Now showing items 1-10 of 10

    • Green stimulated emission boosted by nonradiative resonant energy transfer from blue quantum dots 

      Gao, Y.; Yu, G.; Wang Y.; Dang C.; Sum, T. C.; Sun, H.; Demir, H. V. (American Chemical Society, 2016)
      Thanks to their tunability and versatility, the colloidal quantum dots (CQDs) made of II-VI semiconductor compound offer the potential to bridge the "green gap" in conventional semiconductors. However, when the CQDs are ...
    • High-energy femtosecond photonic crystal fiber laser 

      Lecaplain, C.; Ortaç, B.; MacHinet G.; Boullet J.; Baumgart, M.; Schreiber, T.; Cormier, E.; Hideur, A. (2010)
      We report the generation of high-energy high-peak power pulses in an all-normal dispersion fiber laser featuring large-mode-area photonic crystal fibers. The self-starting chirped-pulse fiber oscillator delivers 11 W of ...
    • Investigation of AlGaN buffer layers on sapphire grown by MOVPE 

      Van Gemmern P.; Dikme, Y.; Biyikli, N.; Kalisch H.; Özbay, E.; Jansen, R.H.; Heuken, M. (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 ...
    • Low-threshold optical gain and lasing of colloidal nanoplatelets 

      Kelestemur, Y.; Guzelturk, B.; Olutas, M.; Delikanli, S.; Volkan Demir H. (Institute of Electrical and Electronics Engineers Inc., 2014)
      Semiconductor nanocrystals, which are also known as colloidal quantum dots (CQDs), are highly attractive materials for high performance optoelectronic device applications such as lasers. With their size, shape and composition ...
    • Memory effect by charging of ultra‐small 2‐nm laser‐synthesized solution processable Si‐nanoparticles embedded in Si–Al2O3–SiO2 structure 

      El-Atab, N.; Rizk, A.; Tekcan, B.; Alkis, S.; Okyay, A., K.; Nayfeh, A. (Wiley-VCH Verlag, 2015)
      A memory structure containing ultra-small 2-nm laser-synthesized silicon nanoparticles is demonstrated. The Si-nanoparticles are embedded between an atomic layer deposited high-κ dielectric Al<inf>2</inf>O<inf>3</inf> layer ...
    • Operation of a novel hot electron vertical cavity surface emitting laser 

      Balkan, N.; O'Brien-Davies, A.; Thoms, A. B.; Potter, R. J.; Poolton, N.; Adams, M. J.; Masum J.; Bek, A.; Serpenguzel, A.; Aydinli, A.; Roberts J. S. (SPIE - The International Society for Optical Engineering, 1998-01)
      The hot Electron Light Emission and Lasing in Semiconductor Heterostructures devices (HELLISH-1) is novel surface emitter consisting of a GaAs quantum well, within the depletion region, on the n side of Ga 1-xAlxAs p- n ...
    • Photoluminescence from a VCSEL structure a-SiNx:H microcavity 

      Serpengüzel, A.; Darici, Y. (IEEE, 1999)
      Microcavity effects on the photoluminescence (PL) of porous Si has already been reported. Recently, we have observed visible and near infrared (IR) PL from hydrogenated amorphous Si nitride (a-SiNx:H) grown by low temperature ...
    • Power saturation in standard and double-AR unfolded laser diode cavities 

      Peters M.G.; Fily A.; Rossin V.; Demir A. (Institute of Electrical and Electronics Engineers Inc., 2016)
      We report modeling and experimental results that demonstrate mechanisms limiting the output power of broad area semiconductor lasers. The modeling comprises numerical simulations of the laser cavity with evolution of ...
    • Sub-80 fe dissipative soliton large-mode-area fiber laser 

      Baumgartl, M.; Ortaç, B.; Lecaplain, C.; Hideur, A.; Limpert J.; Tünnermann, A. (2010)
      We report on high-energy ultrashort pulse generation from an all-normal-dispersion large-mode-area fiber laser by exploiting an efficient combination of nonlinear polarization evolution (NPE) and a semiconductor-based ...
    • Ultralow-threshold up-converted lasing in oligofluorenes with tailored strong nonlinear absorption 

      Guzelturk, B.; Kanibolotsky, A.L.; Orofino-Pena, C.; Laurand, N.; Dawson, M.D.; Skabara P.J.; Demir, H. V. (Royal Society of Chemistry, 2015)
      Nonlinear optical response in organic semiconductors has been an attractive property for many practical applications. For frequency up-converted lasers, to date, conjugated polymers, fluorescent dyes and small organic ...