电子科技大学光电科学与工程学院，四川 成都 610097
2~5 μm中红外波段激光在科学研究、生物医疗、通信等众多领域中都有重要的应用价值，一直以来都是激光领域的研究热点。主要对目前国内外高功率2~5 μm全固态中红外光纤激光源的发展现状进行了梳理，包括稀土离子掺杂的中红外光纤激光器、波长灵活可设计的拉曼光纤激光器和宽带超连续谱激光器，并对2~5 μm全固态中红外光纤激光源的发展进行了展望。
激光器 中红外激光 稀土离子 拉曼激光器 超连续谱 氟化物光纤
红外与激光工程
2023, 52(5): 20230215
Author Affiliations
Abstract
State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China
In this Letter, we report on widely tunable pulse generation from a red-diode-clad-pumped mid-infrared (mid-IR) codoped fiber laser, for the first time, to the best of our knowledge. Using a crystal, continuously tunable Q-switched pulses across the range of 3.06–3.62 µm have been attained, which not only represents the widest range (in wavelength domain) from a pulsed rare-earth-doped fiber laser at any wavelength, but also almost entirely covers the strong absorption band of C-H bonds in the mid-IR, providing a potential way for gas detection and polymer processing. In addition, the commercial InAs quantum-well-based saturable absorbers (SAs) have been employed instead, and the obtained longest Q-switching wavelength of 3.39 µm is slightly shorter than 3.444 µm determined by its nominal direct bandgap of 0.36 eV.
Q switching continuous tunability Fe2+:ZnSe InAs ZrF4 fiber Chinese Optics Letters
2023, 21(4): 041402
电子科技大学电子薄膜与集成器件国家重点实验室，四川 成都 610054
中红外超短脉冲激光是国际研究热点，它在激光微创治疗、聚合物精细加工、高次谐波产生、强场激光物理、超快分子成像等领域具有重要的应用前景，而锁模是产生超短脉冲的重要技术手段。本文围绕氟化物光纤激光器，从稀土离子中红外激光激射过程出发，对该波段目前常用的三种锁模方式（包括材料可饱和吸收、非线性偏振旋转、频移反馈）的工作机理、发展现状以及存在问题进行了介绍、分析与总结，并对中红外锁模光纤激光器的发展趋势进行了展望。
Author Affiliations
Abstract
1 Department of Engineering Mechanics, Soft Matter Research Center, and Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province, Zhejiang University, Hangzhou 310027, People’s Republic of China
2 State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, People’s Republic of China
Transfer printing based on switchable adhesive that heterogeneously integrates materials is essential to develop novel electronic systems, such as flexible electronics and micro LED displays. Here, we report a robust design of a thermal actuated switchable dry adhesive, which features a stiff sphere embedded in a thermally responsive shape memory polymer (SMP) substrate and encapsulated by an elastomeric membrane. This construct bypasses the unfavorable micro- and nano-fabrication processes and yields an adhesion switchability of over 1000 by combining the peel-rate dependent effect of the elastomeric membrane and the thermal actuation of the sub-surface embedded stiff sphere. Experimental and numerical studies reveal the underlying thermal actuated mechanism and provide insights into the design and operation of the switchable adhesive. Demonstrations of this concept in stamps for transfer printing of fragile objects, such as silicon wafers, silicon chips, and inorganic micro-LED chips, onto challenging non-adhesive surfaces illustrate its potential in heterogeneous material integration applications, such as flexible electronics manufacturing and deterministic assembly. Supplementary material for this article is available online.
switchable adhesive reversible adhesive transfer printing flexible electronics International Journal of Extreme Manufacturing
2021, 3(3): 035103
Author Affiliations
Abstract
1 State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, China
2 School of Physics and Information Technology, Shaanxi Normal University, Xi’an 710119, China
3 e-mail: lixiaohui0523@163.com
We demonstrate for the first time to our knowledge the use of nanoparticles for -switching a tunable mid-infrared (Mid-IR) -doped ZBLAN fiber laser around 3 μm. The -switcher was fabricated by depositing the prepared nanoparticles solution onto an Au mirror. Its nonlinear optical response was characterized using a mode locked -codoped ZBLAN fiber laser at 2.87 μm, and showed a modulation depth of 11.9% as well as a saturation intensity of . Inserting the device into a tunable -doped ZBLAN fiber laser, stable -switched pulses within the tunable range of 2812.4–3031.6 nm were obtained. When tuning the wavelength to 2931.2 nm, a maximum -switching output power of 111.0 mW was achieved with a repetition rate of 123.0 kHz and a pulse width of 1.25 μs. The corresponding pulse energy was 0.90 μJ. This demonstration suggests that nanoparticles are a promising broadband saturable absorption material for mid-infrared operation.
Photonics Research
2020, 8(1): 01000070
Author Affiliations
Abstract
State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, China
We report the first (to the best of our knowledge) tunable passively -switched -doped fiber laser around 3.5 μm. In this case, a crystal is used as the saturable absorber, and a plane-ruled grating in a Littrow configuration acts as the tuning element. At the tuned wavelength of 3478.0 nm, stable -switching with a maximum average power of 583.7 mW was achieved with a slope efficiency of 15.2% relative to the launched 1981 nm pump power. Further power scaling is mainly limited by the available 1981 nm pump power. The corresponding pulse width, repetition rate, and pulse energy are 1.18 μs, 71.43 kHz, and 7.54 μJ, respectively. By rotating the grating, the -switching can be continuously tuned in the region of 3.4–3.7 μm. To the best of our knowledge, this is the first pulsed rare-earth-doped fiber laser tunable in the region beyond 3.4 μm.
Photonics Research
2019, 7(9): 09001106
Author Affiliations
Abstract
1 State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China
2 School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
3 Aston Institute of Photonic Technologies (AiPT), Aston University, Birmingham B4 7ET, UK
4 e-mail: yanzhijin@gmail.com
5 e-mail: l.zhang@aston.ac.uk
We demonstrate a stable conventional soliton in a Tm-doped hybrid mode-locked fiber laser by employing a homemade all-fiber Lyot filter (AFLF) and a single-wall carbon nanotube. The AFLF, designed by sandwiching a piece of polarization-maintained fiber (PMF) with two 45° tilted fiber gratings inscribed by a UV laser in PMF with a phase-mask scanning technique, shows large filter depth of ～9 dB and small insertion loss of ～0.8 dB. By optimizing the free spectral range of the AFLF, the Kelly sidebands of a conventional soliton centered at 1966.4 nm can be dramatically suppressed without impairing the main shape of the soliton spectrum. It gives the pulse duration of 1.18 ps and bandwidth of 3.8 nm. By adjusting the temperature of the PMF of the AFLF from 7°C to 60°C, wavelength tunable soliton pulses ranging from 1971.62 nm to 1952.63 nm are also obtained. The generated soliton pulses can be precisely tuned between 1971.62 nm and 1952.63 nm by controlling the temperature of the AFLF.
Photonics Research
2019, 7(2): 02000103
