Article
Materials Science, Multidisciplinary
N. Mohd Yusoff, H. K. Lee, E. K. Ng, A. F. Abas, M. T. Alresheedi, N. H. Zainol Abidin, M. A. Mahdi
Summary: This work presents a simple and cost-effective method to prepare MoO3-SA for ultrashort pulse generation. The fabricated MoO3-SA demonstrated good performance in generating mode-locked pulses in an erbium-doped fiber laser, with a short pulse duration. The use of micrometer-sized materials relaxes the strict requirements for SA fabrication compared to advanced nanomaterials.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Engineering, Electrical & Electronic
Xin Li, D. N. Wang, Kuo Hua, Qi Chen, Yunpeng Ge, Q. K. Xia
Summary: A hybrid passive mode-locked fiber laser based on a saturable absorber fabricated with graphene coating on a single-mode fiber with short waveguides is proposed. The laser operation combines nonlinear polarization rotation and saturable absorption. The hybrid mode-locked fiber laser achieves shorter pulse width and higher signal-to-noise ratio compared to using nonlinear polarization rotation mode locking alone.
OPTICAL FIBER TECHNOLOGY
(2022)
Article
Optics
Di Wu, Shuang Tian, Xiaojuan Zhang, Benli Yu, Jiajun Ma, Kang Xie, Sheng Cheng, Junxi Zhang, Zhijia Hu
Summary: A novel erbium-doped random fiber laser optical switch with rapid response and simple structure is proposed in this study. By using a liquid crystal-filled photonic crystal fiber as the sensing unit, a high-extinction ratio laser switch is achieved. The optical switch has the advantages of low cost, high sensitivity, and strong anti-interference ability.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Optics
Pei Zhang, Kaharudin Dimyati, Bilal Nizamani, Mustafa M. Najm, Moh Yasin, Sulaiman Wadi Harun
Summary: This study demonstrates the generation of ultrashort pulses in an all-fiber Erbium-doped fiber laser cavity using a doped fiber saturable absorber. The experimental results show that utilizing the saturable absorber can achieve stable mode-locked pulse trains with the potential for power enhancement.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Hai-Yue Pang, Jia-Teng Zheng, Zhao-Yun Li, Huan Liu, Zhi-Yong Tao, Ya-Xian Fan
Summary: This paper presents a dual wavelength erbium-doped random fiber laser based on a micro air cavity. The laser exhibits a low threshold of about 15 mW and a high optical signal to noise ratio of over 40 dB. By adjusting the length of the air cavity, a stable dual wavelength output with a controllable separation from 2.5 nm to 20.2 nm is achieved. The measured fluctuation in lasing wavelengths and output powers are both very small, indicating a highly stable performance. This laser is expected to fulfill the increasing demands of applications such as optical communication, lidars, and fiber sensing.
OPTICAL FIBER TECHNOLOGY
(2023)
Article
Instruments & Instrumentation
Maisarah Mansor, Nadiah Husseini Zainol Abidin, Josephine Ying Chyi Liew, Mohammed Thamer Alresheedi, Amit Kumar Garg, Vijay Janyani, Mohd Adzir Mahdi
Summary: This study demonstrates the nonlinear saturable absorption behavior of CeO2 nanoparticles and their application in stable mode-locked pulsed fiber lasers. CeO2 nanoparticles were prepared by sonicating bulk solution and combined with PDMS polymer to form a nanocomposite SA with a modulation depth of 0.66% and saturation intensity of 77 MW/cm². The efficient performance of CeO2 nanoparticles suggests their potential as a new SA material for generating ultrashort pulses.
INFRARED PHYSICS & TECHNOLOGY
(2022)
Article
Chemistry, Analytical
Siti Nur Fatin Zuikafly, Harith Ahmad, Mohd Faizal Ismail, Mohd Azizi Abdul Rahman, Wira Jazair Yahya, Nurulakmar Abu Husain, Khairil Anwar Abu Kassim, Hafizal Yahaya, Fauzan Ahmad
Summary: We study the dynamics of a high energy dual regime unidirectional Erbium-doped fiber laser in a ring cavity, which is passively Q-switched and mode-locked using an environmentally friendly graphene filament-chitin film-based saturable absorber. By adjusting the input pump power, the graphene-chitin passive saturable absorber enables the laser to operate in different modes, producing highly stable and high energy Q-switched pulses (82.08 nJ) and mode-locked pulses (1.08 ps) simultaneously. This finding is of great significance as it offers versatility and on-demand operation in various fields.
Article
Optics
Jianqun Cheng
Summary: A new eight-wavelength erbium-doped fiber laser utilizing a linear cavity structure was designed and experimentally authenticated. The laser consisted of two Sagnac loops, which used tilted fiber gratings and sampled fiber gratings to generate multi-wavelength output. Experimental results showed that the laser had narrow spectral linewidths and high optical signal-to-noise ratios.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Mustafa Mohammed Najm, Pei Zhang, Alabbas A. Al-Azzawi, Jassim K. Hmood, B. Nizamani, Sarah Mohammed Najm, Ahmed Shakir Al-Hiti, S. W. Harun
Summary: In this study, passive Q-switched and mode-locked erbium-doped fiber lasers (EDFLs) were achieved using metal salt of cadmium chloride hydrate (CdCl2.xH(2)O) as a saturable absorber (SA). The CdCl2.xH(2)O-SA was fabricated using the mechanical exfoliation method and showed a modulation depth of 20% with a saturation intensity of 80 mW/cm(2). The Q-switched laser operated at 1542 nm with a maximum repetition rate of 127 kHz and a narrowest pulse width of 1.76 μs, while the mode-locked pulses were generated within a pump power range of 91-167 mW, achieving a repetition rate of 990 kHz.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Shugeng Yao, Xuanyi Liu, Feng Ye, H. Y. Fu, Qian Li
Summary: We experimentally demonstrate harmonic mode-locking (HML) dissipative soliton resonance (DSR) pulses in an erbium-doped fiber laser by utilizing nonlinear polarization rotation (NPR) technique and adjusting the polarization controller (PC). The multi-pulsing operation in the cavity, triggered by extra filtering loss due to broadened spectra or variations of polarization states, enables the fundamental mode-locking (FML) DSR pulses to transform into harmonic mode-locking conditions. By tuning the PCs at a strong pump power, other harmonic states with the order up to 17th can be achieved.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Optics
Zbigniew Laszczych, Grzegorz Sobon
Summary: The study demonstrates that the output pulses of the oscillator have significantly different characteristics within different dispersion ranges, with one output providing higher quality pulses and the other offering ultrashort pulses. Even in the near-zero dispersion regime, the laser can directly generate ultrashort pulses with high energy.
Article
Optics
Xin Tan, Ya Liu, Yongkang Zheng, Zewu Xie, Guoqing Hu
Summary: This paper presents the research results of using saturable absorbers in a laser cavity to achieve Q-switching and mode-locking technologies, demonstrating the pulse evolution from Q-switching to Q-switched mode-locking and eventually to mode-locking. By adjusting the intra-cavity state of polarization, stable continuous wave mode-locking operation was successfully achieved.
Article
Engineering, Electrical & Electronic
Huihui Cheng, Wei Lin, Yu Zhang, Min Jiang, Wei Luo
Summary: This study focuses on the pulse instability in GHz repetition-rate thulium-doped fiber laser by using a combined physical model incorporating rate equations and nonlinear Schrodinger equation. Two pulsating regimes are predicted, and a novel pulse instability in continuous wave mode locking is revealed, providing reliable guidance for designing high repetition rate mode-locked fiber lasers.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Guanguang Gao, Zhigang Zhao, Zhenhua Cong, Qikai Zhao, Zhaojun Liu
Summary: A widely wavelength tunable mode locked Er-doped fiber laser oscillator based on NPR effect achieved continuous wavelength tunable mode locked operation and set a new record. The high SNR of the output pulses was superior to typical values reported in most papers. Additionally, by adjusting the width of the slit, the pulse duration and spectral bandwidth could be tuned accordingly.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Optics
I Armas-Rivera, L. A. Rodriguez-Morales, M. Duran-Sanchez, M. Avazpour, A. Carrascosa, E. Silvestre, E. A. Kuzin, M. Andres, B. Ibarra-Escamilla
Summary: This work introduces a simple polarization-maintaining wavelength-tunable passive mode-locked Erbium-doped fiber laser with a semiconductor saturable absorber mirror (SESAM) as a mode locker. Tunable mode-locking in the range of 1543.2 nm to 1569.5 nm was achieved by thermally adjusting the FOLM wavelength reflection, resulting in output pulses with a repetition rate of 11.16 MHz and a pulse duration of about 0.9 ps. The experimental results were verified through numerical simulations.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Optics
Yanli Zhang, Shanshan Wang, Mingzhu She, Yunjiang Rao, Weili Zhang
Summary: A spectrally programmable Raman fiber laser (RFL) is developed using two-dimensional spatial-to-spectral mapping of light in multimode fibers (MMFs). By applying wavefront shaping and genetic algorithm optimization, specific wavelengths are amplified while undesired wavelengths are blocked, allowing flexible spectral manipulation. This research expands the capabilities of RFLs and has significant implications for optical imaging, sensing, and spectroscopy applications.
PHOTONICS RESEARCH
(2023)
Article
Physics, Applied
Sangmin Ji, Takeyoshi Tajiri, Xiao-Fei Liu, Haruki Kiyama, Akira Oiwa, Julian Ritzmann, Arne Ludwig, Andreas D. Wieck, Satoshi Iwamoto
Summary: This study successfully fabricates air-bridge bull's-eye cavities with metal electrodes and demonstrates the nearly polarization-independent optical absorption of a GaAs QW embedded in the cavities. This work marks an important step toward realizing an efficient photon-spin interface using gate-defined QDs.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)
Article
Multidisciplinary Sciences
Alexey Tiranov, Vasiliki Angelopoulou, Bjorn Schrinski, Cornelis Jacobus van Diepen, Oliver August Dall Alba Sandberg, Ying Wang, Leonardo Midolo, Sven Scholz, Andreas Dirk Wieck, Arne Ludwig, Anders Sondberg Sorensen, Peter Lodahl
Summary: Photon emission is fundamental for light-matter interaction and photonic quantum science. This study demonstrates distant dipole-dipole radiative coupling in solid-state optical quantum emitters embedded in a nanophotonic waveguide. The collective response and emission dynamics can be controlled by proper excitation techniques. This work is a foundational step towards multiemitter applications for scalable quantum-information processing.
Article
Physics, Applied
Zhao Wang, Rui Ma, Jun Liu, Jing Song He, Wei Li Zhang
Summary: Scattering effect is a common issue in practical bioimaging systems, leading to a higher demand for image reconstruction from blurred images. This study proposes a non-invasive method using wavelength-dependent speckle illumination for point spread function (PSF) recovery, which enables effective image reconstruction and facilitates techniques such as image deblurring and super-resolution imaging.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Xiao-Fei Liu, Nikolai Spitzer, Haruki Kiyama, Arne Ludwig, Andreas D. Wieck, Akira Oiwa
Summary: This study investigates the magnetotransport property of GaAs/(Al,Ga)As heterostructure with short-period superlattice (SPSL) doping. After illumination at low temperature for a long time, the electron concentration inside the quantum well (QW) changes only by 5.9%. The quantum lifetime of the electron exhibits an anomalous behavior, increasing slightly and then decaying exponentially until saturation. The increase originates from the enhanced screening effect due to larger donor filling-fraction, while the decrease may be caused by scattering of ionized d+ states evolved from DX centers and transfer of excess electrons between the AlAs layers. This work provides insights into the mechanism of DX centers on the quantum transport properties of SPSL-doped heterostructures.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Applied
Thomas Descamps, Feng Liu, Sebastian Kindel, Rene Otten, Tobias Hangleiter, Chao Zhao, Mihail Ion Lepsa, Julian Ritzmann, Arne Ludwig, Andreas D. Wieck, Beata E. Kardynal, Hendrik Bluhm
Summary: Combining gate-defined quantum transport devices in GaAs-based heterostructures with optically addressed self-assembled quantum dots can greatly advance quantum technologies. By interfacing solid-state qubits with photonic quantum states, a quantum network with enhanced processing capacity in each node can be realized. A technique to create exciton traps in quantum wells by thinning the heterostructure down to a 220-nm-thick membrane has been introduced, which does not compromise the quality of the heterostructure.
PHYSICAL REVIEW APPLIED
(2023)
Article
Quantum Science & Technology
Ming Lai Chan, Alexey Tiranov, Martin Hayhurst Appel, Ying Wang, Leonardo Midolo, Sven Scholz, Andreas D. Wieck, Arne Ludwig, Anders Sondberg Sorensen, Peter Lodahl
Summary: We have demonstrated high-fidelity on-chip entanglement between an incoming photon and a stationary quantum-dot hole spin qubit using self-assembled quantum dots integrated into nanostructures. The entanglement is induced by sequential scattering of the time-bin encoded photon interleaved with active spin control within a microsecond, two orders of magnitude faster than other solid-state platforms. The entanglement fidelity is immune to the spectral wandering of the emitter when conditioned on the detection of a reflected photon. These results represent a major step towards realizing a quantum node capable of interchanging information with flying photons and on-chip quantum logic for quantum networks and repeaters.
NPJ QUANTUM INFORMATION
(2023)
Article
Multidisciplinary Sciences
Patrik I. Sund, Emma Lomonte, Stefano Paesani, Ying Wang, Jacques Carolan, Nikolai Bart, Andreas D. Wieck, Arne Ludwig, Leonardo Midolo, Wolfram H. P. Pernice, Peter Lodahl, Francesco Lenzini
Summary: Scalable photonic quantum computing requires low-loss high-speed reconfigurable circuits and near-deterministic resource state generators. In this study, we developed an integrated photonic platform based on thin-film lithium niobate and combined it with deterministic solid-state single-photon sources based on quantum dots in nanophotonic waveguides. The generated photons were processed using low-loss circuits programmable at speeds of several gigahertz, enabling various key photonic quantum information processing functionalities. This approach shows promise for scalable photonic quantum technologies by merging integrated photonics with solid-state deterministic photon sources.
Article
Quantum Science & Technology
Martin Nurizzo, Baptiste Jadot, Pierre-Andre Mortemousque, Vivien Thiney, Emmanuel Chanrion, David Niegemann, Matthieu Dartiailh, Arne Ludwig, Andreas D. Wieck, Christopher Baeuerle, Matias Urdampilleta, Tristan Meunier
Summary: We propose a protocol to achieve complete spin state readout of a two-electron system in a double quantum dot probed by an electrometer. This is done through repetitive single-shot measurements using Pauli spin blockade and our ability to tune the detuning and interdot tunnel coupling on fast timescales. By performing three distinct manipulations and measurements, we can determine if the spins are in the S, T0, T+, or T- state. This work addresses an important challenge of reducing the overhead for spin readout in scaling up spin-qubit platforms.
Article
Physics, Applied
H. Mannel, J. Kerski, P. Lochner, M. Zoellner, A. D. Wieck, A. Ludwig, A. Lorke, M. Geller
Summary: In this study, the electron spin and trion dynamics in a single self-assembled quantum dot were investigated using time-resolved resonance fluorescence. It was found that the combination of Auger recombination and electron tunneling can flip the electron spin, which limits the spin lifetime.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Jun-Yong Yan, Chen Chen, Xiao-Dong Zhang, Yu-Tong Wang, Hans-Georg Babin, Andreas D. Wieck, Arne Ludwig, Yun Meng, Xiaolong Hu, Huali Duan, Wenchao Chen, Wei Fang, Moritz Cygorek, Xing Lin, Da-Wei Wang, Chao-Yuan Jin, Feng Liu
Summary: Coherent manipulation of hole-orbital states in semiconductor quantum dots has been achieved through stimulated Auger processes, providing opportunities for developing new types of orbital-based solid-state quantum photonic devices.
NATURE NANOTECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
Alisa Javadi, Natasha Tomm, Nadia O. Antoniadis, Alistair J. Brash, Rudiger Schott, Sascha R. Valentin, Andreas D. Wieck, Arne Ludwig, Richard J. Warburton
Summary: This study investigates a scheme in which a single emitter, a semiconductor quantum dot, is embedded in a microcavity to generate single photons. By exploiting the splitting of the cavity mode, one for excitation and the other for collection, the best population inversion is achieved with a detuned laser pulse. The Rabi oscillations exhibit an unusual dependence on pulse power, attributed to the non-trivial effect of phonons on the exciton dynamics.
NEW JOURNAL OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
Xiao-Liu Chu, Camille Papon, Nikolai Bart, Andreas D. Wieck, Arne Ludwig, Leonardo Midolo, Nir Rotenberg, Peter Lodahl
Summary: Efficient light-matter interaction at the single-photon level is achieved by coupling two semiconductor quantum dot emitters to a photonic-crystal waveguide and individually controlling them using a local electric Stark field. Resonant transmission and fluorescence spectra confirm the coupling of the two emitters to the waveguide. The single-photon stream from one quantum dot is utilized for spectroscopy on the second quantum dot positioned 16 μm away, and power-dependent resonant transmission measurements indicate coherent coupling between the emitters. This work presents a scalable route to achieve multiemitter collective coupling for solid-state deterministic photon emitters.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Nadia O. Antoniadis, Mark R. Hogg, Willy F. Stehl, Alisa Javadi, Natasha Tomm, Ruediger Schott, Sascha R. Valentin, Andreas D. Wieck, Arne Ludwig, Richard J. Warburton
Summary: To improve the rapid and high-fidelity single-shot readout of quantum states, researchers used an open microcavity to enhance the optical readout signal from a semiconductor quantum dot spin state. They achieved a record readout time of only 3 nanoseconds with a fidelity of (95.2 ± 0.7)%, and observed quantum jumps using repeated single-shot measurements. This work opens up new possibilities for the use of semiconductor quantum dots in quantum technologies.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Applied
C. Papon, Y. Wang, R. Uppu, S. Scholz, A. D. Wieck, A. Ludwig, P. Lodahl, L. Midolo
Summary: We achieve on-chip single-photon generation in multiple spatial modes by resonantly exciting two quantum dots in a photonic integrated circuit. The emission wavelength of the two quantum dots is tuned to be the same using isolated p-i-n junctions, and they are excited by a resonant pump laser via dual-mode waveguides. Under continuous-wave excitation of narrow-linewidth quantum dots, we demonstrate a two-photon quantum interference visibility of (79 ± 2)%. Our work solves a significant challenge in quantum photonics by realizing how to scale up deterministic single-photon sources.
PHYSICAL REVIEW APPLIED
(2023)
