11 citations · 24 across the 10 of their papers we have counts for
10 papers
Stability of Orbital Angular Momentum Modes in Conventional and Ring-Core Optical Fibers
Hassan Asgharzadeh B., Regina Gumenyuk, Marco Ornigotti
Modal dynamics in multimode optical fibers are fundamentally governed by the inter- play between phase matching and intermodal coupling. In this work, we investigate the fundamenta…
Noise-like pulse laser source with ultrabroadband tunability and coherence-limited sub-structure
Xinyang Liu, Matias Koivurova, Regina Gumenyuk
High brightness and low coherence laser sources with wideband tunability are essential for many full-field imaging applications aiming for high contrast and speckle free performanc…
Power-Scalable Generation of High-Order Optical Vortices Via Coherent Beam Combining
Hossein Fathi, Rafael F. Barros, Regina Gumenyuk
Structured light beams, such as optical vortices carrying orbital angular momentum, are essential for applications ranging from low-power optical communications to high-intensity l…
High-purity amplification of circularly polarized orbital angular momentum modes in an active spun ring-core tapered fiber
Iuliia Zalesskaia, Hassan Asgharzadeh B., Zahra Eslami +9
Structured light, optical fields engineered in their spatial, polarization, or phase degrees of freedom, has become a key resource across advanced communication, sensing, imaging,…
Optical Vortex Dynamics in non-uniform twisted Ring-Core Fibers
Hassan Asgharzadeh B., Regina Gumenyuk, Marco Ornigotti
In this work, we present a thorough analysis of the propagation of fiber modes carrying orbital angular momentum in twisted, tapered, ring-core optical fibers. In particular, by ge…
High-power monolithic narrow-linewidth 1.6 mJ/8 ns fiber laser system based on all-glass spun tapered double-clad fiber amplifier
Hossein Fathi, Uttam Samanta, Evgenii Motorin +5
High-energy, narrow-linewidth nanosecond pulses are highly demanding for many applications that require high temporal and spatial coherence. However, the amplification of narrow-li…
Versatile High-Power Monolithic All-Glass Fiber Amplifier for Pulsed Signals with a Wide Range of Repetition Rates
Hossein Fathi, Ebrahim Aghayari, Andrey Grishchenko +4
This study presents a compact, high-power monolithic all-glass spun tapered double-clad fiber amplifier for single-stage amplification of narrow linewidth picosecond pulsed signals…
Coherent beam combining of optical vortices
Hossein Fathi, Mikko Narhi, Regina Gumenyuk
We experimentally demonstrate the power scaling of optical vortices by the coherent beam combining, encompassing topological charges ranging from l=1 to l=5 realized on the basis o…
1720nm-1800nm tunable chirped pulse amplification based on thulium-doped fiber
Xinyang Liu, Regina Gumenyuk
Chirped pulse amplification (CPA) has been adopted as a commonly used methodology to obtain powerful ultrashort laser pulses since its first demonstration. However, wavelength-tuna…
Predicting mode-locked fiber laser output using feed-forward neural network
Xinyang Liu, Regina Gumenyuk
With a great ability to solve regression problems, the artificial neural network has become a powerful tool to facilitate advancing ultrafast laser research. In this contribution,…