Article
Physics, Multidisciplinary
Hamed Pourbeyram, Pavel Sidorenko, Fan O. Wu, Nicholas Bender, Logan Wright, Demetrios N. Christodoulides, Frank Wise
Summary: This article introduces the optical nonlinearities in multimodal systems, which result in a thermalization process observed in graded-index fibres. Researchers directly observe the thermalization of mode power distribution using mode-resolved measurement techniques and verify the theoretical predictions.
Article
Optics
Shuang Wu, Zihe Gao, Tianwei Wu, Zhifeng Zhang, Liang Feng
Summary: In this study, we demonstrate the imaging of individual modes in a femto-second laser written multimode waveguide using spatial heterodyne interferometry and data post-processing decomposition. Despite the overlap between multiple waveguide modes, we are able to extract the amplitude and temporal dynamics of each individual mode. This mode imaging scheme shows promise for sensing ultrafast phase and refractive index fluctuations.
Article
Optics
Matthias C. Velsink, Lyubov Amitonova, Pepijn W. H. Pinkse
Summary: This study demonstrates how to perform nonlinear fluorescent imaging behind a multimode fiber using femtosecond optical pulses, with a connection established to the multimode fiber via a single-mode fiber. The experimental results are in good agreement with numerical simulations.
Article
Engineering, Electrical & Electronic
Ruoning Wang, Ke Tian, Meng Zhang, Zhiyuan Zhao, Gerald Farrell, Elfed Lewis, Pengfei Wang
Summary: This study presents a femtosecond laser fabricated refractive index modulated multimode fiber for high sensitivity vector bending measurement. The experimental results show that this fiber has high sensitivity, simple structure, and ultra-low temperature crosstalk in bending measurements.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Optics
Paul Hickson, Joschua Hellemeier, Rui Yang
Summary: Adaptive optics is crucial for ground-based optical and infrared astronomy, offering high angular resolution and sensitivity. Systems using laser guide stars have high sky coverage potential, but are limited by return flux availability. Amplified spontaneous emission has the potential to enhance beacon intensity, but requires a thick population inversion in an electronically dense transition, with atomic oxygen and nitrogen being potential candidates.
Article
Optics
Chenghao Liu, Mariusz Klimczak, Ryszard Buczynski, Xiahui Tang, Ming Tang, Haiyong Zhu, Luming Zhao
Summary: Experimental observation of mode-locked dissipative-soliton-resonance (DSR) pulses, including single-mode DSR pulses and multimode DSR pulses, in a Yb-doped fiber laser is reported. DSR pulses in single-mode state and multi-mode state can exist at the same time and can be output stably. The multi-mode DSR pulses exhibit same linearly broadening characteristics and bell-shaped spectral shape as single-mode DSR pulses. The results would be beneficial for expanding the knowledge of nonlinear dynamics to multimode fiber lasers and provide new insights for DSR pulse output with a fully multimode structure to get larger pulse energy.
OPTICS COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
David L. Goodwin, Pranav Singh, Mohammadali Foroozandeh
Summary: Developing fast, robust, and accurate methods for optimal control of quantum systems is crucial in current scientific research. We introduce a fast and accurate algorithm, QOALA, for optimal control of interacting qubit systems, which offers significant speedup compared to existing methods, without sacrificing accuracy.
Article
Optics
Yunlong Fan, Peng Zhang, Yang Liu, Shuang He, Yuzhu Ning, Tong Wu
Summary: This paper proposes a scheme to improve the beam profiles of multimode mode-locked fiber lasers and experimentally demonstrates the generation of noise-like pulses and beam self-cleaning phenomenon. The results enrich the nonlinear dynamics in multimode fiber lasers.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Yi-Hao Chen, Pavel Sidorenko, Robert Thorne, Frank Wise
Summary: The study focuses on the starting dynamics of Mamyshev oscillators and successfully achieves reliable starting to stable mode-locking through a combination of modulation of the pump power and shifting of a filter passband.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Optics
Y. Leventoux, G. Granger, K. Krupa, A. Tonello, G. Millot, M. Ferraro, F. Mangini, M. Zitelli, S. Wabnitz, S. Fevrier, V Couderc
Summary: The study introduces a new space-time mapping technique for directly detecting the real-time evolution of beam intensity in graded index fibers and observes instant intrapulse nonlinear coupling processes among modes.
Article
Optics
Henry Haig, Nicholas Bender, Yi-Hao Chen, Anirban Dhar, Nilotpal Choudhury, Ranjan Sen, Demetrios N. Christodoulides, Frank Wise
Summary: Kerr beam cleaning is a nonlinear phenomenon that redirects power towards the fundamental mode, resulting in bell-shaped output beams. This study focuses on beam cleaning of femtosecond pulses with gain using a multimode fiber amplifier. Experimental measurements and simulations demonstrate that the amplifier generates beams with a significant amount of fundamental mode content, regardless of the amplification levels. Control experiments without strong Kerr nonlinear effects show degraded beam profiles, contrasting with nonlinear beam cleaning. Temporal measurements reveal that the quality of amplified pulses is strongly influenced by the seed pulse parameters. These findings hold implications for the design of future high-performance fiber lasers and amplifiers.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
Article
Optics
Alexandr Dostovalov, Alexey Wolf, Zhibzema Munkueva, Mikhail Skvortsov, Sofia Abdullina, Aleksey Kuznetsov, Sergey Babin
Summary: In this study, we achieved enhanced Rayleigh backscattering up to +60 dB in a wide spectral range in both singlemode and multimode fibers by using tightly focused femtosecond laser radiation. We produced and optimized artificial Rayleigh reflectors with both continuous and discrete-point structures. In singlemode fiber, we demonstrated linewidth narrowing in a single-frequency DFB Er-doped fiber laser using a 40-cm long artificial Rayleigh reflector. In multimode GRIN fiber, we inscribed various types of localized Rayleigh reflectors and observed the dependence of backscattering signal on the positions of scattering points and the incident modes composition. Random lasing was also achieved in a 1-km MM GRIN fiber with good beam quality, using the developed multimode Rayleigh reflectors.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Ang Deng, Trivikramarao Gavara, Muhammad Rosdi Abu Hassan, Daiqi Xiong, Md Imran Hasan, Wonkeun Chang
Summary: A fiber-based approach generates mid-infrared femtosecond pulses in the 3-4 mu$\umu$m spectral region with microjoule-level single pulse energy. This is achieved in a gas-filled antiresonant hollow-core fiber that is pumped by a two-micron light source. The technique provides a new pathway to build an all-fiber-based mid-infrared supercontinuum source, which promises to be a powerful tool for ultrahigh sensitivity molecular spectroscopy.
LASER & PHOTONICS REVIEWS
(2023)
Article
Biochemical Research Methods
Y. Lange Simmons, Kenneth J. Underwood, Omkar D. Supekar, Brendan M. Heffernan, Tarah A. Welton, Emily A. Gibson, Juliet T. Gopinath
Summary: A near-infrared, femtosecond, diode laser-based source with kW peak power for two-photon microscopy was demonstrated, producing sub-ps pulses at a repetition rate of 10 MHz. Integrated with a laser-scanning microscope, the system achieved imaging to a depth of 900 mu m in a fixed sample of mouse brain tissue labeled with PLP-eGFP, marking a significant development in more efficient and compact laser sources for biomedical imaging.
BIOMEDICAL OPTICS EXPRESS
(2021)
Article
Optics
Hao Li, Baolai Yang, Meng Wang, Chenhui Gao, Baiyi Wu, Lingfa Zeng, Xiaoming Xi, Zilun Chen, Xiaolin Wang, Zefeng Wang, Jinbao Chen
Summary: In this paper, a fs-laser phase mask inscription system based on a galvanometer scanning strategy is designed to fabricate large-core fiber Bragg gratings (FBGs). The performance of the fabricated FBGs is investigated using a high-power all-fiber oscillator, achieving a maximum output power of 7920 W and an optical-optical conversion efficiency of 77.3%. This work provides a flexible, stable, and economic scanning strategy for large-core FBG inscription and exhibits excellent performance for high-power fiber lasers.
Article
Optics
Raphael Florentin, Vincent Kermene, Joel Benoist, Agnes Desfarges-Berthelemot, Dominique Pagnoux, Alain Barthelemy, Jean-Pierre Huignard
LIGHT-SCIENCE & APPLICATIONS
(2017)
Article
Optics
Raphael Florentin, Vincent Kermene, Agnes Desfarges-Berthelemot, Alain Barthelemy
Article
Optics
Kilian Le Corre, Alexandre Barnini, Thierry Robin, Benoit Cadier, Raphael Florentin, Herve Gilles, Sylvain Girard, Mathieu Laroche
Summary: We present an efficient deep-UV master-oscillator power amplifier (MOPA) laser system with a wavelength of 229 nm. It generates 350 ps pulses at a repetition rate of 2 MHz, delivering an average power of 1.2 W. By utilizing a polarization-maintaining large mode area neodymium-doped fiber, high-power laser emission of up to 28 W at sub-nanosecond regime with low spectral broadening is achieved. The infrared laser emission is directly converted to deep-UV through two nonlinear frequency conversion stages (LBO + BBO crystals). This study demonstrates the great potential of Nd3+-doped fiber lasers in producing high-power deep-UV emission.
Proceedings Paper
Engineering, Electrical & Electronic
Raphael Florentin, Vincent Kermene, Agnes Desfarges-Berthelemot, Joel Benoist, Alain Barthelemy
2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
(2017)
