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Composition-Dependent Optical, Dielectric and D-Orbital Electron Characteristic of High-Throughput Horizontal Composition Gradient Li1-Xmgxti2o4 Combinatorial Film

SSRN

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SSRN 2024年

作者： Wang, Yueming Li, Yongfu Wei, Mingyang Jin, Kui Li, Qian Zhang, Ding Zhou, Xiang'an Han, Yating Lian, Jie School of Information Science and Engineering Shandong Provincial Key Laboratory of Laser Technology and Application Shandong University Qingdao266237 China Center for Optics Research and Engineering Key Laboratory of Laser & Infrared System Ministry of Education Shandong University Qingdao266237 China National Lab for Superconductivity Institute of Physics Chinese Academy of Sciences Beijing100190 China State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics Tsinghua University Beijing100084 China

The unique physical properties of LiTi2O4 and MgTi2O4 have attracted extensive research interest in various fields, including new type batteries and high-temperature superconductors. However, the intricate mechanism governing the d-orbital electron within this system still awaits further excavation. Herein, we employed the combinatorial laser molecular beam epitaxy technique to fabricate a high-quality composition-spread Li1-xMgxTi2O4 film and evaluated its structure, composition, surface morphology and phonon modes by X-ray diffraction, X-ray photoelectron spectroscopy, atomic force microscopy, and Raman scattering spectroscopy. The optical constants and dielectric properties of diverse microregions with varying Li/Mg content over a wide spectral range (189-1658 nm) were measured nondestructively using the ellipsometer, revealing the composition-dependent optical properties of Li1-xMgxTi2O4. By fitting the second derivative spectra (d2Ε/dE2) using the standard critical point model, five transitions within the detected spectral range were observed. Combining previous analyses and first-principles calculation, we attribute the critical points to crystal field (CF) transition 4A2 →4T1 originating from the spin state of tetrahedral Li/Mg ions, the binding of Ti-related pairs and electron transitions between O-2p to Ti-3d orbits. This exploration of the precise structure of the d-metal band provides a positive reference for the regulation and application of relevant devices. © 2024, The Authors. All rights reserved.

关键词： Lithium compounds

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A high-efficiency 240 W-level thin-rod Yb:YAG amplifier with dual-wavelength pumping method

A high-efficiency 240 W-level thin-rod Yb:YAG amplifier with...

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Conference on lasers and Electro-Optics (CLEO)

作者： Shang Wang Zhaojun Liu Zhenhua Cong Xingyu Zhang Zhigang Zhao Key Laboratory of Laser & Infrared System Ministry of Education Shandong University Qingdao China School of Information Science and Engineering Shandong University Qingdao China Shandong Provincial Key Laboratory of Laser Technology and Application Shandong University Qingdao China

A high-efficiency 240 W-level ultrashort pulse laser amplifier based on thin-rod Yb:YAG was obtained by adopting a dual-wavelength (940 nm and 969 nm) pumping method, along with a power extraction efficiency of ~51%.

ISBN: (数字)9781957171050

ISBN: (纸本)9781665466660

关键词： Power lasers lasers and electrooptics laser excitation Optical pulse generation Electrooptical waveguides Pump lasers

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Normal Dispersion Fiber-based Nonlinear Pulse Compressor for Generating 2-μm Watt-scale, ~100-MHz, Few-cycle laser Pulse

Normal Dispersion Fiber-based Nonlinear Pulse Compressor for...

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Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Tianli Feng Jingcheng Shang Shengzhi Zhao Yizhou Liu Kejian Yang Chun Wang Tao Li School of Information Science and Engineering Shandong Provincial Key Laboratory of Laser Technology and Application China Key Laboratory of Laser & Infrared System (Ministry of Education) Shandong University Qingdao China Institute of Novel Semiconductors State Key Laboratory of Crystal Materials Shandong University Jinan China

We firstly perform the nonlinear pulse compression for a 2-μm, 101.4-MHz driving laser pulse by splicing normal dispersion fiber (NDF). With the assistance of dispersion compensation of chirped mirror pair, a 28.3-fs (4.2-cycle) compressed pulse, which is 16 times narrower than the 450-fs driving pulse, is realized. The output average power of >1 W creates a new record for the fiber-based nonlinear pulse compressors with such high pulse repetition in the short-mid infrared wavelength region.

关键词： Optical fibers Splicing Power lasers Optical pulse compression Optical fiber communication Compressors Ultrafast optics

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Study of Composition-Modulated Interband Transitions Characteristic and Charge Dynamics Response of High-Throughput FeSe1-xTex Combinatorial Film

SSRN

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SSRN 2024年

作者： Wang, Yueming Wei, Mingyang Li, Yongfu Jin, Kui Lin, Zefeng Zhou, Xiang'an Han, Yating Guan, Xiangyun Lian, Jie School of Information Science and Engineering Shandong Provincial Key Laboratory of Laser Technology and Application Shandong University Qingdao266237 China Center for Optics Research and Engineering Key Laboratory of Laser & Infrared System Ministry of Education Shandong University Qingdao266237 China National Lab for Superconductivity Institute of Physics Chinese Academy of Sciences Beijing100190 China Department of Basic Shandong Urban Construction Vocational College Jinan250100 China

FeSe is regarded as a strong correlation system of simple structure and remarkable tunability in the superconducting transition temperature (Tc). Particularly, the substitution of Se with its isoelectronic Te leads to a dome-shaped Tc evolution, positioning the FeSe1-xTex as an ideal platform for exploring the mechanism of iron-based superconductivity. In this study, we employed high-throughput combinatorial molecular beam epitaxy (CLMBE) to fabricate high-quality FeSe1-xTex film with horizontal gradient. The dielectric spectra of FeSe1-xTex were obtained by ellipsometry spectroscopy (SE). We utilized the standard critical point model and first-principles calculation to identify that the observed interband transitions are predominantly sourced from Fe-3d near the Fermi surface. The pseudogap, extracted from the transitions, shows a bowl-like trend as increased Te, which is negatively correlated with Tc, suggesting a qualitative way to predict Tc in the normal-state. The composition-dependent charge dynamics response, derived from Drude oscillators in SE, indicates that electron-electron interactions might play a more substantial role in FeSe1-xTex superconductivity, combined with the unidirectional electron-phonon coupling result in Raman. The variation of plasma frequency and photoinduced carrier dispersion under composition modulation demonstrates the effect of Te in enhancing system interactions, providing valuable support for the design of superconducting optoelectronic devices. © 2024, The Authors. All rights reserved.

关键词： Iron compounds

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Dissipative Soliton Resonance and Noise-Like Pulse in a Self-Pulsing Fiber laser

SSRN

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SSRN 2022年

作者： Ma, Xiaoran Feng, Tianli Zhao, Shengzhi Liu, Yizhou Wang, Chun Shang, Jingcheng Hu, Ping Mao, Jiajia Yang, Kejian Li, Tao China Key Laboratory of Laser & Infrared System Ministry of Education Shandong Provincial Key Laboratory of Laser Technology and Application School of Information Science and Engineering Shandong University Qingdao266237 China Institute of Novel Semiconductors State Key Laboratory of Crystal Materials Shandong University Jinan250100 China

In this paper, a self-pulsing Er-doped fiber laser operating in the dissipative soliton resonance (DSR) regime is firstly reported. By adjusting the pumping power and intracavity pulse polarization, the generated mode-locking pulse could evolve between soliton pulse, dissipative soliton resonance pulse and noise-like pulse (NLP). In the dissipative soliton resonance mode-locking regime, the generated rectangular-shaped pulses centered at 1570.5 nm with a maximum average output power of 20.6 mW and a pulse duration of 8.9 ns. The self-pulsing evolving dynamics can be analyzed using weak NPR effect by simultaneously considering the polarization dependent loss from the polarization controller and the reabsorption loss of the un-pumped gain fiber. © 2022, The Authors. All rights reserved.

关键词： Fiber lasers

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Density-wave-like gap evolution in La3Ni2O7 under high pressure revealed by ultrafast optical spectroscopy

arXiv

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arXiv 2024年

作者： Meng, Yanghao Yang, Yi Sun, Hualei Zhang, Sasa Luo, Jianlin Chen, Liucheng Ma, Xiaoli Wang, Meng Hong, Fang Wang, Xinbo Yu, Xiaohui Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing100190 China Key Laboratory of Education Ministry Laser and Infrared System Integration Technology Shandong University Qingdao266237 China School of Science Sun Yat-sen University Shenzhen518107 China School of Information Science and Engineering Shandong University Qingdao266237 China Songshan Lake Materials Laboratory Guangdong Dongguan523808 China Center for Neutron Science and Technology Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices School of Physics Sun Yat-Sen University Guangzhou China

Density wave (DW) order is believed to be correlated with superconductivity in the recently discovered high-temperature superconductor La3Ni2O7. However, experimental investigations of its evolution under high pressure are still lacking. Here, we explore the quasiparticle dynamics in bilayer nickelate La3Ni2O7 single crystals using ultrafast optical pump-probe spectroscopy under high pressures up to 34.2 GPa. At ambient pressure, the temperature-dependent relaxation dynamics demonstrate a phonon bottleneck effect due to the opening of an energy gap around 151 K. The energy scale of the DW-like gap is determined to be 66 meV by the Rothwarf-Taylor model. Combined with recent experiential results, we propose that this DW-like transition at ambient pressure and low temperature is spin density wave (SDW). With increasing pressure, this SDW order is significantly suppressed up to 13.3 GPa before it completely disappears around 26 GPa. Remarkably, at pressures above 29.4 GPa, we observe the emergence of another DW-like order with a transition temperature of approximately 135 K, which is probably related to the predicted charge density wave (CDW) order. Our study provides the experimental evidence of the evolution of the DW-like gap under high pressure, offering critical insights into the correlation between DW order and superconductivity in La3Ni2O7. Copyright © 2024, The Authors. All rights reserved.

关键词： High temperature superconductors

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Glass Forming Region and Er3+ 2.7 Μm Emission Properties of Al2o3-Cao-Sro infrared Glass

SSRN

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SSRN 2024年

作者： Liu, Yin Wan, Jie Xiao, Yongbao Yu, Dechao College of Metallurgy and Materials Engineering Chongqing University of Science and Technology Chongqing401331 China Laboratory of Infrared Materials and Devices Advanced Technology Research Institute Ningbo University Ningbo315211 China State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques Institute of Optical Communication Materials South China University of Technology Guangzhou510641 China College of Materials Science and Engineering Chongqing University Chongqing400045 China Engineering Research Center of Optical Instrument and System Ministry of Education Shanghai Key Lab of Modern Optical System University of Shanghai for Science and Technology Shanghai200093 China

Glass forming regions of Al2O3-CaO-SrO (AlCaSr) system were systematically studied and clearly depicted by a combination of thermodynamic calculation method and traditional melt-quenching experiments. The glass forming region was first found with a composition range of Al2O3: 12-32 mol%, CaO: 43-68 mol%, and SrO: 20-36 mol%. Moreover, two representative glass compositions, 26.6Al2O3-49.4CaO-24SrO (AlCaSr-1) and 17.48Al2O3-58.52CaO-24SrO (AlCaSr-2), in central part of the experimental glass forming region and the corresponding glass doped with 1 mol% Er2O3, i.e., AlCaSr-1-Er and AlCaSr-2-Er, were selected and carefully prepared in our lab. Detailed investigations proved that the AlCaSr glasses had excellent comprehensive properties with high Tg temperature (~ 800 °C), wide transparency wavelength range (0.3-6 μm), and low maximum phonon energy (~ 770 cm-1), and good 2.7 μm mid-infrared emitting properties via doping Er3+ activators. These results highlight the potential application of AlCaSr glasses as infrared materials, and could benefit the development of high-performance infrared glasses. © 2024, The Authors. All rights reserved.

关键词： Aluminum oxide

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High repetition rate, tunable mid-infrared vortex beam generation based on ZGP optical parametric oscillator

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Optics Communications 2025年 589卷

作者： Meng, Jun Wang, Fei Liu, Gaoyou Liu, Zhaojun School of Information Science and Engineering and Key Laboratory of Laser and Infrared System of Ministry of Education Shandong University Qingdao266237 China Shandong Provincial Key Laboratory of Laser Technology and Application Qingdao266237 China

We present a tunable, high-repetition-rate mid-infrared vortex laser based on ZnGeP2 (ZGP) optical parametric oscillator (OPO) with a singly resonant plane-parallel cavity which was pumped by a 2.1 μm vortex laser. The signal wavelength was tunable from 3.4 to 4.1 μm by rotating the ZGP crystal, while the corresponding idler output ranged from 4.2 to 5.3 μm. The signal vortex beam retained the same topological charge as the pump, while the idler beam exhibited a Gaussian intensity profile. At pulse repetition frequency of 10 kHz, the system achieved maximum output powers of 6.5 W for the signal (3.89 μm) and 5 W for the idler (4.55 μm), with pulse widths of 60.3 ns and 54.8 ns, respectively. This work demonstrates a highly efficient and flexible approach to generating vortex beams in the mid-infrared, advancing the potential for applications in high-resolution imaging, spectroscopy, and nonlinear optics. © 2025

关键词： Optical parametric oscillators

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Watt-Level Diode-Pumped Tm:CALGO laser at 2.31 µm

Watt-Level Diode-Pumped Tm:CALGO Laser at 2.31 µm

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Conference on lasers and Electro-Optics (CLEO)

作者： Xiaoxu Yu Zhongben Pan Kirill Eremeev Pavel Loiko Hongwei Chu Han Pan Alain Braud Patrice Camy Luidgi Giordano Bruno Viana Uwe Griebner Valentin Petrov Dechun Li Key Laboratory of Laser and Infrared System Integration Technology Ministry of Education School of Information Science and Engineering Shandong University Qingdao China Centre de Recherche sur les Ions les Matériaux et la Photonique (CIMAP) UMR 6252 CEA-CNRS-ENSICAEN Université de Caen Caen Cedex 4 France Chimie ParisTech PSL University CNRS Institut de Recherche de Chimie Paris Paris France Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy Berlin Germany

A diode-pumped continuous-wave 1.5 at.% Tm:CALGO laser operating on the 3 H 4 → 3 H 5 transition generated 1.44 W at 2284-2348 nm with a linear laser polarization (σ). The relevant spectroscopic properties of this... 详细信息

ISBN: (纸本)9798350369311

关键词： Semiconductor lasers lasers and electrooptics laser transitions Electro-optical waveguides

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Passively Mode-Locked Ho-Doped Fiber laser with Soliton Rain and Noise-Like Pulse Regime

SSRN

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SSRN 2022年

作者： Hu, Ping Mao, Jiajia Zhou, Xue Feng, Tianli Nie, Hongkun Wang, Ruihua Zhang, Baitao Li, Tao He, Jingliang Yang, Kejian Institute of Novel Semiconductors State Key Laboratory of Crystal Materials Shandong University Jinan250100 China China Key Laboratory of Laser & Infrared System Ministry of Education Shandong Provincial Key Laboratory of Laser Technology and Application School of Information Science and Engineering Shandong University Qingdao266237 China School of Shenzhen Research Institute Shandong University Shenzhen518057 China School of State Key Laboratory of Quantum Optics and Quantum Optics Devices Shanxi University Taiyuan030006 China School of Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal University Jinan250358 China

A passively Ho-doped fiber laser at 2 μm with soliton rain and noise-like pulse (NLP) operation regime has been realized by using nonlinear polarization rotation (NPR) technology. By adjusting the polarization state, the evolution phenomenon of soliton rain pulse and the NLP are obtained. The typical NLP mode-locking operation regime is achieved by finely adjusting pump power and polarization state, which delivers a corresponding pulse energy of 8.93 nJ with pulse width of 1.31 ps. The soliton rain operation regime with multiple solitons is achieved by finely adjusting pump power, which delivers a corresponding pulse energy of 22.98 nJ with pulse width of 1.21 ps. In addition, a NLP mode-locking operation regime is obtained again under a proper pump power and polarization state with a corresponding pulse energy of 34.14 nJ and pulse width of 1.208 ps. The experimental results well demonstrate the evolution of ultrashort pulse regime with the pump power and polarization state in passively mode-locked Ho-doped fiber lasers at 2 μm. © 2022, The Authors. All rights reserved.

关键词： Fiber lasers

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