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飞秒激光调控非线性光学晶体和周期性纳米结构取向

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激光与光电子学进展 2022年第15期59卷 3-11页

作者：曹晶 lancry matthieu Brisset François Poumellec Bertrand 清华大学材料学院北京100084 巴黎萨克雷大学奥赛高分子化学与材料研究所法国巴黎91405

通过高频(100~500 kHz)飞秒激光直写可在组成是Li_(2)O-Nb_(2)O_(5)-SiO_(2)的玻璃内部同时控制纳米非线性光学晶体和周期结构取向。该周期结构为发生纳米尺度相分离的晶态和非晶态交替结构,并可通过激光偏振方向来控制朝向。随着激光... 详细信息

通过高频(100~500 kHz)飞秒激光直写可在组成是Li_(2)O-Nb_(2)O_(5)-SiO_(2)的玻璃内部同时控制纳米非线性光学晶体和周期结构取向。该周期结构为发生纳米尺度相分离的晶态和非晶态交替结构,并可通过激光偏振方向来控制朝向。随着激光注入能量的增加出现了3个改性区间:低能量下改性非晶态,对氢氟酸(HF)的刻蚀速度高于玻璃基底;中能量下纳米晶体极轴趋向和激光偏振方向垂直,随着激光频率的提高,获得此区间的脉冲能量窗口急剧减小;高能量下微米晶粒,并且晶体的产生受写入模式影响(写入方向和激光偏振方向的夹角)。该研究发现有利于理解超快激光-物质相互作用和制备三维光器件。

关键词：激光技术纳米周期结构铌酸锂超快激光晶体

Tailoring chiral optical properties by femtosecond laser direct writing in silica

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Light(Science & Applications) 2023年第3期12卷 366-378页

作者： Jiafeng Lu Jing Tian Bertrand Poumellec Enrique Garcia-Caurel Razvigor Ossikovski Xianglong Zeng matthieu lancry Institut de Chimie Moléculaire et des Matériaux d’Orsay UniversitéParis SaclayOrsay91405France Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced CommunicationShanghai Institute for Advanced Communication and Data ScienceShanghai UniversityShanghai200444China LPICM CNRSEcole PolytechniqueInstitut Polytechnique de ParisPalaiseau91128France

An object that possesses chirality,that is,having its mirror image not overlayed on itself by rotation and translation,can provide a different optical response to a left-or right-handed circular polarized *** nanostructures may exhibit polarization-selective optical properties that can be controlled for micro-to-nano optical element *** attractive way to induce such complex nanostructures in three-dimension in glass is femtosecond laser direct ***,the mechanism of femtosecond laser induced chirality remains to be unveiled due to complex physical and chemical processes occurring during the ultrashort light-matter ***,a phenomenological model is proposed and is built on two-layers phase shifters to account for this laser-induced optical chirality in an initially achiral material(silica glass).This model is based on the observation that femtosecond laser induced nanogratings own two principal contributions to its aggregate birefringent response:a form and a stress-related *** refining this formalism,a multilayer approach is developed to imprint on demand optical *** up to+/-60°at 550 nm within an optimal 80μm thickness in silica glass are possible,corresponding to the highest value in a glass to *** results provide new insights of circular-optical control in micro-nano optical manufacturing and open new opportunities for photonics applications.

关键词： polarization silica circular

Parity violation in chiral structure creation under femtosecond laser irradiation in silica glass?

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Light(Science & Applications) 2016年第1期5卷 371-377页

作者： Bertrand Poumellec matthieu lancry Rudy Desmarchelier Evelyne Hervé Bernard Bourguignon SP2M/ICMMO CNRS-UPSudUniversitéParis SudUniversitéParis SaclayBâtiment 410Orsay 91405 CedexFrance Centre des matériaux Mines ParisParistechUMR CNRS-UPMC 7633BP87Evry F-91003 CedexFrance ISMO CNRS-UPSudUniversitéParis SudUniversitéParis SaclayBâtiment 210Orsay 91405 CedexFrance

The paper addresses the creation of circular optical properties from a femtosecond laser light beam with a linear polarization in an achiral material(glass)under an orthogonal *** this situation,all aspects of the experiment are achiral and therefore should not give rise to chiral property *** that observation,we propose an interpretation that involves the action of a light-induced torque on the matter carrying a light-induced dielectric *** found that a direct current(DC)electric field could be produced in the lattice by the femtosecond laser in our conditions and that a non-collinear dielectric moment is created by a nonlinear effect between the DC electric field and the stress field due to the transformation of the *** reveal that it is possible to break the chiral symmetry of glass using an intense,ultrashort laser light pulse.

关键词： chirality chiroptical properties circular dichroism femtosecond laser processing glass optical rotation silica

Angular Dependence of the Second Harmonic Generation Induced by Femtosecond Laser Irradiation in Silica-Based Glasses:Variation with Writing Speed and Pulse Energy

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World Journal of Nano Science and Engineering 2015年第3期5卷 96-106页

作者： Jing Cao Bertrand Poumellec Fran?ois Brisset Anne-Laure Helbert matthieu lancry Institut de Chimie Moléculaire et des Matériaux d’Orsay(ICMMO) CNRS-UniversitéParis SudUniversitéParis SaclayBat.420Campus Orsay91405 OrsayFrance

To control second harmonic generation (SHG) in silica-based glasses is crucial for fabricating photonic devices, such as frequency doubling waveguides. Here, we investigated SHG of laser induced nonlinear optical crystals in silica-based glasses, according to writing speed and pulse energy. We observed two regions with different probing laser polarization angular dependence: a) a well-defined cosine-like curve with period of 180° at low pulse energy (0.8 μJ) whatever the writing speed or at high pulse energy (1.4 μJ) with high writing speed (25 μm/s). This is accounted for by a well-defined texture for the nano crystals with their polar axis oriented perpendicular to the writing laser polarization;and b) a double cosine-like curve revealing a second texture of the crystals at high pulse energy (1.4 μJ) with low writing speed (5 μm/s) and with the polar axis oriented closer parallel to the writing laser polarization. Therefore, a SHG dependence on probing laser polarization angle may show high contrast by a correct choice of the writing speed and pulse energy. These results pave the way for elaboration of nonlinear optical devices.

关键词： Nonlinear Optical Crystal Glass Ceramics Direct Writing Ultrafast Processes Waveguide