Article
Optics
Wanru Zhang, Siyu Chen, Rongtao Su, Man Jiang, Can Li, Yanxing Ma, Pu Zhou
Summary: We present a single-frequency linearly-polarized gain-switched distributed feedback pulsed fiber laser, which achieves single-frequency and linearly-polarized laser pulses through parameter optimization of a phase shifted fiber Bragg grating. The optimized laser exhibits excellent performance with a narrow linewidth, high peak power, and a flexible repetition rate.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Charu Goel, Huizi Li, Jichao Zang, Seongwoo Yoo
Summary: In this study, a linearly polarized ytterbium-doped fiber laser cavity was configured by integrating an antiresonant hollow-core fiber-based inline polarizer. The compact fiber polarizer, which was fusion spliced to a commercial large-mode-area, polarization-maintaining YDF, allowed for near-diffraction-limited linearly polarized signal output with high polarization extinction ratio. The temperature insensitivity of the hollow-core fiber polarizer eliminates the need for precise temperature control required in other fiber laser cavities.
Article
Chemistry, Multidisciplinary
Shuai Ren, Pengfei Ma, Wei Li, Guangjian Wang, Yisha Chen, Jiaxin Song, Wei Liu, Pu Zhou
Summary: In this paper, we achieved a high-power all-fiber laser amplifier with narrow linewidth and near-diffraction-limited beam quality. By utilizing a phase-modulated single-frequency laser seed and a master oscillator power amplifier (MOPA) configuration, a 3.96 kW signal laser output was obtained.
Article
Optics
Jui-Tse Tsai, Chi-Ti Hsieh, Chao-Chieh Cheng, Min-Hsiung Shih, Shu-Wei Chang
Summary: In this work, a compact circularly-polarized (CP) light source for chirality-based applications at the chip level is proposed. The device scheme utilizes an in-plane submicron phase shifter instead of a traditional quarter-wave plate to generate CP light. By combining the vertical radiations from two phase-shifted light sources, compact circularly-polarized lasers are demonstrated without the need for extrinsic materials, large-area auxiliary structures, or specialized operation conditions critical for CP radiation. The fabricated devices exhibit a high degree of circular polarization, reaching up to 74%.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Shuyi Mi, Disheng Wei, Jinwen Tang, Baoquan Yao, Ke Yang, Junhui Li, Tongyu Dai, Xiaoming Duan
Summary: We demonstrated a high-efficiency, compact Ho:YLF MOPA system operating at room temperature. The optical-to-optical efficiency of the system was up to 62.8%, making it the most efficient and compact structure of its kind. The system achieved a per pulse energy of 6.1 mJ, pulse width of 22.5 ns, and peak power of 265.2 kW.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Chemistry, Analytical
Chengjie Zhu, Xuezong Yang, Yuxuan Liu, Muye Li, Yuxiang Sun, Wei You, Peng Dong, Dijun Chen, Yan Feng, Weibiao Chen
Summary: This paper investigates a tunable and narrow-bandwidth Q-switched ytterbium-doped fiber (YDF) laser. The non-pumped YDF functions as a saturable absorber and, together with a Sagnac loop mirror, provides a dynamic spectral-filtering grating to achieve a narrow-linewidth Q-switched output. By adjusting an etalon-based tunable fiber filter, a tunable wavelength from 1027 nm to 1033 nm is obtained. This work paves the way for the generation of narrow-linewidth Q-switched lasers with tunable wavelengths in conventional ytterbium, erbium, and thulium fiber bands for various critical applications.
Article
Engineering, Electrical & Electronic
Chao Zhang, Sheng-Ping Chen, Bo Li, Xiang-Ai Cheng
Summary: An all fiber linearly polarized narrow linewidth pulsed fiber laser operating at 1016 nm in a master oscillator power amplification (MOPA) configuration is demonstrated. Core-pumped double cladding ytterbium-doped large mode area fiber amplifiers are proposed as the pre-amplifiers to reduce nonlinearity and ASE. The laser exhibits an average output power of 48.6 W, similar to 18 kW peak power, and a linewidth of 0.28 nm.
IEEE PHOTONICS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Bin Zheng, Yong Fan, Yu Jian Cheng
Summary: A wideband high-efficiency transmitarray antenna with linear-to-circular polarization transformation is presented using the low-loss element design method. It consists of a linearly polarized U-slot patch antenna and a circularly polarized single-arm Archimedean spiral antenna, offering low insertion loss and good incident angle stability over a wide frequency band. The fabricated transmitarray, with 1613 elements and a thickness of 0.14-?(0), achieves a measured peak gain of 31.8 dBi and an aperture efficiency of 60.2%. The measured 1 dB gain bandwidth is 15.2% from 18.25 to 21.25 GHz. The antenna's simple structure, high performance, and low complexity make it a cost-effective and high-gain circularly polarized antenna.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Physics, Multidisciplinary
Zhang Wan-Ru, Chen Si-Yu, Su Rong-Tao, Jiang Man, Li Can, Ma Yan-Xing, Zhou Pu
Summary: This paper reports on the development of a linearly polarized single-frequency pulsed fiber laser, which achieves high-quality single-frequency pulse laser output through the use of a specific structure and optimization.
ACTA PHYSICA SINICA
(2022)
Article
Chemistry, Physical
Jiawei Chang, He Wang, Zhen Lei, Wanyi Du, Yuanyuan Huang, Yixuan Zhou, Lipeng Zhu, Xinlong Xu
Summary: The study demonstrated coherent elliptical polarized THz radiation from WSe2 under linearly polarized fs laser excitation, with the ellipticity and major axis direction of the THz wave efficiently controlled through the amplitudes and phases of the two coherent orthogonal THz wave components.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Optics
Tao Wang, Can Li, Bo Ren, Kun Guo, Jian Wu, Jinyong Leng, Pu Zhou
Summary: An all-fiber, high-power linearly polarized chirped pulse amplification (CPA) system is demonstrated experimentally. By using two cascaded chirped fiber Bragg gratings (CFBGs) to stretch the pulse duration, a maximum average output power of 612 W is achieved. The system features a high-gain Yb-doped fiber with a core diameter of 20 μm and a slope efficiency of approximately 68% at a repetition rate of 80 MHz. At the highest power, the polarization degree is 92.5% and the M-2 factor of the output beam quality is approximately 1.29. The pulse width is compressed to 863 fs with a compression efficiency of 72%, corresponding to a maximum compressed average power of 440.6 W, single pulse energy of 5.5 μJ, and peak power of about 4.67 MW. This is the highest average power of a femtosecond laser directly generated from an all-fiber linearly polarized CPA system, to the best of our knowledge.
HIGH POWER LASER SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Electrical & Electronic
Ying Wan, Jianxiang Wen, Chen Jiang, Fengzai Tang, Taximaiti Yusufu, Xiaobei Zhang, Fufei Pang, Tingyun Wang
Summary: Silica optical fiber derived from yttrium-aluminum-garnet crystals is a high-gain fiber with high rare earth ions doping concentration. A stable linearly polarized single-frequency fiber laser with high output power and conversion efficiency has been constructed using a Yb: YAG crystal-derived silica fiber. The approach presented here could have applications in various fields.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Yang He, Yanhui Ji, Haohua Wan, Deyang Yu, Kuo Zhang, Qikun Pan, Junjie Sun, Yi Chen, Fei Chen
Summary: The study focused on the performance of a MgO:PPLN-based optical parametric oscillator pumped by an all-fiber Yb-doped fiber laser, investigating factors such as pump repetition rate, pulse width, and waist diameter. Through optimization, a maximum mid-infrared power output of 10.82 W with a conversion efficiency of 13.68% was achieved, resulting in a total output power of 35.4 W.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Optics
S. Sharma, P. Elliott, S. Shallcross
Summary: This study reveals that valley coupling is a general effect on femtosecond time scales, not limited to circularly polarized light. Two time-separated linearly polarized pulses can provide almost complete control over valley excitation, with the pulse time difference and polarization vectors being key parameters.
Article
Physics, Multidisciplinary
Si-Yu Chen, Hai-Qin Deng, Wan-Ru Zhang, Yong-Ping Dai, Tao Wang, Qiang Yu, Can Li, Man Jiang, Rong-Tao Su, Jian Wu, Pu Zhou
Summary: We present a single-frequency linearly polarized Q-switched fiber laser using an Nb2GeTe4 saturable absorber (SA). The Nb2GeTe4 SA enables passive Q-switching of the laser, while an unpumped Yb-doped fiber combined with a 0.08-nm-bandwidth polarization-maintaining fiber Bragg grating (FBG) acts as an ultra-narrow bandwidth filter for single-longitudinal-mode (SLM) oscillation. All devices in the laser are kept polarized to ensure linearly polarized laser output. Stable SLM linearly polarized Q-switching operation at 1064.6 nm is achieved, resulting in a laser with a shortest pulse width of 1.36 μs, a linewidth of 28.4 MHz, a repetition rate of 28.3 kHz-95.9 kHz, and a polarization extinction ratio of about 30 dB. The single-frequency linearly polarized pulsed fiber laser studied in this paper has significant application value in gravitational wave detection, beam combining, nonlinear frequency conversion, and other fields.
Article
Optics
V. D. Efremov, E. A. Evmenova, A. A. Antropov, D. S. Kharenko
Summary: Numerical simulation was carried out on a fiber optic parametric oscillator to generate picosecond narrowband pulses for coherent anti-Stokes Raman spectroscopy. The simulation utilized an open-source Python-based library and a graphic processor unit to accelerate the process. The study identified the stable regions for different lengths of fibers and demonstrated the generation of high-energy dissipative solitons around 800 nm wavelength.
Article
Engineering, Electrical & Electronic
N. Kalmykov, D. A. Kovalenko, I. A. Lobach, S. Kablukov
Summary: This study investigates the impact of spontaneous emission-induced noise on the reflectogram shape deformation in a distributed temperature sensor based on Raman scattering. It was found that the use of erbium-doped amplifiers can lead to temperature measurement errors, but filtering the radiation with an amplitude modulator can reduce these deviations. The influence of spontaneous emission on reflectograms was studied both theoretically and experimentally.
QUANTUM ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
A. G. Kuznetsov, S. Kablukov, E. Podivilov, S. A. Babin
Summary: The study investigates the spatial characteristics of the beam output from a multimode-pumped SRS cascade laser by measuring the intensity profiles of transmitted pump radiation beams and different orders of Stokes SRS generation. Results show significant differences in the dynamics of changes in intensity profiles between the two considered resonator configurations. Analysis is done within a balance model of interaction between pump radiation and the Stokes components of the SRS to understand their relationship.
QUANTUM ELECTRONICS
(2021)
Article
Multidisciplinary Sciences
Sergey A. Babin, Alexey G. Kuznetsov, Oleg S. Sidelnikov, Alexey A. Wolf, Ilya N. Nemov, Sergey Kablukov, Evgeniy Podivilov, Mikhail P. Fedoruk, Stefan Wabnitz
Summary: Multimode fibres provide a promising platform for increasing fibre link capacity and fibre laser output power. The complex spatiotemporal dynamics of multimode beams can be controlled through nonlinear, dispersive, and dissipative effects. Raman nonlinearity induces beam cleanup in long graded-index fibres, offering a breakthrough approach for wavelength-agile high-power lasers within a laser cavity.
SCIENTIFIC REPORTS
(2021)
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
A. M. Volikova, I. A. Lobach, S. Kablukov
Summary: This study demonstrates a vibrometer-rangefinder based on the principles of coherent optical frequency-domain reflectometry (C-OFDR). By using a self-sweeping ytterbium-doped fiber laser as a tunable source of probe radiation, it is possible to measure target vibrations within a distance range. The method allows for measuring vibrations with an amplitude down to 5 nm in a frequency range from 2 Hz to 5 kHz.
Article
Optics
Alexey G. Kuznetsov, Sergey I. Kablukov, Yuri A. Timirtdinov, Sergey A. Babin
Summary: This article presents recent experimental results on the pulsed regimes of Raman conversion in multimode graded-index fibers. Different linear cavities for Raman fiber laser with modulation of losses or gain are explored and compared. The experiments show that nanosecond pulses can be observed under mode-locking conditions, with greatly improved beam quality compared to the pump diode.
Review
Optics
Nikita R. Poddubrovskii, Roman Drobyshev, Ivan A. Lobach, Sergey Kablukov
Summary: This paper reviews the research progress on fiber lasers based on long dynamic population gratings (DPGs). Depending on the type, length, and position of the DPGs, they can be used for various purposes, such as stabilizing single-frequency radiation or enabling regular wavelength self-sweeping. These lasers have the advantage of a simple design and do not require special spectral elements or drivers for spectrum control.
Article
Optics
N. R. Poddubrovskii, I. A. Lobach, S. I. Kablukov
Summary: This study reports the transition from single longitudinal mode operation to regular mode-hopping dynamics in an Erbium-doped ring fiber laser with a saturable absorber. By increasing the pump power and elongating the length of the absorbing fiber, the laser can switch from wavelength stabilization to wavelength self-sweeping. This effect is associated with the interplay of amplitude and phase dynamic gratings. Additionally, this study demonstrates continuous wave single-frequency self-sweeping operation for the first time in an Erbium-doped fiber laser. These findings are significant for the development of both single-frequency and self-sweeping lasers.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Engineering, Multidisciplinary
A. Yu. Tkachenko, I. A. Lobach, S. I. Kablukov
Summary: This paper reviews the achieved results of coherent optical frequency reflectometry (COFR) based on a source of frequency-tunable radiation called a fiber self-scanning laser. It demonstrates that the developed COFR can be used for various tasks such as characterizing optical elements, sensors, vibration measurement, and gas analysis, with submillimeter spatial resolution and lengths of several tens of meters. The prospects for the future development of this trend are also discussed.
INSTRUMENTS AND EXPERIMENTAL TECHNIQUES
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
A. E. Budarnykh, I. A. Lobach, S. Kablukov
Summary: We reported a Tm-doped self-sweeping fiber laser operating at 2 μm spectral range with a stabilized pulse repetition rate. By synchronizing an acousto-optical modulator with the laser pulses, we improved the stability of the pulse train and reduced the relative stability error to 1%, bringing new possibilities for remote gas analysis and LIDAR applications.
ADVANCED SENSOR SYSTEMS AND APPLICATIONS XII
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Alexey G. Kuznetsov, Alexey A. Wolf, Ilya N. Nemov, Sergey Kablukov, Sergey A. Babin
Summary: This study investigates the transmission characteristics of low-coherent and highly-multimode pump radiation in graded-index fibers (GIF) and step-index fibers (SIF). The results show that the output beam shape is almost independent of the input pump beam shape after propagating a certain distance in the fibers, and it mimics the refractive-index profile in the core of the multimode fiber. This indicates that the Raman gain is nearly the same for all transverse modes in SIF, while it has maximum gain for the fundamental mode in GIF, which is the main reason for the strong Raman beam cleanup effect in GIF.
MICRO-STRUCTURED AND SPECIALTY OPTICAL FIBRES VII
(2022)
Proceedings Paper
Electrochemistry
Alexey G. Kuznetsov, Ilya N. Nemov, Alexey A. Wolf, Sergey Kablukov, Sergey A. Babin
Summary: Graded-index fibers enable efficient Raman conversion of multimode radiation into a Stokes beam with improved beam quality, offering a new approach for high-brightness diode-pumped all-fiber tunable lasers. The study explores the opportunity to broaden the operating wavelength range via cascaded Raman lasing in such scheme. Half-open cavity shows higher conversion efficiency, while linear cavity has lower threshold for the third-order generation.
NONLINEAR FREQUENCY GENERATION AND CONVERSION: MATERIALS AND DEVICES XXI
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
A. D. Vladimirskaya, I. A. Lobach, S. Kablukov
Summary: This article presents an experimentally demonstrated linearly polarized self-sweeping Ho-doped fiber laser operating near 2100 nm. The laser is capable of wavelength tuning within a range of 10 nm without the need for any spectral filters.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
Article
Optics
Alexey G. Kuznetsov, Sergey Kablukov, Evgeny Podivilov, Sergey A. Babin
Summary: This study demonstrates an efficient method for converting highly-multimode pump beams into high-quality Stokes beams, achieving brightness enhancement for Raman lasers. The analysis of Stokes beam generation and pump beam hole formation provides insights into the discrepancies observed in the experimental results.
