G
G. Ahmed
Researcher at Max Planck Society
Publications - 16
Citations - 556
G. Ahmed is an academic researcher from Max Planck Society. The author has contributed to research in topics: Photonic-crystal fiber & Optical fiber. The author has an hindex of 6, co-authored 16 publications receiving 430 citations.
Papers
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Journal ArticleDOI
Broadband robustly single-mode hollow-core PCF by resonant filtering of higher-order modes.
P. Uebel,M. C. Günendi,Michael H. Frosz,G. Ahmed,N. N. Edavalath,Jean-Michel Ménard,Philip St. J. Russell +6 more
TL;DR: A hollow-core photonic crystal fiber that is engineered so as to strongly suppress higher-order modes, i.e., to provide robust LP01 single-mode guidance in all the wavelength ranges where the fiber guides with low loss is reported.
Journal ArticleDOI
Orbital-angular-momentum-preserving helical Bloch modes in twisted photonic crystal fiber
X. M. Xi,Gordon K. L. Wong,Michael H. Frosz,Fehim Babic,G. Ahmed,Xin Jiang,Tijmen G. Euser,P. St. J. Russell +7 more
TL;DR: In this article, the authors studied the properties of a helically twisted photonic crystal fiber (PCF) that preserves the chirality of OAM modes of the same order, i.e., it inhibits scattering between an order + 1 mode to an order − 1 mode.
Journal ArticleDOI
Stable subpicosecond soliton fiber laser passively mode-locked by gigahertz acoustic resonance in photonic crystal fiber core
Meng Pang,Xin Jiang,Wenbin He,Gordon K. L. Wong,G. Onishchukov,Nicolas Joly,G. Ahmed,Curtis R. Menyuk,P. St. J. Russell +8 more
TL;DR: In this article, a soliton fiber laser passively mode-locked at a high harmonic (∼2 GHz) of its fundamental frequency by means of optoacoustic interactions in the small solid glass core of a short length (60 cm) of photonic crystal fiber is reported.
Journal ArticleDOI
High-resolution wavefront shaping with a photonic crystal fiber for multimode fiber imaging.
Lyubov V. Amitonova,Adrien Descloux,J. Petschulat,Michael H. Frosz,G. Ahmed,Fehim Babic,Xin Jiang,Allard Mosk,Philip St. J. Russell,Pepijn W. H. Pinkse +9 more
TL;DR: It is demonstrated that a high-numerical-aperture photonic crystal fiber allows lensless focusing at an unparalleled resolution by complex wavefront shaping, paving the way toward high-resolution imaging exceeding the capabilities of imaging with multi-core single-mode optical fibers.
Journal ArticleDOI
Strong circular dichroism for the HE11 mode in twisted single-ring hollow-core photonic crystal fiber
Paul Roth,Yue-Yue Chen,M. C. Günendi,R. Beravat,N. N. Edavalath,Michael H. Frosz,G. Ahmed,Gordon K. L. Wong,P. St. J. Russell +8 more
TL;DR: In this article, a series of experimental, analytical, and numerical studies demonstrating strong circular dichroism for the HE11-like core mode in helically twisted hollow-core single-ring photonic crystal fiber (SR-PCF), formed by spinning the preform during fiber drawing.