Nearly transform-limited 72-fs pulses were generated at 850 nm with only two ...
    • Graphene supercapacitor as a voltage controlled saturable absorber for femtosecond pulse generation 

      Baylam I.; Natali Cizmeciyan, M.; Ozharar, S.; Ozan Polat, E.; Kocabas, C.; Sennaroglu, A. (Optical Society of American (OSA), 2014)
      For the first time to our knowledge, we employed a graphene supercapacitor as a voltage controlled saturable absorber at bias voltages of 0.5-1V to generate 84-fs pulses from a solid-state laser near 1255 nm. © 2014 OSA.
    • Graphene-gold supercapacitor as a voltage-controlled saturable absorber for femtosecond pulse generation 

      Baylam, I.; Balci, O.; Kakenov, N.; Kocabas, C.; Sennaroglu, A. (Optical Society of America, 2015)
      We report, for the first time to our knowledge, a voltage-controlled graphene-gold supercapacitor saturable absorber, as a modulator with adjustable insertion loss for low-gain mode-locked lasers. Nearly transform-limited, ...
    • High energy dissipative raman soliton laser through XPM stabilization 

      Ergeçen, E.; Tegin, U.; Elahi P.; Şenel Ç.; Ilday F.Ö. (Optical Society of America (OSA), 2015)
      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 ...
    • High-speed transparent indium-tin-oxide based resonant cavity Schottky photodiode with Si/sub 3/N/sub 4//SiO/sub 2/ top Bragg mirror 

      Biyikli, N.; Kimukin, I.; Aytur, O.; Ozbay, E.; Gokkavas, M.; Unlu, S. (IEEE, Piscataway, NJ, United States, 2000)
      Photodetectors demonstrating high bandwidth-efficiency (BWE) products are required for high-performance optical communication and measurement systems. For conventional photodiodes the BWE product is limited due to the ...
    • Influence of pump noise on mode-locked fiber oscillators 

      Teamir, T.G.; Elahi, P.; Budunoglu I.L.; Gürel, K.; Ilday F.Ö. (Optical Society of America (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 ...
    • Innovative laser sources operating around 2 μm 

      Kracht D.; Sayinc H.; Yilmaz S.; Wysmolek M.; Hausmann K.; Ottenhues C.; Wandt D.; Wienke A.; Neumann J. (Elsevier B.V., 2016)
      We report on a variety of continuous wave and pulsed laser sources based on Thulium- and Holmium-doped materials, emitting in the spectral range around 2 μm. This includes continuous wave Thulium-doped fiber lasers which ...
    • Nonlinearity management of fiber oscillator with multiple gain segments 

      Teamir, T.G.; Ilday F.Ö. (Optical Society of America (OSA), 2015)
      Oscillator with two gain segments is used to manage nonlinearity level and distribution. Results suggest that pulse evolution subject to an effective negative nonlinearity arising from complex interaction of gain filtering, ...
    • Phase-matched self-doubling optical parametric oscillator 

      Kartaloğlu, T.; Köprülü, K. G.; Aytür, O. (Optical Society of America, 1997-03-01)
      We report a synchronously pumped intracavity frequency-doubled optical parametric oscillator that employs a single KTiOPO4 crystal for both parametric generation and frequency doubling. Both nonlinear processes are phase ...
    • Simultaneous phase matching of optical parametric oscillation and second-harmonic generation in aperiodically poled lithium niobate 

      Kartaloğlu, T.; Figen, Z. G.; Aytür, O. (Optical Society of American (OSA), 2003)
      We report a simple ad hoc method for designing an aperiodic grating structure to quasi-phase match two arbitrary second-order nonlinear processes simultaneously within the same electric-field-poled crystal. This method ...
    • Single-crystal sum-frequency-generating optical parametric oscillator 

      Köprülü, K. G.; Kartaloğlu, T.; Dikmelik, Y.; Aytür, O. (Optical Society of America, 1999-09)
      We report a synchronously pumped optical parametric oscillator that generates the sum frequency of the pump and the signal wavelengths. A single KTiOPO4 (KTP) crystal is used for both parametric generation and sum-frequency ...