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
Physics, Multidisciplinary
Xinyu Yang, Jian Yang, Qibo Xu, Hua Yang
Summary: We have numerically demonstrated the generation of super-flat coherent mid-infrared supercontinuum in all-normal dispersion As39Se61 chalcogenide photonic crystal fiber (PCF). The obtained PCF with flat-ANDi and high nonlinearities by optimizing the structural parameters of the fiber. The super-flat coherent mid-infrared supercontinuum extended from 2.17 to 7.47 μm under 3 dB spectral flatness when pumping laser pulses with a 50 fs pulse width and 6 kW peak power at 3.35 μm. Such coherent mid-infrared supercontinuum is highly demanded in optical coherence tomography, biological imaging, and frequency metrology.
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
Physics, Multidisciplinary
Kun Xiao, Yudong Ye, Rui Min
Summary: In this study, broadband and coherent supercontinuum spectra were generated in the mid-infrared region using dispersion-engineered all-chalcogenide microstructured fibers (MOFs). The fibers exhibited a broad and flat all-normal-dispersion characteristic, making them suitable for various applications.
FRONTIERS IN PHYSICS
(2022)
Article
Computer Science, Information Systems
Jian Yang, Yingning Wang, Yuxi Fang, Wenpu Geng, Wenqian Zhao, Changjing Bao, Yongxiong Ren, Zhi Wang, Yan-Ge Liu, Zhongqi Pan, Yang Yue
Summary: In this study, a silica-cladded Germania-doped ring-core fiber was designed and analyzed numerically. The optimized fiber structure achieved all-normal and flat dispersion, enabling the generation of a highly coherent 1.3-octave supercontinuum spectrum for orbital angular momentum modes.
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
Irina Zhluktova, Andrei D. Zverev, Serafima A. Filatova, Vladimir A. Kamynin, Alexej A. Sysoliatin, Vladimir B. Tsvetkov
Summary: Octave-spanning supercontinuum conversion has been investigated in three different rare-earth doped fiber amplifiers. The erbium amplifier achieved an output power of 445 mW with a spectral width of 1250 nm. The thulium amplifier obtained an average output power of 390 mW and a spectral width of 569 nm. Additionally, the holmium amplifier produced an average output power of 724 mW with a spectral width of 450 nm. In all cases, the output pulse envelope did not exceed 0.72 ns.
Article
Optics
Surajit Bose, Oliver Melchert, Stephanie Willms, Ihar Babushkin, Uwe Morgner, Ayhan Demircan, Govind P. Agrawal
Summary: The frequency dependence of the nonlinear parameter plays a crucial role in the evolution of femtosecond solitons inside photonic crystal fibers. The conventional approach based on the self-steepening effect is not appropriate for fibers with two zero-dispersion wavelengths, and higher-order nonlinear terms are necessary for realistic modeling of nonlinear phenomena in PCFs. These terms not only affect the Raman-induced wavelength shift of a soliton but also impact its shedding of dispersive radiation.
Article
Optics
Yiquan Wen, Hongzhi Jia
Summary: We designed an all-normal flat near-zero dispersion As2S3 photonic crystal fiber (PCF) with orderly arranged air hole rings to generate an orbital angular momentum (OAM) supercontinuum (SC). By carefully engineering the PCF, we optimized the chromatic dispersion and confinement loss characteristics compared to previous studies. Simulation results show that launching a specific pulse into the designed PCF can form a highly coherent OAM(1,1) SC with a wide bandwidth.
OPTICAL ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Shah Md. Salimullah, Mohammad Faisal
Summary: In this work, a Zinc-Germanium Diphosphide (ZnGeP2) based single material photonic crystal fiber is proposed for near and mid-infrared supercontinuum generation. The use of a single material eliminates the difficulties associated with choosing separate materials for the core and cladding. The fiber exhibits low and flattened dispersion, high nonlinearity, and low confinement loss, enabling the generation of an unprecedented bandwidth of 31000 nm.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Ma Ziyang, Li Li, Ni Xiaowu
Summary: This paper theoretically investigates the supercontinuum generation using a novel photonic-crystal pillar waveguide (PCPW) spanning from near-infrared (NIR) to mid-infrared. By optimizing the PCPW design and dispersion properties, the study achieves ultra-broadband spectral broadening from 1 to 10 micrometers under relatively lower peak power pump pulses. The proposed PCPW offers an efficient waveguide structure for generating ultra-broadband supercontinuum with shorter wavelength laser sources.
OPTICAL AND QUANTUM ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
Ying Huang, Hua Yang, Saili Zhao, Yucheng Mao, Shuyuan Chen
Summary: A photonic crystal fiber (PCF) with tailored dispersion characteristics was designed for supercontinuum (SC) generation, showing coherence in both normal and anomalous dispersion regions. The use of flat dispersion curves and time-domain compression resulted in wide, flat, and coherent SC with a wavelength range of 1281-2200 nm. This study provides insights for PCF design and opens up new possibilities for generating wide flat coherent spectra.
RESULTS IN PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Lanh Chu Van, Thuy Nguyen Thi, Bao Tran Le Tran, Duc Hoang Trong, Ngoc Vo Thi Minh, Hieu Van Le, Van Thuy Hoang
Summary: Numerical calculations of multi-octave spanning supercontinuum generation were carried out in two proposed As2Se3 photonic crystal fibers, taking into account the effects of vacuum noise and pulse-to-pulse relative intensity noise. The results showed high coherence in the SCG due to vacuum noise, but significant coherence reduction was observed due to pulse-to-pulse relative intensity noise, which depends on pulse duration and physical mechanisms of spectral broadening.
PHOTONICS AND NANOSTRUCTURES-FUNDAMENTALS AND APPLICATIONS
(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
Optics
Ashutosh Rao, Gregory Moille, Xiyuan Lu, Daron A. Westly, Davide Sacchetto, Michael Geiselmann, Michael Zervas, Scott B. Papp, John Bowers, Kartik Srinivasan
Summary: The study introduces an integrated photonics interposer architecture that effectively handles microcomb signals and achieves octave-spanning spectral filtering of optical frequency combs. This technology addresses the challenge of on-chip microcomb processing and has the potential to further apply miniaturized optical systems to other metrology-grade applications successfully.
LIGHT-SCIENCE & APPLICATIONS
(2021)
Article
Optics
Sheida Mahmoodi, Christoph Bacher, Alexander Heidt, Christoph Latt, Daryoush Abdollahpour, Valerio Romano, Thomas Feurer, Manuel Ryser
Summary: By using a versatile scheme of nonlinear polarization rotation (NPR) mode-locking, the automatic characterization of a mode-locked thulium-doped fiber laser in soliton regime has been performed, allowing for the determination of optimal mode-locking parameters through analysis of large data sets. This approach paves the way for smart fiber lasers.
OPTICS COMMUNICATIONS
(2021)
Article
Optics
Farooq Kyeyune, Erich G. Rohwer, Hubertus M. von Bergmann
Summary: The evaluation of a surface-wire corona preionized miniature CO2 laser showed that it can greatly improve output energy and discharge stability. These results serve as a reference for developing larger-scale laser systems in the future.
Article
Optics
Saher Junaid, Joerg Bierlich, Alexander Hartung, Tobias Meyer, Mario Chemnitz, Markus A. Schmidt
Summary: Supercontinuum generation in a liquid-core microstructured optical fiber using carbon disulfide as the core material shows promising applications in the telecommunication domain. The experiments with different pump lasers of varying pulse durations demonstrate the unique non-instantaneous contributions of carbon disulfide, resulting in high conversion efficiency from pump to soliton and dispersive wave. This platform allows for studying the impact of non-instantaneous responses on ultrafast soliton dynamics and coherence using straightforward pump lasers and diagnostics.
Article
Materials Science, Multidisciplinary
Behayilu S. Desalegn, Nika Bekri, Fekadu G. Hone, Dinsefa M. Andoshe, Wendimagegn Mammo, Zelalem Abdissa, Gurthwin Bosman, Newayemedhin A. Tegegne
Summary: Three low band gap copolymers with different alkyl side chains were synthesized and their thermal stability was found to be highly dependent on the lengths of the side chains. The optimization of side chains in P2 led to higher thermal stability compared to P3 and P1. The results highlight the importance of alkyl side chain optimization for the stability of copolymers.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Optics
Hieu Van Le, Van Thuy Hoang, Grzegorz Stepniewski, Trung Le Canh, Ngoc Vo Thi Minh, Rafal Kasztelanic, Mariusz Klimczak, Jacek Pniewski, Khoa Xuan Dinh, Alexander M. Heidt, Ryszard Buczynski
Summary: The study investigates the generation of all-normal dispersion supercontinuum in a lead-bismuthgallate glass solid-core photonic crystal fiber with cladding air-holes infiltrated with carbon tetrachloride. By using liquid infiltration, the design of soft-glass fibers with an exceptionally flat dispersion profile is enabled, allowing for the generation of a coherent supercontinuum with high nonlinearity and low normal dispersion. The results show the potential of liquid-composite fibers for scaling the pulse repetition rate of supercontinuum sources, making them suitable for applications requiring high-speed nonlinear imaging, optical communications, or frequency metrology. Furthermore, the supercontinuum generated could serve as a coherent seed for low-noise ultrafast lasers operating in the short-wave infrared spectral region.
Article
Chemistry, Analytical
Isabel dos Santos, Gurthwin Bosman, Jose Luis Aleixandre-Tudo, Wessel du Toit
Summary: Fluorescence spectroscopy combined with chemometrics was successfully used to directly quantify phenolic content in red wine and fermenting samples. Predictive models for total phenols, total condensed tannins and total anthocyanins were built using machine learning algorithms, showing good classification ability for South African red wine cultivars. This approach could be a useful tool for authentication and quality control by regulatory bodies.
Article
Optics
Benoit Sierro, Pascal Haenzi, Dirk Spangenberg, Anupamaa Rampur, Alexander M. Heidt
Summary: The study presents a novel approach to achieve a low-noise, phase-coherent supercontinuum light source by combining the advantages of nonlinear dynamics in both anomalous and all-normal dispersion regimes. The hybrid fiber design demonstrated ultra-low noise and high phase coherence, significantly expanding the spectral bandwidth and reducing the relative intensity noise compared to direct pumping of individual fibers.
Article
Multidisciplinary Sciences
Ronit Sohanpal, Haonan Ren, Li Shen, Callum Deakin, Alexander M. Heidt, Thomas W. Hawkins, John Ballato, Ursula J. Gibson, Anna C. Peacock, Zhixin Liu
Summary: This study demonstrates frequency comb generation using a fully-fibre integrated silicon core fibre as a nonlinear mixer. The all-fibre, cavity-free source combines the material benefits of planar waveguide structures with the advantageous properties of fibre platforms to achieve a flat, high power frequency comb source with narrow linewidth and high optical signal-to-noise ratio.
NATURE COMMUNICATIONS
(2022)
Article
Food Science & Technology
Isabel dos Santos, Gurthwin Bosman, Wessel du Toit, Jose Luis Aleixandre-Tudo
Summary: Phenolic compounds play important roles in wine quality attributes such as colour, mouthfeel and ageing potential. Front-face fluorescence spectroscopy presents itself as a user-friendly, rapid and cost-effective alternative to other spectrophotometric methods for monitoring phenolic content in red wine samples during fermentation. The study investigated the potential of fluorescence spectroscopy to directly measure phenolic content and explored the influence of fermentation conditions on prediction accuracy.
Article
Optics
Pascal Hanzi, Benoit Sierro, Zhixin Liu, Valerio Romano, Anupamaa Rampur, Alexander M. Heidt
Summary: The recent development of fiber supercontinuum (SC) sources with ultra-low noise levels has significantly advanced various research topics. However, satisfying the demands for maximum spectral bandwidth and minimum noise simultaneously remains a challenge. This study proposes a hybrid approach that utilizes two separate fibers optimized for nonlinear temporal compression and spectral broadening, respectively, providing new design flexibility and significant performance improvements. The results show that hybrid all-normal dispersion (ANDi) highly nonlinear fibers (HNLF) achieve broad spectral bandwidths, extremely low noise levels, and smooth spectra, making them suitable for low-noise SC sources in applications such as biophotonic imaging, coherent optical communications, and ultrafast photonics.
Article
Chemistry, Physical
Grzegorz Stepniewski, Pascal Hanzi, Adam Filipkowski, Monika Janik, Mariusz Mrozek, Yuriy Stepanenko, Robert Bogdanowicz, Valerio Romano, Alexander Heidt, Ryszard Buczynski, Mariusz Klimczak
Summary: The integration of nanodiamonds with optical fibers has been shown to be a compelling methodology for magneto-optics. This study reveals that nanodiamonds can be utilized for nonlinear optics by manipulating the nonlinear response of glasses. The experiments demonstrate a reduction in the nonlinear refractive index of materials containing nanodiamonds, providing a guideline for future research on negative nonlinearity fibers.
Proceedings Paper
Engineering, Biomedical
George Dwapanyin, Dirk Spangenberg, Thomas Feurer, Alexander Heidt, Gurthwin Bosman, Pieter Neethling, Erich Rohwer
Summary: The novel nonlinear microscopy modality i(2)PIE utilizes time-domain ptychographic phase measurement to compress supercontinuum pulses, improving contrast at reduced average power.
ADVANCES IN MICROSCOPIC IMAGING III
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Anupamaa Rampur, Dirk-Mathys Spangenberg, Grzegorz Stepniewski, Dominik Dobrakowski, Karol Tarnowski, Karolina Stefanska, Adam Pazdzior, Pawel Mergo, Tadeusz Martynkien, Thomas Feurer, Mariusz Klimczak, Alexander M. Heidt
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Dirk-Mathys Spangenberg, Benoit Sierro, Anupamaa Rampur, Pascal Hanzi, Alexander Hartung, Pawel Mergo, Karol Tarnowski, Tadeusz Martynkien, Mariusz Klimczak, Alexander M. Heidt
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Ruan Viljoen, Dirk Spangenberg, Pieter Neethling, Alexander Heide, Thomas Feurer, Erich Rohwer
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
(2021)
