Article
Optics
Ming-Hsiung Wu, Yan-Jou Lin, Fredrik Laurell, Yen-Chieh Huang
Summary: The researchers successfully generated a visible and near-infrared super-continuum in a monolithic KTP crystal using a high-gain, ultra-broadband Raman oscillator. By maximizing Raman gain and aligning Stokes polarization perpendicular to the plane of reflections, the oscillator produced quasi-mode-locked Stokes pulses across the visible and near-infrared spectra.
Article
Optics
Ting Zhang, Xiaohong Hu, Ran Pan, Zhenguang Wang, Wei Zhang, Yashuai Guo, Ye Feng, Yishan Wang, Wei Zhao
Summary: We demonstrated a more than 30 W all-fiber supercontinuum source by pumping a four-mode graded-index multimode fiber (GIMF) with around 5 picoseconds laser pulse. The discrete spectral peaks in the range of 350-700 nm were found to be generated by the geometric parametric instability effect and quasi-phase matched harmonic generation, while the spectral broadening from 700 nm to 1750 nm (and even to 2400 nm) was caused by the radiation of dispersive waves, stimulated Raman scattering, and the effects of optical soliton. Furthermore, an experimental comparison between the four-mode GIMF and the 50/125 standard GIMF showed that the wavelengths radiated by the parametric instability differed due to different dispersion values, and the supercontinuum generated by the four-mode GIMF had a flatter spectral profile and a wider wavelength range.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Mulong Liu, Chengwei Gu, Xuening Fan, Zhiheng Li, Huimin Huang, Zhizhou Lu, Wei Zhao
Summary: The study introduces a dispersion-flattened technology for producing broadband and low anomalous dispersion while minimizing zero-dispersion wavelengths. This structure can be formed by nanophotonic waveguides using different material combinations, achieving flat dispersion ranging from 0 to 27 ps/nm/km across a wide range of wavelengths.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Optics
Xincai Diao, Runzhi Chen, Guoqing Chang
Summary: SESS technology can generate wavelength-tunable femtosecond pulses with a wide tuning range and high energy conversion efficiency. By optimizing dispersion parameters, a larger tuning range and higher conversion efficiency can be achieved.
Article
Multidisciplinary Sciences
Zahra Eslami, Lauri Salmela, Adam Filipkowski, Dariusz Pysz, Mariusz Klimczak, Ryszard Buczynski, John M. Dudley, Goery Genty
Summary: This study reports the generation of a two-octave supercontinuum from visible to mid-infrared in a non-silica graded-index multimode fiber. The fiber design utilizes a nanostructured core composed of two types of drawn lead-bismuth-gallate glass rods with different refractive indices, resulting in an effective parabolic index profile and increased nonlinearity compared to silica fibers. By studying the supercontinuum generation mechanisms and instabilities, the researchers found that appropriate injection conditions resulted in beam self-cleaning from nonlinear mode mixing. Experimental observations were supported by numerical simulations and demonstrated that the enhanced nonlinear refractive index of the lead-bismuth-gallate fiber yielded a significantly larger bandwidth compared to silica fibers.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Kangzhu Zhou, Qian Li, Zhe Kang, Jiayao Huang, P. K. A. Wai
Summary: A novel on-chip cascaded structure utilizing a microresonator and a slot waveguide for dual pump supercontinuum generation is proposed. By employing a low-power single continuous wave pump, dissipative Kerr soliton is successfully generated and serves as a dual pump seed for supercontinuum generation in the following slot waveguide. Numerical simulations have demonstrated the generation of 1.56 octave-spanning supercontinuum within the wavelength range of 1 to 3 μm.
RESULTS IN PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Vasilii Voropaev, Shangran Xie, Aleksandr Donodin, Daniil Batov, Mikhail Tarabrin, Johann Troles, Vladimir Lazarev
Summary: Researchers have successfully generated octave-spanning supercontinuum in As2S3-silica hybrid nanospike waveguides using a thulium-doped all-fiber femtosecond laser and amplifier system at a wavelength of 1.9 μm. The widest supercontinuum was obtained in the wavelength range of 1.1-2.5 μm, and it exhibited coherent characteristics throughout the entire spectral range, making it suitable for creating a self-referenced laser comb.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Shou-Fei Gao, Ying-Ying Wang, Federico Belli, Christian Brahms, Pu Wang, John C. Travers
Summary: A route to supercontinuum generation in gas-filled hollow-core anti-resonant fibers is demonstrated through the creation of a broad vibrational Raman frequency comb, followed by continuous broadening and merging of the comb lines through either rotational Raman scattering or the optical Kerr effect. The experimental results show a supercontinuum spanning from 440 to 1200 nm, with an additional deep ultraviolet continuum from 250 to 360 nm, and numerical results suggest even broader supercontinuum spectra extending from the ultraviolet to mid-infrared can be achieved.
LASER & PHOTONICS REVIEWS
(2022)
Review
Optics
Alexey G. Kuznetsov, Ilya N. Nemov, Alexey A. Wolf, Ekaterina A. Evmenova, Sergey I. Kablukov, Sergey A. Babin
Summary: The experimental results of cascaded Raman conversion using highly multimode LD pump radiation were reviewed. The study involved creating first- and higher-order Stokes radiation in multimode graded-index fibers with linear and half-open cavities. Different LD wavelengths were used for pumping, resulting in Raman lasing at various wavelengths. Various configurations were compared for output power and efficiency, spectral line shapes, beam quality, and shapes.
Article
Optics
B. Kibler, A. Lemiere, J. -T. Gomes, D. Gaponov, L. Lavoute, F. Desevedavy, F. Smektala
Summary: The experimental demonstration shows that supercontinuum generation with a bandwidth of 140 THz is achievable in a 10 cm-long all-normal dispersion step-index tellurite fiber pumped by a turn-key femtosecond fiber laser. By controlling soliton self-frequency shift and quasi-linear chirp, pulse duration can be compressed from 85 fs to 12 fs during nonlinear propagation.
OPTICS COMMUNICATIONS
(2021)
Article
Optics
Li Jiang, Rui Song, Jing Hou
Summary: A monolithic visible supercontinuum source with a record average output power of 204 W and a spectrum ranging from 580 nm to beyond 2400 nm has been achieved in a piece of standard telecom graded-index multimode fiber by designing the pumping system. The influence of the fiber length on the geometrical parameter instability effect has been analyzed for the first time, comparing the SC spectral region dominated by the GPI effect under different fiber lengths. This work could lead to robust, cost-effective, and high-power visible SC sources.
CHINESE OPTICS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Ji-Liang Wu, Xiaohui Guo, Yadong Jiao, Xucheng Zhang, Ting Wang, Yue-De Yang, Jin-Long Xiao, Daming Zhang, Guanshi Qin, Yong-Zhen Huang
Summary: In this study, an octave-spanning 10-GHz optical comb is achieved using a directly-modulated microlaser, and the optical pulse width is further reduced to 140 fs in a fiber through optimal chirp compensation.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Optics
Ting Zhang, Wei Zhang, Xiaohong Hu, Ran Pan, Zhenguang Wang, Hushan Wang, Yishan Wang
Summary: This study presents an all fiber spectrally flat supercontinuum source and reveals nonlinear phenomena in the generation of supercontinuum by investigating the evolution of output power.
LASER PHYSICS LETTERS
(2022)
Article
Mathematics, Applied
Zhixiang Deng, Yu Chen, Jun Liu, Chujun Zhao, Dianyuan Fan
Summary: This study focuses on the spectral analysis of light propagating in normally dispersive graded-index multimode fibers under initial noisy conditions. The research reveals high correlation between conjugate couples of well-separated spectral sidebands, while cross-combinations exhibit a poor degree of correlation. These results provide insights into the independent occurrence of geometric parametric instability processes associated with each sideband pair, which can be beneficial for the future implementation of high-efficiency photon pair sources with reduced Raman decorrelations.
Article
Optics
Kazuki Hashimoto, Venkata Ramaiah Badarla, Takayuki Imamura, Takuro Ideguchi
Summary: This work presents a simple method to expand the spectral bandwidth of complementary vibrational spectroscopy (CVS) using cascaded intra-pulse difference-frequency generation (IDFG). With this system, broadband CVS spectra of organic liquids spanning over 2000 cm(-1) were measured, more than double the previous study.
Article
Engineering, Electrical & Electronic
Eirini Kakkava, Babak Rahmani, Navid Borhani, Ugur Tegin, Damien Loterie, Georgia Konstantinou, Christophe Moser, Demetri Psaltis
OPTICAL FIBER TECHNOLOGY
(2019)
Article
Chemistry, Multidisciplinary
Eirini Kakkava, Navid Borhani, Babak Rahmani, Ugur Tegin, Christophe Moser, Demetri Psaltis
APPLIED SCIENCES-BASEL
(2020)
Article
Optics
U. Tegin, B. Rahmani, E. Kakkava, N. Borhani, C. Moser, D. Psaltis
Article
Optics
Ugur Tegin, Babak Rahmani, Eirini Kakkava, Demetri Psaltis, Christophe Moser
Review
Nanoscience & Nanotechnology
Babak Rahmani, Ilker Oguz, Ugur Tegin, Jih-liang Hsieh, Demetri Psaltis, Christophe Moser
Summary: This paper introduces the potential of multimode fibers (MMF) for image transmission and explores the use of machine learning methods for image imaging and transmission. The advantages and disadvantages of using methods such as analog phase conjugation, digital phase conjugation, or full-wave holographic transmission matrix for fiber imaging are discussed.
Proceedings Paper
Engineering, Electrical & Electronic
Ugur Tegin, Mustafa Yildirim, Ilker Oguz, Christophe Moser, Demetri Psaltis
Summary: This study presents a novel optical computing framework for machine learning by harnessing the spatiotemporal nonlinear effects of multimode fibers. Through linear and nonlinear interactions of the spatial fiber modes, a brain-inspired computation engine is experimentally realized.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Babak Rahmani, Damien Loterie, Eirini Kakkava, Navid Borhani, Ugur Tegin, Demetri Psaltis, Christophe Moser
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Ugur Tegin, Mustafa Yildirim, Ilker Oguz, Christophe Moser, Demetri Psaltis
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Ugur Tegin, Babak Rahmani, Eirini Kakkava, Demetri Psaltis, Christophe Moser
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Babak Rahmani, Ugur Tegin, Mustafa Yildirim, Ilker Oguz, Damien Loterie, Eirini Kakkava, Navid Borhani, Demetri Psaltis, Christophe Moser
Summary: This study introduces a computational method for controlling the output of a multimode fiber using machine learning, achieving high fidelities with amplitude-only calibration. Additionally, it demonstrates that multimode fibers can be used as a computational tool for end-to-end learning tasks with high speed and low power consumption.
2021 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXPOSITION (OFC)
(2021)
Article
Computer Science, Interdisciplinary Applications
Ugur Tegin, Mustafa Yildirim, Ilker Oguz, Christophe Moser, Demetri Psaltis
Summary: The study presents an optical computing framework based on spatiotemporal effects in multimode fibers for high-speed computations, addressing the energy scaling problem without compromising speed. The method leverages the simultaneous, linear and nonlinear interaction of spatial modes as a computation engine, showing comparable accuracy with digital implementations for various tasks.
NATURE COMPUTATIONAL SCIENCE
(2021)
Article
Computer Science, Artificial Intelligence
Ugur Tegin, Niyazi Ulas Dinc, Christophe Moser, Demetri Psaltis
NATURE MACHINE INTELLIGENCE
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Ugur Tegin, Eirini Kakkava, Babak Rahmani, Demetri Psaltis, Christophe Moser
2020 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2020)
Article
Computer Science, Artificial Intelligence
Babak Rahmani, Damien Loterie, Eirini Kakkava, Navid Borhani, Ugur Tegin, Demetri Psaltis, Christophe Moser
NATURE MACHINE INTELLIGENCE
(2020)
Article
Optics
Ugur Tegin, Babak Rahmani, Eirini Kakkava, Demetri Psaltis, Christophe Moser
ADVANCED PHOTONICS
(2020)
