Article
Chemistry, Multidisciplinary
Binghao Yu, Qiang Hao, Cheng Tang, Kangwen Yang, Huaixi Chen, Wanguo Liang, Heping Zeng
Summary: In this paper, we demonstrate the creation of a femtosecond green laser using a MgO-doped periodically poled lithium niobate crystal pumped by a home-made Yb-doped MOPA laser system. The laser system produces stable laser pulses with high conversion efficiency and low intensity fluctuations, making it suitable for two-photon photopolymerization applications.
APPLIED SCIENCES-BASEL
(2022)
Article
Materials Science, Ceramics
Jong Seon Park, Jin Phil Kim, Ye Jin Oh, Hye Mi Park, Eun Ji Park, Ji Won Kim, Hoon Jeong, Jaesun Kim
Summary: This study reports the spectroscopic and lasing characteristics of a ytterbium-doped silica-based rod fabricated by vapor-phase axial deposition technology. The maximum absorption cross section is found at 978 nm, with a value of 3.84 x 10-19 cm2, while the maximum emission cross section is observed at 980 nm, with a value of 4.23 x 10-19 cm2. The fluorescent lifetime is measured to be 974 μs. The application of the ytterbium-doped silica rod as a laser amplifier results in an output of 72 W of amplified continuous-wave at 1030 nm, with a slope efficiency of 28%. The prospects of power scaling and achieving good beam quality are discussed.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Optics
Jacek Kwiatkowski, Jaroslaw Sotor
Summary: The translation presents a Ho:YAG laser's performance and characteristics, achieving dual-wavelength laser emission through adjustments of different parameters, while maintaining a high optical-to-optical conversion efficiency.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Physics, Applied
Junfeng Wang, Xiushan Zhu, Robert A. Norwood, Nasser Peyghambarian
Summary: Dysprosium-erbium co-doped ZBLAN fiber lasers operating at 3.2-3.35 mu m by pumping at the 980nm Er3+ absorption band were demonstrated, achieving different output powers and efficiencies at different wavelengths. The experiments confirmed the feasibility of pumping the Dy3+/Er3+-doped ZBLAN fiber laser with a low-cost high efficiency diode laser at 976nm.
APPLIED PHYSICS LETTERS
(2021)
Article
Optics
Samuel Paul David, Venkatesan Jambunathan, Fangxin Yue, Antonio Lucianetti, Tomas Mocek
Summary: This study presents the performance of diode-pumped Yb:LuAG lasers in cryogenic conditions in both continuous wave and pulsed modes, with a focus on the optimal crystal temperature of 140K. The use of Cr:YAG saturable absorbers for passive Q-switching resulted in significant improvements in pulse energy and peak power.
OPTICS AND LASER TECHNOLOGY
(2021)
Review
Optics
Peijin Shang, Lu Bai, Shiyu Wang, Defang Cai, Bingbin Li
Summary: This paper focuses on the control and treatment of thermal effects in laser systems, particularly the thermal lens effect and end face deformation caused by heat. Three methods are proposed: improving pump characteristics, optimizing medium layout, and adjusting the resonator structure.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
D. Palla, L. Labate, F. Balligi, G. Cellamare, L. A. Gizzi
Summary: A model for calculating the pump energy coupling in a disk amplifier is proposed. The model allows the calculation of overall pump energy coupling and absorption 3D map for different geometric diode bar arrangements. The study shows that by fulfilling a set of fundamental conditions, the precise arrangement and focusing of the diode bars can be tuned to achieve the desired energy absorption spatial distribution while maintaining the highest overall energy coupling.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Optics
Jian Lei, Le Zhang, Yawen Li, Xueshuang Deng, Jianqiang He, Lin Zhang, Yang Liu
Summary: We developed a high-power continuous-wave (CW) 1048 nm Yb:YAG laser oscillator with a folded cavity structure and achieved a maximum output power of 1330 W and a beam quality of 1.7 times the diffraction limit. This work provides a useful platform for developing 1048 nm lasers with higher power and beam quality.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Simone Dabbene, Riccardo Gotti, Daniel Jedrzejczyk, Arne Heinrich, Manuel Messner, Antonio Agnesi, Federico Pirzio
Summary: In this work, a novel amplification module based on a high-brilliance tapered pump laser diode is presented. The module achieves a maximum output power of about 6.5 W with high spatial quality and a stable diode wavelength of 978.5 nm. By optimizing the performance, compact amplification modules can maximize the gain-per-Watt of absorbed pump power and the optical-to-optical extraction efficiency.
OPTICS COMMUNICATIONS
(2023)
Article
Crystallography
Yanqiu Du, Tongyu Dai, Hui Sun, Hui Kang, Hongyang Xia, Jiaqi Tian, Xia Chen, Baoquan Yao
Summary: The research describes cryogenically cooled Tm, Ho: GdVO4 lasers operating at an emission wavelength of 2.05 µm in both continuous wave and pulse mode, achieving maximum output power of 7.4 W and peak power of 9.9 kW, respectively. Different output characteristics were observed by altering the transmittance of output couplers for continuous wave lasers and changing pump mode radius for passively Q-switched lasers.
Article
Engineering, Electrical & Electronic
Lu Zhang, Junxiang Zhang, Quan Sheng, Shijie Fu, Yanyan Li, Chaodu Shi, Wei Shi, Jianquan Yao
Summary: In this study, a novel method was proposed and demonstrated to achieve pulsed operation of thulium-doped fiber lasers at 1.7 μm. By embedding the thulium-doped fiber laser cavity within the cavity of an erbium/ytterbium-codoped fiber laser operating at 1.5 μm, the 1.5 μm laser was forced to operate in a passively Q-switched scheme using the thulium-doped fiber as a saturable absorber. The thulium-doped fiber laser at 1.7 μm was then pumped by the Q-switched 1.5 μm laser and gain-switched. The experimental results matched well with the theoretical model, providing insights for further improving the laser performance.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Leonid V. V. Kotov, Valery Temyanko, Mikhail M. M. Bubnov, Denis S. S. Lipatov, Alexey S. S. Lobanov, Alexey Abramov, Svetlana S. S. Aleshkina, Alexey N. N. Guryanov, Mikhail E. E. Likhachev
Summary: In this study, high-energy single frequency transform-limited Er-doped amplifiers were pumped by a specially developed Yb-doped fiber laser at 980 nm and a Raman laser at 1480 nm. It was found that pumping at 1480 nm allows achieving slightly higher maximum pulse energy for long pulses in the absence of nonlinear effects. On the other hand, amplifiers with a pump at 980 nm have a higher threshold of stimulated Brillouin scattering (SBS), enabling higher peak power of shorter pulses. Lasers with more than 730 mu J pulse energy and with higher than 3.5 kW peak power were demonstrated.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Alexander Vakhrushev, Yan Ososkov, Sergey Alyshev, Aleksandr Khegai, Andrey Umnikov, Fedor Afanasiev, Konstantin Riumkin, Elena Firstova, Alexey Guryanov, Mikhail Melkumov, Sergei Firstov
Summary: The output power characteristics of cladding-pumped lasers based on bismuth-doped phospho- and germanosilicate core glass fibers were studied and analyzed in this article. The developed lasers can provide several hundred milliwatts of output power with a close to 1% slope efficiency. It was found that the Bi-doped germanosilicate fiber laser shows output power saturation, while the Bi-doped phosphosilicate fiber laser does not. The relaxation time of the bismuth active centers (BACs) has a significant impact on the laser efficiency and achieved output power.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Wensong Li, Yulun Wu, Shihang Xu, Peng Wang, Yuan Chen, Dawid Piatkowski
Summary: Researchers have successfully developed a blue dual-wavelength pumping method for directly diode-pumped Holmium-doped ZrF4-BaF2-LaF3-AlF3-NaF (Ho:ZBLAN) fiber lasers. This study is of great significance for expanding the application of dual-wavelength pumping to visible laser systems with energy-level structures consisting of long-lived lower-level bottlenecks.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Mengyun Hu, Jiawei Shen, Yuzhi Cao, Shuai Yuan, Heping Zeng
Summary: We present a fundamentally mode-locked Yb-doped solid-state fiber laser with a repetition rate of 1 GHz and a pulse duration of 48 fs. By employing nonlinear-polarization-evolution (NPE) mode-locking, the laser achieves an average power of up to 286 mW and a spectrum bandwidth of 26 nm, supporting a 48 fs pulse duration. The laser can self-start and the central wavelength is tunable from 1032.4 nm to 1035.6 nm. To the best of our knowledge, this is the shortest pulse duration directly obtained by GHz fundamentally mode-locked Yb-fiber lasers.
