Article
Optics
Pradeep K. Gupta, C. P. Singh, P. K. Mukhopadhyay, S. K. Dixit, K. S. Bindra
Summary: In this study, dark-bright pulse pair generation is achieved from a ytterbium doped fiber laser mode-locked by cascaded nonlinear multimode interference (MMI) effect. The MMI is implemented in a step index single mode-multimode-single mode fiber structure. By adjusting the polarization controller, stable dark-bright pulses are observed at different repetition rates. The optical spectrum of the dark-bright pulses exhibits double peaks and the width of the pulses varies with pump power.
Article
Physics, Multidisciplinary
Qin Wei, Xile Han, Huanian Zhang, Chonghui Li, Chao Zhang, Baoyuan Man
Summary: This study proposes a new strategy to improve the output energy of erbium-doped fiber lasers using indium selenide (In2Se3) prepared by physical vapor deposition method. By adjusting the polarization state, stable mode-locked bright pulses and triple-wavelength dark-bright pulse pair generation were successfully achieved, with significantly improved average output power and pulse energy compared to previous work.
FRONTIERS IN PHYSICS
(2021)
Article
Optics
M. D. Rotondaro, B. Zhdanov, M. K. Shaffer, Z. J. Eyler, R. J. Knize
Summary: This paper presents the first demonstration of passive mode-locking in a diode-pumped alkali laser (DPAL). An intracavity cesium vapor cell, buffered by atmospheric pressure methane, is used to passively mode lock a continuously pumped cesium DPAL with a static gain medium. A train of short pulses with duration less than 460 ps was observed using a 2.0-GHz bandwidth detector that limited the real time duration measurements. The calculated minimum duration for these pulses is 57 ps.
Article
Instruments & Instrumentation
Zhipeng Ding, Hao Sun, Jianghao Xu, Weiyu Fan, Yunao Han, Cheng Lu, Caixun Bai, Wenfei Zhang, Huanian Zhang, Wei Qu, Guomei Wang
Summary: Stable Q-switched pulses and bright-dark soliton pairs were achieved in an InSb based erbium-doped fiber laser. For Q-switched pulses, a stable passive operation was achieved with a central wavelength of 1565.38 nm and a repetition frequency up to 10.623 kHz when the pump power was between 70 and 115 mW. For bright-dark soliton pairs, stable mode-locking operation was realized with two peaks of the spectrum located at 1568.67 and 1569.34 nm, and a repetition rate of 3.419 MHz when the pump power was increased to the range of 185 to 450 mW.
INFRARED PHYSICS & TECHNOLOGY
(2023)
Article
Optics
Zhaokun Wang, Wendi Wu, Tianyu Zhu, Kuo Hua, Shuo Chang, D. N. Wang, Feng Gao
Summary: We implemented a multimode fiber (MMF) laser system mode-locked by nonlinear polarization rotation technique for controllable synchronous multi-wavelength soliton generation. Synchronization of different wavelengths is achieved by special mode transmission in MMF, producing optimized power output with balanced two-color intensities. The output includes dual- and tri-wavelength synchronized femtosecond pulses, providing a simpler solution for achieving pulse synchronization directly from a laser oscillator.
Article
Optics
H. Ahmad, A. Ismail, M. Z. Samion, M. F. Ismail
Summary: This work demonstrates the successful generation of highly stable mode-locked pulses in a thulium-doped fiber laser using manganese phosphorus triselenide as the saturable absorber. The mode-locked laser has a center wavelength of 1937.0 nm and a bandwidth of 2.69 nm, with a pulse duration of 1.56 ps. The center wavelength of the laser can be tuned from 1937 to 1939 nm by stretching the fiber.
JOURNAL OF LUMINESCENCE
(2022)
Article
Physics, Applied
Xingxing Zhan, Ying Zhang, Xiaohong Yan, Yang Xiao
Summary: Bright and dark magnon modes of an exchange-coupled ferromagnetic bilayer were studied, revealing that the occurrence of a dark mode requires equal frequencies for the two magnon modes, while the dark magnon mode is determined by both magnon frequencies and the strengths of magnon-photon and direct magnon-magnon coupling when direct magnon-magnon coupling is present. These results may be beneficial for future cavity magnonic experiments involving ferromagnetic bilayers.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Optics
Dongming Zhang, Yichang Meng, Chen Zhang, Jingbo Zhou
Summary: The experiment observed the coexistence of multiple solitons, noise-like pulses, and a special pattern of multiple solitons with noise-like pulses in a passively mode-locked erbium-doped fiber laser. By adjusting the pump power and cavity polarization state, the transition from pure multiple solitons to noise-like pulses can be achieved, with the transition from pure multiple solitons to multiple solitons and noise-like pulses being abrupt and the transition from multiple solitons and noise-like pulses to pure noise-like pulses being gradual.
OPTICS COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Masataka Nakazawa, Masato Yoshida, Toshihiko Hirooka
Summary: In this experiment, various dark and bright pulses were generated from an FM mode-locked laser. The generated pulses matched well with the theoretical profiles, even below -40 dB. The generation of dark pulses with different shapes, such as parabolic and triangular, was also demonstrated. Furthermore, the generation of tanh(t/T) pulses, known as a dark soliton solution, was achieved by cascading positive and negative tanh(t/T) pulses.
IEEE JOURNAL OF QUANTUM ELECTRONICS
(2022)
Article
Optics
Xuexiao Ma, Chuansheng Dai, Jialiang Lv, Jiaqiang Lin, Peijun Yao, Lixin Xu
Summary: In this work, a novel fiber laser that emits a mode-locked pulse flat-top beam is proposed. The laser utilizes the incoherent superposition of cylindrical vector modes and fundamental modes to achieve excellent beam quality. The experimental results show favorable effects, and this laser is the first of its kind based on an all polarization-maintaining fiber structure.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Optics
Yoon-Soo Jang, Jungjae Park, Jonghan Jin
Summary: This study proposes a linear-type wavelength-tunable all-polarization-maintaining fiber mode-locked laser with a wide tuning range and high repetition rate. The laser, implemented with simplified and compact linear configuration and reliable polarization-maintaining fiber components, shows potential for various applications.
Article
Optics
Jinhwa Gene, Dong-Il Yeom, Seung Kwan Kim, Sun Do Lim
Summary: The study introduces a high-energy, low-frequency 2-micron femtosecond fiber laser designed for laser surgery and vehicle laser detection and ranging applications. The laser, incorporating thulium-doped fiber gains and hybrid mode-locking techniques, achieved the highest pulse energy and lowest pulse rate reported to date, with pulse duration and output optical spectrum characteristics also evaluated for stability over extended periods.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Optics
N. Z. A. Naharuddin, M. H. Abu Bakar, A. R. Sadrolhosseini, N. Tamchek, M. T. Alresheedi, A. F. Abas, M. A. Mahdi
Summary: The optical performance of passively mode-locked pulses in an erbium-doped fiber laser incorporating gold-nanoparticles as a saturable absorber has been demonstrated. The spherical Au-NPs synthesized by pulsed laser ablation are proven to be a feasible SA material with stable mode-locking operation in the 1.55 μm wavelength region.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Optics
Anton Pakhomov, Mikhail Arkhipov, Nikolay Rosanov, Rostislav Arkhipov
Summary: The article derives a generalization of the area theorem for a pulse circulating inside a ring laser cavity. Unlike the standard area theorem, which applies to a single pass of a traveling pulse through a resonant medium, the derived generalized area theorem considers the medium-assisted nonlinear self-action effects caused by the medium excitation left by the pulse in the previous round-trip in the cavity. The derived area theorem can be used for the analytical description of various coherent photonic devices and the analysis of photon echo formation in cavity-based setups.
Article
Optics
Qianchao Wu, Zheng Wu, Yong Yao, Xiaochuan Xu, Lifang Chen, Yufeng Zhao, Ke Xu
Summary: A new BDB vector pulse fiber laser is reported, utilizing the properties of MoS2 saturable absorber, where a dark pulse component and one bright pulse component form a dark-bright pulse pair with the same polarization state, and another bright pulse is orthogonally polarized. The time interval between the bright pulse and the dark-bright pulse pair remained constant as pump power increased.
OPTICS COMMUNICATIONS
(2021)
Article
Optics
Yang Liu, Ziqian Zhang, Maurizio Burla, Benjamin J. Eggleton
Summary: The development of electronic radars with increased bandwidth and fast processing capability is driven by the growing demand for high resolution and real-time recognition in radar applications. However, the hardware burden on complex and high-speed electronics limits their capability for applications that demand high spatial resolutions. A photonics-based radar is demonstrated for the first time, which eliminates the requirement for ultra-fast electronics for wideband radar signal generation and processing. This radar achieves centimeter-level spatial resolution and real-time imaging, providing an important technological basis for next-generation broadband radars.
LASER & PHOTONICS REVIEWS
(2022)
Article
Optics
Behrad Gholipour, Stephen R. Elliott, Maximilian J. Mueller, Matthias Wuttig, Daniel W. Hewak, Brian E. Hayden, Li Yifei, Seong Soon Jo, Rafael Jaramillo, Robert E. Simpson, Junji Tominaga, Cui Yihao, Avik Mandal, Benjamin J. Eggleton, Martin Rochette, Mohsen Rezaei, Imtiaz Alamgir, Hosne Mobarok Shamim, Robi Kormokar, Arslan Anjum, Gebrehiwot Tesfay Zeweldi, Tushar Sanjay Karnik, Juejun Hu, Safa O. Kasap, George Belev, Alla Reznik
Summary: Alloys of sulfur, selenium and tellurium, known as chalcogenide semiconductors, provide a versatile and controllable material platform for a range of photonic applications. They have nonlinear optical and photoconductive properties, wide transmission windows, and various dielectric and plasmonic properties across different frequencies. The roadmap collection emphasizes the critical role of chalcogenide semiconductors in traditional and emerging photonic technologies, and showcases the potential of this field through selected socio-economically important research areas.
JOURNAL OF PHYSICS-PHOTONICS
(2023)
Article
Optics
Choon Kong Lai, Moritz Merklein, Alvaro Casas-Bedoya, Yang Liu, Stephen J. Madden, Christopher G. Poulton, Michael J. Steel, Benjamin J. Eggleton
Summary: This paper investigates the performance of a Brillouin-based isolation scheme in a traditional ridge waveguide. The study finds that acoustic confinement and Brillouin-driven mode conversion can be enhanced by selecting appropriate optical mode pairs and waveguide geometries. By optimizing the entire isolator design, including input couplers, mode filters, Brillouin-active waveguides, and device fabrication tolerances, it is predicted that the device can achieve 30 dB isolation over a 38 nm bandwidth with 500 mW pump power. In the presence of a +/- 10 nm fabrication-induced width error, such isolation can be maintained over a 5-10 nm bandwidth.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
Article
Optics
Vincent Ng, Farhan Azeem, Luke S. Trainor, Harald G. L. Schwefel, Stephane Coen, Miro Erkintalo, Stuart G. Murdoch
Summary: Parametric oscillation in Kerr microresonators offers a promising method to generate new optical frequencies in a compact and low-power device. However, the generation of large frequency shift sidebands usually requires precise phasematching, which is limited by the resonator's dispersion profile. In this paper, we propose a multimode four-wave-mixing process that relaxes the phasematching requirements, allowing the formation of large frequency shift sidebands even in resonators with strong second-order dispersion. Experimental results using a magnesium-fluoride micro-disk resonator demonstrate the generation of four distinct multimode parametric processes with frequency shifts ranging from 118 to 216 THz, achieving a separation of almost three octaves between the two sidebands.
Article
Optics
Luke Mckay, Choon Kong Lai, Nicholas J. Athanasios, Duk-Yong Choi, Stephen J. Madden, Benjamin J. Eggleton, Mortiz Merklein
Summary: Microwave photonics provides a promising solution for frequency converting microwave signals. In this study, a chip-based stimulated Brillouin scattering and interferometry technique is used to demonstrate the first microwave photonic mixer with image rejection of broadband signals. The mixer achieves frequency down-conversion of carrier frequencies ranging from 10 GHz-16 GHz, ultra-high image rejection for single tone signals up to 70 dB, and image rejection of 28.5 dB and 16 dB for 100 MHz and 400 MHz wide analogue signals, respectively. Furthermore, the mixer successfully down-converts 200 Mb/s quadrature-phase-shift keying signals with a low error vector magnitude of -9.6 dB, even when there are interfering image signals present.
Article
Nanoscience & Nanotechnology
Ju Won Choi, Byoung-Uk Sohn, Ezgi Sahin, George F. R. Chen, Peng Xing, Doris K. T. Ng, Benjamin J. J. Eggleton, Dawn T. H. Tan
Summary: This manuscript investigates nonlinear pulse propagation in a chip-based nonlinear Bragg grating and observes clear signatures of gap soliton propagation, including slow light, intensity-dependent transmission, intensity-dependent temporal delay, and gap soliton compression.
Review
Peripheral Vascular Disease
Patrizia Natale, Jia Yi Ni, David Martinez-Martin, Ayano Kelly, Clara K. Chow, Aravinda Thiagalingam, Corinne Caillaud, Benjamin Eggleton, Nicole Scholes-Robertson, Jonathan C. Craig, Giovanni F. M. Strippoli, Allison Jaure
Summary: This study explored the perspectives and experiences of self-monitoring of blood pressure in patients with hypertension. The findings revealed that self-monitoring of blood pressure can empower patients, provide reassurance and convenience, and complement medical diagnosis and treatment. However, there are challenges such as inadequate knowledge and understanding of blood pressure targets and interpretation, limited access to monitoring devices, and psychological burdens associated with self-monitoring.
AMERICAN JOURNAL OF HYPERTENSION
(2023)
Article
Optics
Maxime Zerbib, Maxime Romanet, Thibaut Sylvestre, Christian Wolff, Birgit Stiller, Jean-charles Beugnot, Kien phan Huy
Summary: In this study, the spin-orbit interaction between circularly polarized light and a transverse vortex acoustic wave was investigated using Brillouin backscattering. Two operating regimes were observed, with the backscattered signal being either depolarized or circularly polarized, depending on the input pump polarization. It was demonstrated that when the pump was circularly polarized, the backscattered signal underwent a handedness reversal of circular polarization due to opto-acoustic spin-orbit interaction and the conservation of overall angular momentum.
Article
Optics
Liam Quinn, Gang Xu, Yiqing Xu, Zongda Li, Julien Fatome, Stuart G. Murdoch, Stephane Coen, Miro Erkintalo
Summary: We demonstrate an all-optical random number generator based on spontaneous symmetry breaking in a coherently driven Kerr resonator. Random bit sequences are generated by repeatedly tuning a control parameter across a symmetry-breaking bifurcation that enacts random selection between two possible steady-states of the system. The generated bits have a rate of 3 MHz without post-processing and their randomness is verified using statistical test suites.
Article
Optics
Ziqian Zhang, Yang Liu, Tegan Stephens, Benjamin J. J. Eggleton
Summary: Researchers have developed a photonic radar for non-contact vital sign detection, overcoming limitations of traditional monitoring methods. The radar achieves millimetre-level range resolution with a bandwidth of up to 30 GHz. The study also explores the use of optical signals generated by the system for LiDAR-based vital sign detection, offering potential for improved accuracy and system resilience.
Article
Optics
Matthew Macnaughtan, Miro Erkintalo, Stephane Coen, Stuart Murdoch, Yiqing Xu
Summary: In this study, Kerr cavities driven in the normal dispersion regime were investigated, and switching waves were found. The fine structure of individual switching waves, including resonant oscillations, was directly observed with nanosecond pulses. The intimate connection between the temporal and spectral features of the dispersive waves associated with switching waves was demonstrated, and the evolution of these dispersive waves with cavity parameters was investigated. Additionally, the generation and observation of stable and persistent dark pulses under quasi-CW pumping conditions were achieved, validating the accuracy of the dispersive wave formalism used.
Article
Materials Science, Multidisciplinary
Choon Kong Lai, Moritz Merklein, Duk-Yong Choi, Kunlun Yan, Alvaro Casas Bedoya, Stephen J. Madden, Benjami J. Eggleton
Summary: This paper presents the first experimental observation of reversible 1550 nm-induced Bragg gratings and stimulated Brillouin scattering (SBS) in a planar waveguide made of high-index chalcogenide material, arsenic triselenide (As2Se3). The temporary grating is inscribed by the two-photon absorption (TPA)-induced refractive index change along the waveguide, facilitated by the high Fresnel reflection from the chip facet. The SBS measurements reveal the Brillouin gain coefficient and frequency shift values, and the investigation explains the observed broadening of the linewidth due to the photorefractive effect in the waveguide.
OPTICAL MATERIALS EXPRESS
(2023)
Article
Optics
Caleb Todd, Zongda Li, Stuart G. Murdoch, Gian-Luca Oppo, Miro Erkintalo
Summary: Temporal Kerr cavity solitons are light pulses that can exist in coherently driven, dispersive resonators with Kerr-type nonlinearity. Previous studies have assumed that the inhomogeneity of the driving field varies slowly across the soliton, leading to linear soliton drift rate. However, in some cases, such as using bichromatic driving or in the presence of third-order dispersion, the assumption of slowly varying inhomogeneity may not hold true.
Article
Optics
Pierce C. Qureshi, Farhan Azeem, Luke S. Trainor, Harald G. Schwefel, Stephane Coen, Miro Erkintalo, Stuart G. Murdoch
Summary: Optical microresonators are used to generate optical frequency combs, and the parameters of the radio-frequency comb spectrum can be finely-tuned by interfering two optical pumps with different azimuthal mode numbers. Experimental results show that a discrete tunability of about 1MHz in the line-spacing of the radio-frequency comb can be achieved.
Article
Engineering, Electrical & Electronic
Matthew Garrett, Moritz Merklein, Benjamin J. Eggleton
Summary: In this review paper, perspectives on the implementation of high-performance, wideband, chip-based Brillouin microwave photonic processing subsystems for phased array antennas are provided, including recent advances and a roadmap for further development.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
