Author Affiliations
Abstract
College of Electronics and Information Engineering, Sichuan University, Chengdu, China
Nonlinear compression has become an obligatory technique along with the development of ultrafast lasers in generating ultrashort pulses with narrow pulse widths and high peak power. In particular, techniques of nonlinear compression have experienced a rapid progress as ytterbium (Yb)-doped lasers with pulse widths in the range from hundreds of femtoseconds to a few picoseconds have become mainstream laser tools for both scientific and industrial applications. Here, we report a simple and stable nonlinear pulse compression technique with high efficiency through cascaded filamentation in air followed by dispersion compensation. Pulses at a center wavelength of 1040 nm with millijoule pulse energy and 160 fs pulse width from a high-power Yb:CaAlGdO4 regenerative amplifier are compressed to 32 fs, with only 2.4% loss from the filamentation process. The compressed pulse has a stable output power with a root-mean-square variation of 0.2% over 1 hour.
femtosecond pulse filamentation nonlinear compression 
High Power Laser Science and Engineering
2023, 11(6): 06000e84
Author Affiliations
Abstract
1 College of Electronics and Information Engineering, Sichuan University, Chengdu, Sichuan 610064, China.
2 Key Laboratory of High Energy Density Physics and Technology (MoE), College of Physics, Sichuan University, Chengdu 610064, China.
3 College of Physics, Key Laboratory of High Energy Density Physics and Technology of the Ministry of Education, Sichuan University, Chengdu, Sichuan 610064, China.
Mid-infrared (MIR) ultra-short pulses with multiple spectral-band coverage and good freedom in spectral and temporal shaping are desired by broad applications such as steering strong-field ionization, investigating bound-electron dynamics, and minimally invasive tissue ablation. However, the existing methods of light transient generation lack freedom in spectral tuning and require sophisticated apparatus for complicated phase and noise control. Here, with both numerical analysis and experimental demonstration, we report the first attempt, to the best our knowledge, at generating MIR pulses with dual-wavelength spectral shaping and exceptional freedom of tunability in both the lasing wavelength and relative spectral amplitudes, based on a relatively simple and compact apparatus compared to traditional pulse synthesizers. The proof-of-concept demonstration in steering the high-harmonic generation in a polycrystalline ZnSe plate is facilitated by dual-wavelength MIR pulses shaped in both spectral and temporal domains, spanning from 5.6 to 11.4 μm, with multi-microjoule pulse energy and hundred- milliwatt average power. Multisets of harmonics corresponding to different fundamental wavelengths are simultaneously generated in the deep ultraviolet region, and both the relative strength of individual harmonics sets and the spectral shapes of harmonics are harnessed with remarkable freedom and flexibility. This work would open new possibilities in exploring femtosecond control of electron dynamics and light–matter interaction in composite molecular systems.
Ultrafast Science
2023, 3(1): 0022
Han Wu 1†Weizhe Wang 1†Bo Hu 1Yang Li 1[ ... ]Houkun Liang 1,6,*
Author Affiliations
Abstract
1 College of Electronics and Information Engineering, Sichuan University, Chengdu 610064, China
2 International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, China
3 Beijing Center for Crystal Research and Development, Key Laboratory of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
4 e-mail: liu-jun-1987@live.cn
5 e-mail: jyao@mail.ipc.ac.cn
6 e-mail: hkliang@scu.edu.cn
Nonlinear frequency conversion of wavelength agile and high-power random fiber lasers can provide a promising way to generate continuous-wave (CW) visible and mid-infrared (MIR) light with unique properties such as the continuous modeless spectrum, low temporal/spatial coherence, and high temporal stability. Here, we report a dual-wavelength switchable and tunable random Raman fiber laser (RRFL) based on a phosphosilicate fiber that has two Raman gain peaks for the first time and demonstrate its superior capability to generate widely tunable CW visible and mid-infrared light via nonlinear frequency conversions. By using the combination of a tunable pump and two tunable gratings in Littrow configuration that can provide separated point feedback for the two Stokes wavelengths corresponding to silica- and phosphorus-related Raman peaks, the spectrum of an RRFL can be flexibly manipulated for the aim of nonlinear frequency conversions, including single-wavelength tunable emission at the 1.1 μm or 1.2 μm band for second-harmonic generation (SHG), dual-wavelength simultaneously tunable emission at the 1.1 μm and 1.2 μm bands for the sum-frequency generation (SFG), and dual-wavelength separation tunable emission for difference-frequency generation (DFG). As a result, with the combination of SHG and SFG in a periodically poled lithium niobate crystal array, we experimentally demonstrate the broadest tuning range (560–630 nm) of visible light generated from an RRFL, to the best of our knowledge. The tunable MIR light in the range of 10.7–12.3 μm is also demonstrated through DFG of an RRFL operating in separation tunable dual-wavelength emission mode in a BaGa4Se7 (BGSe) crystal, which is the first realization of >10 μm CW DFG in the BGSe crystal. We believe the developed dual-wavelength switchable and tunable RRFL can provide a new compact, robust, and cost-effective platform to realize broadly tunable light in both the visible and MIR regions, which can also find potential applications in imaging, sensing, and temporal ghost imaging in various spectral bands.
Photonics Research
2023, 11(5): 808
作者单位
摘要
1 纳米清洁能源中心,燕山大学亚稳材料制备技术与科学国家重点实验室,河北 秦皇岛 066004
2 燕山大学亚稳材料制备技术与科学国家重点实验室,河北 秦皇岛 066004
采用溶液浇筑法结合热压法制备了复合固态电解质,将Na-β-Al2O3和g-C3N4无机颗粒加入到聚氧化乙烯和聚己内酯共混聚合物中得到复合电解质,结合物相表征和电化学测试研究了复合电解质性能。通过优化各组分特别是g-C3N4的质量比例,聚合物复合电解质获得了在室温下较高的离子电导率、宽的电化学稳定窗口以及较好的抑制钠枝晶能力。在50 ℃,由金属钠电极组装的对称电池在0.1 mA/cm2的电流密度可以长时间稳定循环;以Na3V2(PO4)3@C为正极活性材料,金属钠与碳纸复合作为负极组装全固态电池(不添加任何液体),在0.2 C充放电比容量稳定在约107 mA·h/g。
复合电解质 聚合物共混 氧化铝电解质 石墨相氮化碳 钠电池 composite polymer electrolyte polymer blending aluminium oxide electrolyte graphitic carbon nitride sodium battery 
硅酸盐学报
2022, 50(1): 47
作者单位
摘要
四川大学 电子信息学院,成都 610065
中红外激光具有多种优势,可以广泛地用到生物、化学、物理等科学研究领域。通常采用直接激射和非线性频率转换这两种方式产生中红外激光,然而,为了实现中红外宽带超短脉冲的发射,非线性频率下转换是现今的唯一方法。脉冲内差频(IP-DFG)是一种简单的非线性频率转换方法,文中对红外IP-DFG的工作做了详细的回顾,从中红外激光晶体和基于IP-DFG产生具有超宽带的中红外超短脉冲的先进工作两个方面做了综述和评论,分别比较了非线性晶体类型、驱动脉冲源、产生超宽带中红外脉冲的光谱范围、转化效率等,并在最后讨论和阐明了IP-DFG领域面临的机遇和挑战。
中红外激光 非线性频率转换 脉冲内差频 非线性晶体类型 驱动脉冲源 mid-infrared laser nonlinear frequency conversion intra-pulse difference frequency generation types of nonlinear crystal the driving pulse 
强激光与粒子束
2021, 33(11): 111004
Author Affiliations
Abstract
1 College of Electronics and Information Engineering, Sichuan University, Chengdu 610064, China
2 Beijing WaveQuanta Technology Co., Ltd., Beijing 102208, China
3 Hangzhou Yacto Technology Ltd., Hangzhou 311305, China
Lasers with high average and high peak power as well as ultrashort pulse width have been all along demanded by nonlinear optics studies, strong-field experiments, electron dynamics investigations, and ultrafast spectroscopy. While the routinely used titanium-doped sapphire (Ti:sapphire) laser faces a bottleneck in the average power upscaling, ytterbium (Yb)-doped lasers have remarkable advantages in achieving high average power. However, there is still a substantial gap of pulse width and peak power between the Ti:sapphire and Yb-doped lasers. Here we demonstrate a high-power Yb:CaAlGdO4 (Yb:CALGO) regenerative amplifier system, delivering 1040 nm pulses with 11 W average power, 50 fs pulse width, and 3.7 GW peak power at a repetition rate of 43 kHz, which to some extent bridges the gap between the Ti:sapphire and Yb lasers. An ultrabroadband Yb-doped fiber oscillator, specially designed spectral shapers, and Yb:CALGO gain medium with broad emission bandwidth, together with a double-end pumping scheme enable an amplified bandwidth of 19 nm and 95 fs output pulse width. To the best of our knowledge, this is the first demonstration of sub-100 fs regenerative amplifier based on Yb-doped bulk medium without nonlinear spectral broadening. The amplified pulse is further compressed to 50 fs via cascaded-quadratic compression with a simple setup, producing 3.7 GW peak power, which boosts the record of peak power from Yb:CALGO regenerative amplifiers by 1 order. As a proof of concept, pumped by the high-power, 50 fs pulses, 7.5–11.5 µm mid-infrared (MIR) generation via intrapulse difference-frequency generation is performed, without the necessity of nonlinear fiber compressors. It leads to a simple and robust apparatus, and it would find good usefulness in MIR spectroscopic applications.
Photonics Research
2021, 9(8): 08001439
郑雪 1江睿 1李谦 1王伟哲 1[ ... ]彭静 2
作者单位
摘要
1 华中科技大学 光学与电子信息学院, 武汉 430074
2 武汉科技大学 理学院, 武汉 430081
LED具有高效、节能和环保等优势, 广泛应用于照明领域, 提高LED的发光效率一直是该领域的研究难点与热点。为了降低GaN材料与空气界面的全反射现象, 提高光提取效率, 本研究探讨了类阳极氧化铝AAO(Anodic aluminum oxide)纳米结构LED器件的制备和性能。通过电感耦合等离子体(Inductively coupled plasma, ICP)刻蚀工艺的调控, 在p-GaN层表面制备了大面积有序孔洞纳米结构阵列, 可获得孔径250~500 nm, 孔深50~150 nm的准光子晶体结构, 从而大幅提高了LED的发光强度, 其中孔径400 nm、深度150 nm的纳米阵列LED相比于没有纳米阵列的LED发光强度提高达3.5倍。
电感耦合等离子体(ICP)刻蚀 GaN LED 准光子晶体 阳极氧化铝(AAO)模板 inductively coupled plasma etching GaN LED quasi-photonic crystal anodic aluminum oxide membrane 
无机材料学报
2020, 35(5): 561

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