Ole Bang

Technical University of Denmark

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Christian Petersen

Northwestern University

107

Christos Markos

Technical University of Denmark

Getinet Woyessa

Technical University of Denmark

Kristian Nielsen

Technical University of Denmark

Wiesław Królikowski

Australian National University

Morten Bache

Technical University of Denmark

Niels Møller Israelsen

Technical University of Denmark

Henrik Koblitz Rasmussen

Technical University of Denmark

Peter M. Moselund

NKT Holding (Denmark)

Peter M. Moselund

NKT Holding (Denmark)

Cooperative Institutions

Technical University of Denmark

193

Ørsted (Denmark)

Optica

Centre National de la Recherche Scientifique

NKT Holding (Denmark)

University of Copenhagen

International Society for Optics and Photonics

Australian National University

Photonics (United States)

Centre for Ultrahigh Bandwidth Devices for Optical Systems

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Asymmetric Induced Cubic Nonlinearities in Homogeneous And Quasi-Phase-Matched Quadratic Materials: Signature and Importance

Optics and Photonics News (2001)

Ole Bang J. F. Corney

Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text Ole Bang and Joel F. Corney, "Asymmetric Induced Cubic Nonlinearities in Homogeneous And Quasi-Phase-Matched Quadratic Materials: Signature and Importance," Optics & Photonics News 12(12), 42-42 (2001) Export Citation BibTex Endnote (RIS) HTML Plain Text Citation alert Save article

Signature (topology)

10.1364/opn.12.12.000042

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Citations (7)

Polymer Optical Fiber Tip Mass Production Etch Mechanism to Achieve CPC Shape for Improved Biosensor Performance

Sensors (2019)

Hafeez Ul Hassan Ole Bang Jakob Janting

We report on a simple chemical etching method that enables nonlinear tapering of Polymer Optical Fiber (POF) tips to manufacture Compound Parabolic Concentrator (CPC) fiber tips. We show that, counter-intuitively, nonlinear tapering can be achieved by first etching the core and not the cladding. The etching mechanism is modelled and etched tips are characterized both geometrically and optically in a fluorescence glucose sensor chemistry. A Zemax model of the CPC tipped sensor predicts an optimal improvement in light capturing efficiency of a factor of 3.96 compared to the conventional sensor with a plane-cut fiber tip. A batch of eight CPC fiber tips has been manufactured by the chemical etching method. The batch average showed an increase of a factor of 3.16, which is only 20% less than the predicted value. The method is reproducible and can be up-scaled for mass production.

Tapering

Cladding (metalworking)

Zemax

Isotropic etching

10.3390/s19020285

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Citations (9)

Enhanced Soliton Self-Frequency Shift in a Longitudinally Varying Taper

A. C. Judge Ole Bang Benjamin J. Eggleton Boris T. Kuhlmey Eric Mägi

We propose a method for the enhancement of the soliton self-frequency shift in a tapered PCF with a carefully designed waist diameter profile which optimises the dispersion and nonlinearity at the soliton wavelength.

Frequency shift

Self-phase modulation

10.1364/fio.2009.ftud4

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Citations (1)

Nonlocal incoherent solitons

Physical Review E (2004)

Wiesław Królikowski Ole Bang John Wyller

We investigate the propagation of partially coherent beams in spatially nonlocal nonlinear media with a logarithmic type of nonlinearity. We derive analytical formulas for the evolution of the beam parameters and conditions for the formation of nonlocal incoherent solitons.

10.1103/physreve.70.036617

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Citations (70)

Zeonex Microstructured Polymer Optical Fibre Bragg Grating Sensor

Getinet Woyessa Andrea Fasano Christos Markos Henrik Koblitz Rasmussen Ole Bang

We fabricated an endlessly single mode and humidity insensitive Zeonex microstructured polymer optical fibre (mPOF) for fibre Bragg grating (FBG) temperature and strain sensors. We inscribed and characterise FBGs in Zeonex mPOF for the first time.

Fiber Bragg Grating

PHOSFOS

Subwavelength-diameter optical fibre

Microstructured optical fiber

Inscribed figure

10.1364/acoft.2016.aw3c.4

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Citations (3)

All-depth dispersion cancellation in spectral domain optical coherence tomography using numerical intensity correlations

arXiv (Cornell University) (2018)

Mikkel Jensen Niels Møller Israelsen Michaël Maria Thomas Feuchter Adrian Gh. Podoleanu

In ultra-high resolution (UHR-) optical coherence tomography (OCT) group velocity dispersion (GVD) must be corrected for in order to approach the theoretical resolution limit. One approach promises not only compensation, but complete annihilation of even order dispersion effects, and that at all sample depths. This approach has hitherto been demonstrated with an experimentally demanding 'balanced detection' configuration based on using two detectors. We demonstrate intensity correlation (IC) OCT using a conventional spectral domain (SD) UHR-OCT system with a single detector. IC-SD-OCT configurations exhibit cross term ghost images and a reduced axial range, half of that of conventional SD-OCT. We demonstrate that both shortcomings can be removed by applying a novel generic artefact reduction algorithm and using analytic interferograms. We show the superiority of IC-SD-OCT compared to conventional SD-OCT by showing how IC-SD-OCT is able to image spatial structures behind a strongly dispersive silicon wafer. Finally, we question the resolution enhancement of square root 2 that IC-SD-OCT is often believed to have compared to SD-OCT. We show that this is simply the effect of squaring the reflectivity profile as a natural result of processing the product of two intensity spectra instead of a single spectrum.

10.48550/arxiv.1802.01313

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Supercontinuum generation in untapered and tapered photonic crystal fibers with two zero dispersion wavelengths

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2005)

Michael H. Frosz Peter Falk Lars Thorslund Pedersen Ole Bang Anders Bjarklev

Supercontinuum generation in photonic crystal fibers with two zero dispersion wavelengths (ZDWs) is investigated numerically. The role of the second ZDW is examined for 5 fiber designs where the higher ZDW differs while the lower ZDW is almost the same for all fibers. We find that tapering can arrest pump depletion, thereby improving the flatness and bandwidth of the supercontinuum. Pumping with low-power picosecond pulses is also investigated; we find that the low peak power leads to a broad four-wave mixing gain bandwidth, resulting in a supercontinuum that is extremely flat over almost 500 nm.

Supercontinuum

Zero-dispersion wavelength

Picosecond

10.1117/12.601185

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Citations (1)

Nonlocal Gap Solitons in Infiltrated Photonic Crystal Fibres

Frontiers in Optics 2008/Laser Science XXIV/Plasmonics and Metamaterials/Optical Fabrication and Testing (2008)

Francis Bennet Per Rasmussen Christian R. Rosberg Andrey A. Sukhorukov Ole Bang

We report on the first observation of nonlocal discrete gap solitons in infiltrated photonic crystal fibres. We employ the thermal defocusing nonlinearity of the liquid to study the soliton properties and the effects of boundaries of the periodic structure.

10.1364/fio.2008.fwl5

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Supercontinuum Generation in Fibers Infiltrated with Liquid Crystals

International Conference on Transparent Optical Networks (2006)

Per Rasmussen Ole Bang Jesper Lægsgaard Karsten Rottwitt

Supercontinuum generation in a capillary tube infiltrated with a nematic liquid crystal is investigated theoretically in the near infrared region. A liquid crystal with a high electronic nonlinearity is chosen, which makes it possible to generate 100 nm wide supercontinua using IO ps pulses with peak power 1.5 kW in a 10 cm long waveguide. The possibility of tuning the spectrum of the generated Supercontinuum by changing the dispersion of the waveguide is also considered. It is found that the broadening of the spectrum in both the normal and anomalous regime is mainly due to self phase modulation, and therefore the dispersion of the waveguide is only of minor importance. The tuning of the dispersion is achieved by varying the temperature of the liquid crystal inside the capillary

Supercontinuum

Waveguide

Self-phase modulation

10.1109/icton.2006.248321

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Time-dependent variation of fiber Bragg grating reflectivity in PMMA-based polymer optical fibers

Optics Letters (2015)

D. Sáez‐Rodríguez K. Nielsen Ole Bang D. J. Webb

In this Letter, we investigate the effects of viscoelasticity on both the strength and resonance wavelength of two fiber Bragg gratings (FBGs) inscribed in microstructured polymer optical fiber (mPOF) made of undoped PMMA. Both FBGs were inscribed under a strain of 1% in order to increase the material photosensitivity. After the inscription, the strain was released, and the FBGs spectra were monitored. We initially observed a decrease of the reflection down to zero after which it began to increase. After that, strain tests were carried out to confirm the results, and finally the gratings were monitored for a further 120 days, with a stable reflection response being observed beyond 50 days.

Fiber Bragg Grating

PHOSFOS

Long-period fiber grating

Reflection

10.1364/ol.40.001476

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Citations (14)