Papers by Piotr Wasylczyk
Acta Physica Polonica Series a, 1999
ABSTRACT
Http Dx Doi Org 10 1080 09500340701432599, Dec 2, 2010
Optics Letters, Jan 15, 2004
We have developed a deformable, gold-coated mirror based on piezoelectric actuators with 15-μs re... more We have developed a deformable, gold-coated mirror based on piezoelectric actuators with 15-μs response time. With 20 independent channels we were able to compress 72-fs pulses from a Ti:sapphire oscillator down to 45 fs in a 4f zero-dispersion compressor arrangement. Spectral interference was used to measure the mirror performance, while the spectral phase interferometry for direct electric field reconstruction (SPIDER) technique was used for the laser pulse characterization.
Proceedings of Spie the International Society For Optical Engineering, 2006
We present experimental realization of nonlinear and highly birefringent microstructure fiber fab... more We present experimental realization of nonlinear and highly birefringent microstructure fiber fabricated from silicate glass. Using full vector FEM mode solver the numerical analysis of reported fiber is performed and its modal, polarization and dispersive properties are investigated. Particularly, the calculations reveals guidance of two orthogonally polarized eigenmodes with the difference of its effective indexes B=0.0025 for wavelength λ=1.55 μm. Additionally, spectral broadening of the 50 fs Ti:Sapphire laser impulses with average power 150mW coupled into 39 cm section of the fiber is observed.
Physical Review Letters, Apr 4, 2008
We present an experimental demonstration of heralded single photons prepared in pure quantum stat... more We present an experimental demonstration of heralded single photons prepared in pure quantum states from a parametric down-conversion source. It is shown that, through controlling the modal structure of the photon pair emission, one can generate pairs in factorable states and thence eliminate the need for spectral filters in multiple-source interference schemes. Indistinguishable heralded photons were generated in two independent spectrally engineered sources and Hong-Ou-Mandel interference observed between them without spectral filters. The measured visibility of 94.4% sets a minimum bound on the mean photon purity.
Ultrafast Phenomena in Semiconductors VII, 2003
ABSTRACT
Nonlinear Optics Applications, 2005
We present an experimental and theoretical study of the nonlinear propagation of 90 fs laser puls... more We present an experimental and theoretical study of the nonlinear propagation of 90 fs laser pulses at 800 nm in bulk fused silica. An unexpected behavior of the off-axis emission for pulse energy corresponding to the supercontinuum generation threshold has been discovered. Our model, based on 3D Nonlinear Schrodinger Equation, well explains the observed nonlinear dynamics. For the first time we experimentally confirm that the onset of the supercontinuum generation is inevitably accompanied by the pulse collapse in transverse dimensions.
Laser Technology 2012: Progress in Lasers, 2013
Conference on Coherence and Quantum Optics, 2007
IV Workshop on Atomic and Molecular Physics, 2003
ABSTRACT
Optics express, Jan 23, 2015
We demonstrate a photonic structure, composed of a dielectric quarter-wavelength stack topped wit... more We demonstrate a photonic structure, composed of a dielectric quarter-wavelength stack topped with a transmission phase grating, designed to exhibit a significant asymmetry in the near infrared light transmission for waves propagating in opposite directions. The asymmetry, defined as the difference between the intensity transmission coefficients, reaches 0.72 ± 0.06 for a single wavelength and exceeds 0.2 over a spectral range spanning from 700 to 850 nm for one incident polarization and 750-800 nm for both polarizations. The experimental results are consistent with the numerical model of light propagation in the structure.
Photonics Letters of Poland, 2014
Photonic Crystal Materials and Devices III, 2006
We present experimental realization of nonlinear and highly birefringent microstructure fiber fab... more We present experimental realization of nonlinear and highly birefringent microstructure fiber fabricated from silicate glass. Using full vector FEM mode solver the numerical analysis of reported fiber is performed and its modal, polarization and dispersive properties are investigated. Particularly, the calculations reveals guidance of two orthogonally polarized eigenmodes with the difference of its effective indexes B=0.0025 for wavelength lambda=1.55 mum.
Integrated Photonics Research and Applications/Nanophotonics, 2006
Optics InfoBase is the Optical Society's online library for flagship journals, partn... more Optics InfoBase is the Optical Society's online library for flagship journals, partnered and copublished journals, and recent proceedings from OSA conferences.
Ultrakurze optische Pulse sind in vielen Bereichen ein zunehmend wichti-ges Werkzeug. Manchmal si... more Ultrakurze optische Pulse sind in vielen Bereichen ein zunehmend wichti-ges Werkzeug. Manchmal sind die extrem hohen elektrischen Feldstärken der Pulse nützlich, während unter anderen Umständen die Pulsdauer selbst entscheidend ist. In beiden Fällen gilt: Kann man das elektrische Feld des Pulses in seinem zeitlichen Verlauf (oder frequenzabhängig) vollständig cha-rakterisieren, dann erweitert dies den Wirkungsbereich von Techniken zur Beschreibung ultraschneller Phänomene. So lassen sich nicht nur völlig neu-artige Experimente durchführen, sondern auch die Reichweite und Zuver-lässigkeit konventioneller optischer Ultrakurzpuls-Techniken vergrößern. Der weit verbreitete Einsatz ultraschneller Technologien in Physik, Chemie, Biologie und Medizin sowie ihre Schlüsselrolle in zahlreichen praktischen Anwendungen verlangt nach der Entwicklung von Instru-menten zur Puls-Charakterisierung, die mindestens so stabil sind wie die derzeiti-gen Laserquellen. Diese Messgeräte sollten hochempfi nd...
Lecture Notes in Computer Science, 2014
ABSTRACT This paper reports on a successful application of evolutionary computation techniques to... more ABSTRACT This paper reports on a successful application of evolutionary computation techniques to the computer aided design of a dedicated highly dispersive mirror which is used in an ultrafast laser. The mirror is a GaAs plate coated with many interleaving layers of GaAs/AlAs and SiO2/Si3N4 layers whose thickness undergo optimization. We report and compare results obtained by leading global optimization techniques: Covariance Matrix Adaptation Evolution Strategy and Differential Evolution, as well as few efficient local optimization methods: Nelder-Mead and variable metric. The evolutionary designed mirror has been manufactured by the Molecular Beam Epitaxy technology and the measurements confirmed successful implementation of the instrument.
Conference on Quantum Electronics and Laser Science (QELS) - Technical Digest Series, 2007
Parametric downconversion in KDP provides a method of producing heralded single photons in pure s... more Parametric downconversion in KDP provides a method of producing heralded single photons in pure states. We present the theory behind this technique and our most recent experimental results.
Optics Express, 2014
We present a simple broadband gradient-index antireflective coating, fabricated directly on a sin... more We present a simple broadband gradient-index antireflective coating, fabricated directly on a single mode telecom fiber tip. A regular array of hemi-ellipsoidal protrusions significantly reduce the Fresnel reflection from the glass-air interface. The parameters of the structure were optimized with numerical simulation for the best performance at and around 1550 nm and the coating was fabricated with Direct Laser Writing. The measured reflectance decreased by a factor of 30 at 1550 nm and was below 0.28% for the 100 nm spectral band around the central wavelength. Compared to quarter wavelength antireflective coatings the demonstrated approach offers significantly reduced technological challenges, in particular processing of a single optical material with low sensitivity to imperfections in the fabrication process.
Optics Express, 2014
The optimized nonuniform growth process was used to achieve spatially dependent reflectivity and ... more The optimized nonuniform growth process was used to achieve spatially dependent reflectivity and dispersions characteristics in a highly dispersive semiconductor mirror. The mirror, together with a semiconductor saturable absorber mirror (SESAM), was used to demonstrate a tunable femtosecond Yb:KYW oscillator. In the passive modelocking regime the laser could be continuously tuned over 3.5 nm spectral band around 1032 nm with high resolution, maintaining the average output power above 140 mW.
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Papers by Piotr Wasylczyk