Article
Optics
Yuxia Zhang, Liang Dong, Wenjuan Han, Honghao Xu, Degao Zhong, Junhai Liu
Summary: We present the performance of a Yb:YPO4 microchip laser with a 2D WS2 saturable absorber, which shows high efficiency operation in both continuous-wave (CW) and passive Q-switching mode. The laser generated a CW output power of 3.81 W with an optical conversion efficiency of 60.5% and a slope efficiency of 71% when absorbing 6.30 W of pump power. In the passive Q-switching mode, a pulsed output power of 1.67 W was achieved at a repetition frequency of 660 kHz, with a slope efficiency of 52%. By using different output mirrors, pulse energy, pulse width, and peak power of 2.52 μJ, 67 ns, and 31.7 W, respectively, were obtained. These results represent a significant improvement in the CW and passive Q-switching performance of Yb:YPO4 microchip lasers.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Yangxiao Wang, Jingjing Liu, Xiaoyue Feng, Zhonghan Zhang, Yunfei Wang, Zhen Zhang, Fengkai Ma, Jie Liu, Liangbi Su
Summary: Ho,Pr:CaF2 single crystals were grown by modified temperature gradient technique method (TGT). A systematic study on the fluorescence characteristics around 2.9 µm has been carried out on this kind of materials for the first time, to the best of our knowledge. After co-doping with Pr3+, the population inversion is much easier to realize and the ratio of populations between the upper and lower energy levels is highest among the reported materials, which shows the Ho,Pr co-doped CaF2 is a kind of promising materials. The continuous-wavelength (CW) laser operation has been achieved with the maximum output power of 154 mW on 1%Ho,0.1%Pr:CaF2 crystals. It's the first report about the CW laser output on Ho-doped CaF2 single crystals.
Article
Instruments & Instrumentation
Jiaze Wu, Youlun Ju, Xiaoming Duan, Yu Ding, Jiawei Fan, Ying Chen, Tianwen Gao, Tongyu Dai
Summary: This paper demonstrates a 2047.9-nm acousto-optically Q-switched Ho:GdVO4 laser pumped by two laser diodes at 1.94 µm. In continuous-wave mode, a maximum output power of 8.08 W and a slope efficiency of 45.7% were achieved using a 1.0 at.%-doped Ho:GdVO4 crystal as the gain medium. In Q-switch mode, the highest pulse energy of 1.29 mJ and a peak power of 300.5 kW were obtained at a pulse repetition frequency of 5 kHz. Furthermore, the beam quality factor (M-2) was estimated to be 1.6 at the maximum output level using the 90/10 knife-edge method. To the best of our knowledge, this is the first operation of an acousto-optically Q-switched Ho:GdVO4 laser directly pumped by laser diode.
INFRARED PHYSICS & TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Xianzhong Zhang, Kai Zhong, Hongzhan Qiao, Fangjie Li, Yizhe Zheng, Degang Xu, Jianquan Yao
Summary: By varying the pump wavelength, the power ratio and pulse interval of a passively Q-switched dual-wavelength laser can be tuned, with experimental results agreeing well with simulation results.
IEEE PHOTONICS JOURNAL
(2021)
Article
Optics
Shuhui Lv, Congcong Gao, Zhen Tian, Xiancui Su, Guoju Wang, Guo Zhu, Beibei Wang, Santosh Kumar, Xiaodong Xu, Haijuan Yu, Xuechun Lin, Jun Xu, Bingyuan Zhang
Summary: This paper demonstrated a continuous-wave dual-wavelength Yb:LuYAG laser that operates at 1029.41 and 1047.16 nm simultaneously, with the laser operation state adjusted continuously by changing the angle of the cavity mirror. Additionally, passive Q-switched operation was achieved at 1028.99 nm using a MoS2 saturable absorber, with pulse duration and maximum repetition rate of 293 ns and 251.27 kHz, respectively.
OPTICS COMMUNICATIONS
(2021)
Article
Optics
Jorg Koerner, Venkatesan Jambunathan, Fangxin Yue, Juergen Reiter, Petr Navratil, Samuel Paul David, Antonio Lucianetti, Joachim Hein, Tomas Mocek, Malte C. Kaluza
Summary: A diode-pumped, electro-optically Q-switched Tm:YAG laser with a cryogenically cooled laser crystal was presented, demonstrating different output pulse durations and energies in various configurations. Design constraints on maximizing energy storage capability in a pulse pump approach were discussed using a simplified rate equation model.
HIGH POWER LASER SCIENCE AND ENGINEERING
(2021)
Article
Optics
Ye Jin Oh, Jong Seon Park, Eun Ji Park, Ji Won Kim, Hoon Jeong
Summary: Direct generation of cylindrical vector vortex (CVV) laser output is achieved in a Nd:YVO4 laser with the incorporation of an S-waveplate and an etalon. The orientation angle of the intracavity S-waveplate determines the radial or azimuthal polarization of the laser output. This technique produces continuous-wave CVV output at 1064 nm with radial or azimuthal polarization, as well as right or left-handedness wavefront helicity due to the etalon. Q-switched operation is also demonstrated, generating CVV pulses with high pulse energy and short duration.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Huangjun Zeng, Wenze Xue, Robert T. Murray, Weidong Chen, Zhongben Pan, Li Wang, Chen Cui, Pavel Loiko, Xavier Mateos, Uwe Griebner, Valentin Petrov
Summary: In this study, we investigated the in-band pumping of a Tm,Ho,Lu:CaGdAlO4 laser using a Raman-shifted Er-fiber laser. We achieved high output power and wide wavelength tuning range in the continuous-wave regime and high repetition rate pulse output in the mode-locked regime.
APPLIED SCIENCES-BASEL
(2023)
Article
Optics
L. B. Zhou, J. Y. Zou, W. X. Zheng, T. Zhang, B. Xu, X. D. Xu, A. A. Lyapin, J. Xu
Summary: The study presents the recent progress on continuous-wave and passively Q-switched Pr,Mg:SrAl12O19 bulk lasers using a 24-W diode laser as the pump source, demonstrating their potential for visible laser generation.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Optics
Jiajia Mao, Ping Hu, Xue Zhou, Jingkun Zhang, Ruihua Wang, Hongkun Nie, Jintian Bian, Baitao Zhang, Tao Li, Jingliang He, Kejian Yang
Summary: A high-performance diode-tandem-pumped actively Q-switched Tm:YAP laser is demonstrated, achieving a maximum output power of 10.6 W with a pulse width of 37 ns, a pulse energy of 2.12 mJ, and a peak power of 57.3 kW at a pulse repetition rate of 5 kHz. Comparatively, an actively Q-switched Tm:YAP laser with a single gain crystal double-end pumped obtains a maximum output power of 6.8 W with a pulse width of 45 ns, a pulse energy of 1.36 mJ, and a peak power of 28.3 kW at the same pulse repetition rate. The experimental results clearly reveal the effect of diode-tandem-pumping regime on lowering down the thermal load of gain medium.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Wensheng Zhang, Qiong Gao, Sheng Zhou, Linjun Li, Xinzhi Ma
Summary: This paper demonstrates a diode-pumped acousto-optical Q-switched Ho:GTO laser with achieved maximum output power and pulse energy at different repetition rates, and calculated the corresponding peak power. Additionally, the authors estimated the beam quality factors of the laser.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Optics
Xiaoming Duan, Jiaze Wu, Yu Ding, Xiaotao Yang, Tongyu Dai
Summary: In this paper, a continuous-wave and electro-optically (EO) Q-switched Ho-doped lutetium vanadate (Ho:LuVO4) laser, dual end-pumped by two laser diodes at 1.94 μm, is reported. The continuous-wave regime achieved a maximum output power of 18.8 W at 2058.1 nm, with a slope efficiency of 54.1% relative to the absorbed pump power of 44.7 W. By using a langasite (La3Ga5SiO14, LGS) crystal as the EO Q-switch, the EO Q-switched Ho:LuVO4 laser produced a maximum pulse energy of 3.2 mJ and a minimum pulse width of 8.9 ns at a pulse repetition frequency of 3 kHz, resulting in a peak power of 358.8 kW.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Xiaofang Yang, Zhongqing Fang, Weibin Kong, Rugang Wang
Summary: We demonstrate an efficient continuous-wave (CW) and Q-switched Tm:LuYAG laser resonantly pumped by an Er:LuYAG laser. The maximum CW output power is 3.12 W with a slope efficiency of 51.4% relative to the incident pump power. In the Q-switched mode, stable laser pulses are achieved from 1 to 10 kHz repetition frequency under the maximum incident pump power of 7 W. The narrowest pulse width of 94 ns with a pulse energy of 2.12 mJ is obtained at 1 kHz, resulting in the highest single pulse peak power of 22.5 kW. The Tm:LuYAG laser emits at a wavelength of 2018.37 nm with a high-beam quality M-2 < 1.2.
OPTICAL ENGINEERING
(2022)
Article
Optics
Wensheng Zhang, Linjun Li, Qiong Gao, Sheng Zhou
Summary: In this study, a diode-pumped electro-optically Q-switched Ho:GTO laser was presented, utilizing a langasite crystal as the EO Q-switch. The laser achieved a high peak power and excellent beam quality factors.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Optics
Jun Guo, Jian Liu, Jie Xu, Bin Xu, Yuchong Ding, Xiaodan Wang, Xiaodong Xu, Jun Xu
Summary: This work presents the development of high-performance continuous-wave and passively Q-switched Nd:SRA lasers by doping rare-earth ions. The lasers achieved high output power and slope efficiency in continuous-wave operation. By using a YAG etalon, a high-power 1066 nm laser was successfully demonstrated. Passively Q-switched operation using Cr4+:YAG as a saturable absorber achieved a short pulse width and high pulse power.
CHINESE OPTICS LETTERS
(2022)
Article
Materials Science, Ceramics
Haoyi Wang, Delong Cai, Zhihua Yang, Xiaoming Duan, Bingzhu Wang, Bo Wang, Daxin Li, Dechang Jia, Yu Zhou
Summary: In this study, a boron nitride-magnesium aluminum silicate (BN-MAS) composite ceramics were fabricated using hot-press sintering at different temperatures. The relationship between sintering temperature and microstructure was investigated, showing that h-BN had a significant inhibitory effect on the crystallization of the MAS system at temperatures above 1400 degrees C. The composite sintered at 1700 degrees C exhibited the highest bending strength.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Engineering, Industrial
Xiaoming Duan, Qi Li, Weiran Xie, Xiaodong Yang
Summary: A novel wire arc metal additive manufacturing method using pulsed arc plasma (PAP-WAAM) was developed to address the materials processing challenges resulting from high heat input in wire arc additive manufacturing (WAAM). The PAP-WAAM process reduced heat input, increased cooling rates, and produced finer geometric features and microstructures compared to the conventional gas tungsten arc welding-based WAAM (GT-WAAM) process.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2023)
Article
Optics
Jiawei Fan, Jiaze Wu, Youlun Ju, Baoquan Yao, Xiaoming Duan, Tongyu Dai
Summary: This paper investigates a ring cavity of Er:YAG laser with a single corner cube prism. By changing the angle of the lambda/4 plate according to the calculation results of Jones matrix, the tunable output coupling ratio ranges from 0.25% to 72.67% due to the depolarization effect of the corner cube. An experiment is conducted to check the anti-detuning performances of the single corner cube cavity, and the results show stable output power at certain rotating angles. Under continuous wave operation, a vertically-polarized laser of 5.4 W at 1645.1 nm is obtained, with the beam quality factors (M-2) of 1.17 in the x direction and 1.42 in the y direction, and a slope efficiency of 45.47%. Additionally, a maximum pulse energy of 2.2 mJ and a peak power of 25.58 KW are achieved at a pulse-repetition-frequency (PRF) of 200 Hz and a pump power of 29.04W, with a minimum pulse width of 86 ns.
OPTICAL ENGINEERING
(2023)
Article
Optics
Xiaoming Duan, Jiaze Wu, Yu Ding, Xiaotao Yang, Tongyu Dai
Summary: In this paper, a continuous-wave and electro-optically (EO) Q-switched Ho-doped lutetium vanadate (Ho:LuVO4) laser, dual end-pumped by two laser diodes at 1.94 μm, is reported. The continuous-wave regime achieved a maximum output power of 18.8 W at 2058.1 nm, with a slope efficiency of 54.1% relative to the absorbed pump power of 44.7 W. By using a langasite (La3Ga5SiO14, LGS) crystal as the EO Q-switch, the EO Q-switched Ho:LuVO4 laser produced a maximum pulse energy of 3.2 mJ and a minimum pulse width of 8.9 ns at a pulse repetition frequency of 3 kHz, resulting in a peak power of 358.8 kW.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Junhui Li, Disheng Wei, Baoquan Yao, Shuyi Mi, Ke Yang, Jinwen Tang, Tongyu Dai, Xiaoming Duan, Youlun Ju
Summary: This paper presents a Langasite (LGS) electro-optic Ho:YAG cavity-dumped laser that suppresses the gain dependence of pulse duration. The application of this laser in mid-infrared ZnGeP2 (ZGP) optical parametric oscillator (OPO) has been realized for the first time. The results show a stable pulse train and short pulse duration for high-power mid-infrared ZGP OPOs.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Jiaze Wu, Youlun Ju, Xiaoming Duan, Renpeng Yan, Yu Ding, Dong Yan, Yuechu Wu, Tongyu Dai, Jiawei Fan
Summary: We demonstrated a high peak power electro-optically Q-switched Ho:GdVO4 laser directly pumped by a 1.94 μm laser diode. The laser achieved a maximum output power of 6.5 W in continuous-wave mode and a pulse energy of 3.25 mJ in pulse mode. This is the first demonstration of such a laser with these characteristics.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Bo Niu, Delong Cai, Zhihua Yang, Xiaoming Duan, Wenjiu Duan, Donghui Long, Shuzhou Li, Dechang Jia, Yu Zhou
Summary: The high-temperature dielectric loss of hexagonal boron nitride (h-BN) ceramics can be reduced by orienting grains, leading to a minimized defect ions transport and lower dielectric loss.
SCRIPTA MATERIALIA
(2023)
Article
Optics
Tianwen Gao, Ziyi Liu, Rui Zhang, Hongzhang Ma, Jiaqi Xun, Mingyu Shao, Xiaoming Duan, Li Li, Xiaotao Yang
Summary: We propose a 2μm Tm: YAP passively Q-switched solid-state laser based on SnSe2 saturable absorber. The laser achieves an output power of 430mW, a shortest pulse width of 810.7ns, a maximum repetition frequency of 59.55kHz, a single pulse energy of 7.22μJ, and a peak power of 8.9W. The beam quality factor Mx(2) is measured to be 1.43 under the maximum output power, which is the first time that such pulse width is achieved in a solid-state laser using a Tm: YAP crystal and SnSe2 as the saturation absorber.
JOURNAL OF RUSSIAN LASER RESEARCH
(2023)
Article
Engineering, Electrical & Electronic
Tianqi Qi, Haibin Wu, Mingfeng Li, Xueling Hou, Yingjie Shen, Xiaoming Duan, Wencheng Lu, Yingdong Bi, Guomin Zhang, Zigang Pu, Shuang Yu, TianHao Zong, Linjun Li, Yuqiang Yang
Summary: In this paper, a compact diode-pumped continuous wave (CW) and passively Q-switched mode-locked (QML) Tm:YAG laser operating at the F-3(4)-H-3(6) transition is demonstrated using tantalum aluminum carbide (Ta4AlC3) phase ceramic (MAX) material as a saturable absorber (SA). The first stable QML operation at 2012.38 nm is achieved with a Ta4AlC3-SA, generating a maximum average output power of 560 mW, a pulse duration of 541 ps, and a repetition rate of 168 MHz. The experiment shows that Ta4AlC3-SA is an attractive candidate for diode-pumped CW and QML mid-infrared all-solid-state lasers emitting around 2.0 μm.
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2023)
Article
Optics
Ke Yang, Baoquan Yao, Chunxiao Li, Jiyong Yao, Shuyi Mi, Jinwen Tang, Disheng Wei, Junhui Li, Xiao Xiao Hua, Xiaoming Duan, Tongyu Dai
Summary: This study demonstrates a non-critical phase-matching (NCPM) BaGa4Se7 (BGSe) optical parametric oscillator (OPO) using a home-made acousto-optic (AO) Q-switched Ho:YLF laser as the pump source. The idler wavelength tunability ranges from 9393.3 to 10627.4 nm with a temperature adjustment of 30.85 nm/C. The OPO achieved an average output power of 200 mW at 10219 nm with a pulse repetition frequency (PRF) of 200 Hz, and the slope efficiency and pump-to-idler efficiency were measured to be 8.04% and 5%, respectively. Despite deriving a refined Sellmeier Equation (S-E) based on experimental discrepancies, the deviations between the experimental data and theoretical calculations during NCPM experiments were still significant, indicating a possible lack of precision in the thermo-optic dispersion formula dn/dT for the NCPM BGSe crystal in the 10 μm wavelength range.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Engineering, Manufacturing
Yitian Yang, Zhihua Yang, Xiaoming Duan, Peigang He, Delong Cai, Dechang Jia, Yu Zhou
Summary: Additive manufacturing of large-size Si3N4 ceramic with complex structures is achieved using long-term stable hydrogel-based suspensions. The rheology relation between ceramic suspensions and carboxymethyl cellulose hydrogels is analyzed, and the effects of shear-thinning behavior and evaporation rate on filament shape are investigated. A single-wall cone component with specific dimensions is successfully printed using pseudoplastic CMC hydrogel-containing suspension.
ADDITIVE MANUFACTURING
(2023)
Article
Instruments & Instrumentation
Jiawei Fan, Jiaze Wu, Chenchen Jiang, Dong Yan, Yuechu Wu, Xingbang Yang, Xiaoming Duan, Youlun Ju, Tongyu Dai
Summary: We have demonstrated a continuous-wave, single-longitudinal-mode Er:YAG laser and its amplifier with a corner cube retroreflector based on the Faraday effect. The laser achieved a maximum power of 1.02 W at a central wavelength of 1645.46 nm, with a line-width of 204 kHz. The single-longitudinal-mode laser was further amplified to an output power of 1.86 W using a double-pass amplifier. The results highlight the potential of the unidirectional operation ring laser in combination with the corner cube prism for high-power and stability in the mid-infrared range.
INFRARED PHYSICS & TECHNOLOGY
(2023)
Article
Optics
Dong Yan, Yunpeng Wang, Yue Yuan, Xiaoming Duan, Jiawei Fan, Jiaze Wu, Youlun Ju, Sining Li, Tongyu Dai, Guangchao Ye
Summary: This paper presents a single-frequency injection-seeded laser using two corner cube reflectors in a Q-switched Ho:YAG laser. The Ho:YAG NPRO, serving as a seed laser, operates at a wavelength of 2090.6964 nm with an output power of 1.8 W. Under injection-seeded conditions, a single-frequency pulse energy of 6.8 mJ with a pulse width of 166 ns is achieved, and the Q-switched Ho:YAG laser operates at a repetition rate of 100 Hz. The Ho:YAG single-pass amplifier scales the single-frequency energy from 6.8 mJ to 32.3 mJ, and the pulsed spectrum has a half-width of 2.84 MHz. The Ho:YAG amplifier demonstrates beam quality of 1.1 and 1.17 in the x and y axes, respectively.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Chemistry, Physical
Fugang Lu, Ce Wang, Zhanguo Liu, Panpan Lin, Zhiyuan Wang, Jincheng Lin, Jiujie Xu, Peng He, Tiesong Lin, Xiaoming Duan
Summary: Doping Yb3+ in LLZO can enhance ion conductivity, inhibit abnormal grain growth, and accelerate the sintering process. Li7La3-xYbxZr2O12 samples were successfully prepared, and LLYZO (x = 0.15) exhibited the highest conductivity and relative density after sintering at 1200℃ for 15 hours.
SOLID STATE IONICS
(2023)
Article
Optics
Dong Yan, Yue Yuan, Yunpeng Wang, Jiawei Fan, Jiaze Wu, Xiaoming Duan, Sining Li, Tongyu Dai, Youlun Ju
Summary: A high-energy, alignment-insensitive, injection-seeded Q-switched Ho:yttrium aluminum garnet (YAG) single-frequency laser is developed. It provides a single-frequency pulsed output using injection-seeded technology, with a pulse energy scaled up to 33.3 mJ after amplification.
HIGH POWER LASER SCIENCE AND ENGINEERING
(2023)
