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学者姓名：李强
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Abstract ：
We present a dual-wavelength laser source obtained by spectral beam combining of two solid-state Nd:YAG pulsed lasers. The central wavelengths were locked at 1061.5 and 1064.6 nm. The output energy was the sum of the energy of the individually locked Nd:YAG lasers. The beam quality M2 of the combined beam is 2.8 x 2.2, which is nearly the same as that of a single Nd:YAG laser beam. This work should be helpful to provide an effective dual-wavelength laser source for applications. (c) 2023 Optica Publishing Group
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| GB/T 7714 | Zhu, Zhanda , Wu, Weichong , Wang, Luda et al. Dual-wavelength laser source by spectral beam combining of two Nd:YAG pulse lasers [J]. | APPLIED OPTICS , 2023 , 62 (8) : 1939-1942 . |
| MLA | Zhu, Zhanda et al. "Dual-wavelength laser source by spectral beam combining of two Nd:YAG pulse lasers" . | APPLIED OPTICS 62 . 8 (2023) : 1939-1942 . |
| APA | Zhu, Zhanda , Wu, Weichong , Wang, Luda , Hui, Yongling , Lei, Hong , Li, Qiang . Dual-wavelength laser source by spectral beam combining of two Nd:YAG pulse lasers . | APPLIED OPTICS , 2023 , 62 (8) , 1939-1942 . |
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Abstract ：
High slope efficiency 3 mu m laser output exceeding Stokes limit is demonstrated in Er:YAG crystals with lower doping concentration at room temperature. Based on cyclic cascaded cavity, several parameters affecting slope efficiency are optimized. Under the optimized configuration, slope efficiencies up to 36.5% and 37.2%, exceeding the Stokes efficiency of 33%, are achieved in 10at.% and 25at.% Er:YAG crystals, respectively. The realization of high slope efficiency paves the way for improving the average power of 3 mu m lasers.
Keyword ：
Er Er Cyclic cascade Cyclic cascade YAG crystals YAG crystals Mid -infrared lasers Mid -infrared lasers
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| GB/T 7714 | Wang, Sibo , Tian, Ye , Qu, Bo et al. High slope efficiency 3?m Er:YAG cyclic cascade pulsed lasers [J]. | OPTICS AND LASER TECHNOLOGY , 2023 , 158 . |
| MLA | Wang, Sibo et al. "High slope efficiency 3?m Er:YAG cyclic cascade pulsed lasers" . | OPTICS AND LASER TECHNOLOGY 158 (2023) . |
| APA | Wang, Sibo , Tian, Ye , Qu, Bo , Zhu, Zhanda , Hui, Yongling , Lei, Hong et al. High slope efficiency 3?m Er:YAG cyclic cascade pulsed lasers . | OPTICS AND LASER TECHNOLOGY , 2023 , 158 . |
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Abstract ：
The nonlinear transmission curves of the Co2+ : MgAl2O4 crystal at 1.5 mu m are experimentally measured by the pump-probe technique. The measurement results demonstrate that the transition into the near-infrared absorption band is polarized not only along the C-3 local symmetry axis, but also along the direction perpendicular to the C-3 axis, arising from the distortion of oxygen tetrahedrons about the Co2+ ions along the four C-3 local symmetry axes. The obtained saturation curves are analyzed using a theoretical model taking into account the transition of Co2+ ions along two orthogonal directions. The ground-state absorption cross sections for polarization parallel and perpendicular to the C-3 axis are calculated to be 3.4 x 10(-19) cm(2) and 2.6 x 10(-20) cm(2), respectively. The excited-state absorption cross section for polarization parallel to the C-3 axis is estimated to be 4.2 x 10(-20) cm(2). (C) 2022 Optica Publishing Group
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| GB/T 7714 | Wang, Yu , Wu, Weichong , Zhu, Zhanda et al. Measurement of absorption cross sections of Co2+: MgAl2O4 crystals with transition of Co2+ ions along two orthogonal directions [J]. | APPLIED OPTICS , 2022 , 61 (8) : 1918-1923 . |
| MLA | Wang, Yu et al. "Measurement of absorption cross sections of Co2+: MgAl2O4 crystals with transition of Co2+ ions along two orthogonal directions" . | APPLIED OPTICS 61 . 8 (2022) : 1918-1923 . |
| APA | Wang, Yu , Wu, Weichong , Zhu, Zhanda , Hui, Yongling , Lei, Hong , Li, Qiang . Measurement of absorption cross sections of Co2+: MgAl2O4 crystals with transition of Co2+ ions along two orthogonal directions . | APPLIED OPTICS , 2022 , 61 (8) , 1918-1923 . |
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Abstract ：
The performance of a novel, to the best of our knowledge, high-power Yb:YAG planar waveguide amplifier under thermal steady-state is studied numerically. We present a 3D thermal steady-state amplification model, which considers the effects of temperature on the Boltzmann occupation factors, pump absorption, and laser emission cross sections, in addition to reabsorption and pump saturation of Yb:YAG. The performance of a multipass-pumped planar waveguide amplifier under thermal steady-state was simulated considering the loss in the claddings, and a comparison with the simulated results under the ideal state was carried out. Our analysis results show that the core's temperature rise and the claddings' pump absorption lead to decreased pump absorption and optical-optical efficiencies. However, a high pump absorption efficiency (96%) and optical-optical efficiency (61.2%) are achieved when the pump power is 10 kW. Meanwhile, a lower fracture and minor thermal distortion can be expected in reality. (C) 2022 Optica Publishing Group
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| GB/T 7714 | Qu, Bo , Wang, Sibo , Zhu, Zhanda et al. Modeling of a high-power continuous wave Yb:YAG planar waveguide amplifier under thermal steady-state [J]. | APPLIED OPTICS , 2022 , 61 (9) : 2247-2255 . |
| MLA | Qu, Bo et al. "Modeling of a high-power continuous wave Yb:YAG planar waveguide amplifier under thermal steady-state" . | APPLIED OPTICS 61 . 9 (2022) : 2247-2255 . |
| APA | Qu, Bo , Wang, Sibo , Zhu, Zhanda , Hui, Yongling , Lei, Hong , Li, Qiang . Modeling of a high-power continuous wave Yb:YAG planar waveguide amplifier under thermal steady-state . | APPLIED OPTICS , 2022 , 61 (9) , 2247-2255 . |
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Abstract ：
We demonstrate a wavelength switchable high-power passively mode-locked laser based on a large size rectangular core crystalline waveguide and a semiconductor saturable absorption mirror. The wavelength switching is realized by controlling the polarization direction, the 1030 nm or 1050 nm mode-locked pulses are obtained. For 1030 nm single-wavelength configuration, an average power of 16.8-W with 2-ps pulse duration is achieved. For 1050 nm single-wavelength configuration, we obtained 15-W of average output power in pulses with 2.7-ps duration. This work proves that, in the large size rectangular core crystalline waveguide, the gain of 1030 nm laser is different for different polarization states, and the wavelength switching is realized.
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| GB/T 7714 | Li, Guotai , Li, Shuai , Zhang, Kailun et al. Experimental study of wavelength switchable Yb:YAG large size rectangular core crystalline waveguide mode-locking laser [J]. | APPLIED PHYSICS B-LASERS AND OPTICS , 2022 , 128 (6) . |
| MLA | Li, Guotai et al. "Experimental study of wavelength switchable Yb:YAG large size rectangular core crystalline waveguide mode-locking laser" . | APPLIED PHYSICS B-LASERS AND OPTICS 128 . 6 (2022) . |
| APA | Li, Guotai , Li, Shuai , Zhang, Kailun , Zhu, Zhanda , Hui, Yongling , Lei, Hong et al. Experimental study of wavelength switchable Yb:YAG large size rectangular core crystalline waveguide mode-locking laser . | APPLIED PHYSICS B-LASERS AND OPTICS , 2022 , 128 (6) . |
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Abstract ：
ABSTR A C T A novel diffusion double-ended bonded structure (DEBS) consisting of F2 glass, Er3+/Yb3+: glass and Co2+:MgAl2O4 was reported, for human eye-safety micro-ranging lasers. Compared with single-ended bonding structure (SEBS) and single glass structure (SGS) by the thermal analysis, its thermal focal length increased by 53.8% over the latter two. It was noted that the DEBS could effectively reduce the thermal effect of the gain medium. Under the identical experimental conditions, the DEBS's laser performance characteristics were significantly better than the other two. The peak power and laser stability of the DEBS could be dramatically improved more 45.4% and 100%, respectively. Finally, the DEBS laser delivered 340 mu J pulse energy with 10 Hz repetition rate, 5.5 ns pulse duration and 1.4 of beam quality factors M-2. Such an eye-safe compact laser can be applied in ranging systems, such as drones and low-altitude missiles.
Keyword ：
Laser ranging Laser ranging Eye-safe Eye-safe Micro laser Micro laser Double-ended bonded structure Double-ended bonded structure
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| GB/T 7714 | Ban, Xiaona , Hui, Yongling , Lv, Chong et al. Double-ended bonded F2 glass/ Er3+, Yb3+: glass/ Co2+:MgAl2O4 passive Q-switched micro laser [J]. | OPTICS COMMUNICATIONS , 2022 , 502 . |
| MLA | Ban, Xiaona et al. "Double-ended bonded F2 glass/ Er3+, Yb3+: glass/ Co2+:MgAl2O4 passive Q-switched micro laser" . | OPTICS COMMUNICATIONS 502 (2022) . |
| APA | Ban, Xiaona , Hui, Yongling , Lv, Chong , Lei, Hong , Li, Qiang , Wang, Zhao et al. Double-ended bonded F2 glass/ Er3+, Yb3+: glass/ Co2+:MgAl2O4 passive Q-switched micro laser . | OPTICS COMMUNICATIONS , 2022 , 502 . |
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Abstract ：
Objective Laser diode (LD)-pumped neodymium-doped yttrium aluminum garnet (Nd: YAG) Q-switched laser has the advantages of small volume, lightweight, long service life, and high conversion efficiency. It is widely used in material processing, lidar, and laser ranging. Recently, the development of laser technology has necessitated an increase in the efficiency and output energy of Nd: YAG Q-switched laser. Presently, the output optical-to-optical conversion efficiency of LD-pumped Nd: YAG electro-optical Q-switched laser has been maintained at ~20%. Improving the optical-to-optical conversion efficiency of the laser can effectively reduce the volume and weight of the laser under the same energy output conditions. Various approaches to improve the optical-to-optical conversion efficiency have been reported. One way is to enhance the pump energy absorption. Another way is to reduce energy loss by suppressing amplified spontaneous emission (ASE) and parasitic oscillation to enhance the output optical-to-optical conversion efficiency of Q-switched laser. In this study, we propose a high-efficiency LD corner-side-pumped Nd: YAG electro-optical Q-switched laser using a composite slab laser crystal. By improving the pump light absorption efficiency and suppressing ASE, we improve the output optical-to-optical conversion efficiency of the Nd: YAG electro-optical Q-switched laser. We hope that our research can be helpful in improving the output energy and efficiency of Q-switched solid-state lasers. Methods This study is based on a composite slab laser crystal. First, the gain medium is a Nd: YAG crystal with atomic fraction of 0.1% and cross section size of 4 mm×4 mm. Four pieces of Sm: YAG crystals with atomic fraction of 3% and thickness of 1 mm are thermally bonded around the side surfaces of the Nd: YAG crystal to inhibit ASE and parasitic oscillation. Next, undoped YAG bulk crystals are sequentially bonded to the Sm: YAG crystal. Then, we determin the size of the composite slab laser crystal. Note that using an improved corner-side hybrid pump structure achieves a high absorption efficiency for the pump light by crossing through the active media Nd: YAG 13 times. Next, from the ray-tracing method, we analyse the absorption efficiency and pump uniformity of the pump light using the non-sequential mode of ZEMAX simulation software. The electro-optical Q-switched system is used to study the output of the Q-switching experiment. Furthermore, the variation between free output and Q-switched output energy versus input current is studied. The optical-to-optical conversion efficiency of Q-switched output at different input currents and the dynamic-to-static ratio at the highest output efficiency are calculated. Finally, the pulse width, beam quality, and far-field spot of the laser are measured. Results and Discussions The free-running and Q-switched pulse outputs of the laser are measured when the pump pulse width is 230 μs and the repetition rate is 5 Hz. When the pump current is 180 A, the laser operates freely and obtains the maximum output single pulse energy of 124 mJ. With the increase in pump current, the output optical-to-optical conversion efficiency of the Q-switched pulse laser increases and then decreases. At the pump current of 170 A, we obtain the highest optical-to-optical efficiency which is 30.1%. Furthermore, the dynamic-to-static ratio is as high as 94. 64% (Fig. 4). We detect the Q-switched pulse waveform using a photodetector at an output energy of 106 mj and the detected pulse width is 15 ns [Fig. 5 (a) ]. Additionally, we use a wedge prism to sample the output laser beam with repetition rate of 5 Hz and a single pulse energy of 106 mJ, and the output beam is focused by a lens with a focal length of 150 mm. Also, a charge-coupled device beam analyzer is used to measure the beam quality factor. After the measurement, the beam quality factors of M2X = 4.43 and M2y=4.79 are obtained [Fig. 5 (b) ]. Conclusions In this paper, we investigate and experimentally design an LD corner-side-pumped Nd: YAG electro-optical Q-switched laser, and we realize a high-efficiency 1064 nm pulse laser output. The use of a novel corner-side hybrid pump structure gives high absorption efficiency of pump light. Furthermore, four pieces of Sm: YAG crystals are bounded around the active medium Nd: YAG to suppress parasitic oscillation and effectively reduce ASE. Finally, we obtain a single pulse energy of 106 mJ and pulse width of 15 ns in the Q-switching mode under conditions of a pulse repetition rate of 5 Hz and a pump width of 230 μs. Also, the optical-to-optical conversion efficiency is 30.1% and the dynamic-to-static ratio is 94.64%. The experimental results show that the composite slab laser crystal structure realizes high-efficiency absorption of pump light and effectively suppresses ASE and parasitic oscillation. Thus, our proposed method provides an effective method for high-efficiency 1064 nm Q-switched pulse laser output. © 2022 Science Press. All rights reserved.
Keyword ：
amplified spontaneous radiation amplified spontaneous radiation lasers lasers electro-optical Q-switching electro-optical Q-switching Nd:YAG Nd:YAG
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| GB/T 7714 | Lv, S. , Zhu, Z. , Liu, D. et al. High-Efficiency LD Corner-Side-Pumped Nd∶YAG Electro-Optical Q-Switched Laser [高效率LD角侧泵浦Nd∶YAG电光调Q激光器] [J]. | Chinese Journal of Lasers , 2022 , 49 (17) . |
| MLA | Lv, S. et al. "High-Efficiency LD Corner-Side-Pumped Nd∶YAG Electro-Optical Q-Switched Laser [高效率LD角侧泵浦Nd∶YAG电光调Q激光器]" . | Chinese Journal of Lasers 49 . 17 (2022) . |
| APA | Lv, S. , Zhu, Z. , Liu, D. , Hui, Y. , Lei, H. , Li, Q. . High-Efficiency LD Corner-Side-Pumped Nd∶YAG Electro-Optical Q-Switched Laser [高效率LD角侧泵浦Nd∶YAG电光调Q激光器] . | Chinese Journal of Lasers , 2022 , 49 (17) . |
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Abstract ：
Large core diameter crystal waveguides can absorb higher power pump light and achieve higher output power. At the same time, the peak power density in the core layer is relatively low during mode-locking operation, and the accumulation of nonlinear effects is reduced. Based on this, a passively mode-locked picosecond laser based on Yb: YAG large core diameter crystal square waveguide is constructed. In the experiment, firstly, the high mirror is used instead of the semiconductor saturable absorption mirror (SESAM), and the position and angle of the crystal waveguide are adjusted to match the pump light with the waveguide core layer under higher pump power. Then, the angle of the spherical mirror is carefully adjusted to couple the signal light into the waveguide core layer to minimize the loss in the cavity. The designed laser adopts a folded cavity structure, and achieves an average power of 10.2 W, pulse width of 65 ps, repetition rate of 30.15 MHz, and single pulse energy of 0.34 mu J without dispersion compensation device.
Keyword ：
crystal waveguide crystal waveguide lasers lasers semiconductor saturable absorption mirror semiconductor saturable absorption mirror mode locked laser mode locked laser solid-state laser solid-state laser
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| GB/T 7714 | Li Shuai , Li Guotai , Zhang Kailun et al. Semiconductor Saturable Absorption Mirror Mode-Locked Laser Based on Large Core Size Crystal Waveguide [J]. | ACTA OPTICA SINICA , 2022 , 42 (10) . |
| MLA | Li Shuai et al. "Semiconductor Saturable Absorption Mirror Mode-Locked Laser Based on Large Core Size Crystal Waveguide" . | ACTA OPTICA SINICA 42 . 10 (2022) . |
| APA | Li Shuai , Li Guotai , Zhang Kailun , Zhu Zhanda , Hui Yongling , Lei Hong et al. Semiconductor Saturable Absorption Mirror Mode-Locked Laser Based on Large Core Size Crystal Waveguide . | ACTA OPTICA SINICA , 2022 , 42 (10) . |
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Abstract ：
Determining the orientation of electric dipoles in Q-switched crystals with anisotropic and nonlinear absorption properties is an important condition for measuring their absorption cross sections. Through the analysis of the space group to which the Co2+:MgAl2O4 crystal belongs and the position symmetry of the doped Co2+ in the cell structure, it is determined that the transition direction of the electric dipole in the crystal is mainly distributed along the diagonal direction of four individuals in the cell, and the theoretical model of polarized incident light propagation in the Co2+:MgAl2O4 crystal is established. The nonlinear transmittance curve of Co2+:MgAl2O4 crystal cut along [100] direction is measured experimentally in the direction of polarized incident light. The experimental results are fitted by the established model. The ground state absorption cross section and excited state absorption cross section of Co2+:MgAl2O4 crystal in 1.5 mu m wave band are (3.6 +/- 0.3) x 10(-19) cm(2) and (4. 5 +/- 0.4) x 10(-20) cm(2), respectively.
Keyword ：
Co2+:MgAl2O4 Co2+:MgAl2O4 laser optics laser optics absorption cross-section absorption cross-section anisotropy anisotropy saturable absorption saturable absorption passive Q-switching passive Q-switching
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| GB/T 7714 | Wang Yu , Wu Weichong , Zhu Zhanda et al. Measurement of Co2+:MgAl2O4 Absorption Cross-Sections by Determining Dipole Orientation [J]. | ACTA OPTICA SINICA , 2022 , 42 (10) . |
| MLA | Wang Yu et al. "Measurement of Co2+:MgAl2O4 Absorption Cross-Sections by Determining Dipole Orientation" . | ACTA OPTICA SINICA 42 . 10 (2022) . |
| APA | Wang Yu , Wu Weichong , Zhu Zhanda , Hui Yongling , Lei Hong , Li Qiang . Measurement of Co2+:MgAl2O4 Absorption Cross-Sections by Determining Dipole Orientation . | ACTA OPTICA SINICA , 2022 , 42 (10) . |
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Abstract ：
We demonstrate a high-power all-solid-state picosecond laser based on a passive mode-locking laser with a large-size rectangular core crystalline waveguide and a semiconductor saturable-absorber mirror. An average power of 16.9 W is achieved with a 1.96 ps duration and a 31.74 MHz repetition frequency. This is the first demonstration of a mode-locked laser with a large-size rectangular core crystalline waveguide to our knowledge. (C) 2022 Optica Publishing Group
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| GB/T 7714 | Li, Guotai , Li, Shuai , Zhang, Kailun et al. 16.9 W average power from a diode-pumped picosecond Yb:YAG laser with a large-size rectangular core crystalline waveguide [J]. | OPTICS LETTERS , 2022 , 47 (4) : 878-881 . |
| MLA | Li, Guotai et al. "16.9 W average power from a diode-pumped picosecond Yb:YAG laser with a large-size rectangular core crystalline waveguide" . | OPTICS LETTERS 47 . 4 (2022) : 878-881 . |
| APA | Li, Guotai , Li, Shuai , Zhang, Kailun , Zhu, Zhanda , Hui, Yongling , Lei, Hong et al. 16.9 W average power from a diode-pumped picosecond Yb:YAG laser with a large-size rectangular core crystalline waveguide . | OPTICS LETTERS , 2022 , 47 (4) , 878-881 . |
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