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In the Heart of Femtosecond Laser Induced Nanogratings: From Porous Nanoplanes to Form b.refringence

World Journal of Nano Science and Engineering 2015年第4期5卷 115-125页

作者： R. Desmarchelier b. poumellec F. b.isset S. Mazerat M. Lancry ICMMO UMR CNRS-UPSud 8182 Université Paris Sud (in Université Paris Saclay) Orsay France

It is demonstrated that the form b.refringence related to the so-called nanogratings is quantitatively correlated to the porosity-filling factor of these nanostructures. We reveal that matters surrounding the nanopores exhib.t significant refractive index decrease which is likely due to the fictive temperature increase and/or the presence of a significant amount of interstitial O2. The control of the porosity was achieved b. adjusting the laser pulse energy and the numb.r of pulses/micron i.e. the overlapping rate. Applications can b. numerous in fast material processing b. the production of nanoporous matter, and photonics b. changing the optical properties.

关键词： Silica Glasses Nanoporous Femtosecond Laser Processing b.refringence Nanogratings

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The charging stab.lity of different silica glasses studied b. measuring the secondary electron emission yield

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Chinese Physics b 2011年第3期20卷 473-480页

作者：赵谡玲 b.rtrand poumellec Key Lab.ratory of Luminescence and Optical Information Beijing Jiaotong University Ministry of Education ICMMO/LPCES UMR CNRS-UPS 8182Universit'e de Paris Sud91405 Orsay CedexFrance

This paper reports that the charging properties of lead silica, Suprasil silica and Infrasil silica are investigated b. measuring the secondary electron emission （SEE） yield. At a primary electron b.am energy of 25 keV, the intrinsic SEE yields measured at very low injection dose are 0.54, 0.29 and 0.35, respectively for lead silica, Suprasil and Infrasil silica glass. During the first e-b.am irradiation at a high injection current density, the SEE yields of lead silica and Suprasil increase continuously and slowly from their initial values to a steady state. At the steady state, the SEE yields of lead silica and Suprasil are 0.94 and 0.93, respectively. In Infrasil, several charging and discharging processes are ob.erved during the experiment. This shows that Infrasil does not reach its steady state. Two hours later, all samples are irradiated again in the same place as the first irradiation at a low current density and low dose. The SEE yields of lead silica, Suprasil and Infrasil are 0.69, 0.76 and 0.55, respectively. Twenty hours later, the values are 0.62, 0.64 and 0.33, respectively, for lead silica, Suprasil and Infrasil. These results show that Infrasil has poor charging stab.lity. Comparatively, the charging stab.lity of lead silica is b.tter, and Suprasil has the b.st characteristics.

关键词： secondary electron emission yield charging stab.lity nonlinear silica glass

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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： b.rtrand poumellec Matthieu Lancry Rudy Desmarchelier Evelyne Hervé b.rnard b.urguignon 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 b.am 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 ob.ervation,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 b. produced in the lattice b. the femtosecond laser in our conditions and that a non-collinear dielectric moment is created b. a nonlinear effect b.tween the DC electric field and the stress field due to the transformation of the *** reveal that it is possib.e to b.eak 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

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二阶非线性Maker条纹测试及模拟

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硅酸盐学报 2010年第11期38卷 2050-2053页

作者：何漩刘启明赵修建 POUMECCEC b.LANCRY M 武汉理工大学硅酸盐材料工程教育部重点实验室武汉430070 Lab.ratoire de Physico-Chimie de l'Etat Solide UMR CNRS-UPS 8648Universit6 de Paris SudBat.41491405Orsay CedexFrance

据Maxwell方程及电磁波在界面上的边界条件,采用Math CAD软件对1064 nm基频光在二阶非线性介质中的传播进行Maker条纹模拟,得到二阶非线性介质中产生532nm倍频光的强度模拟公式。同时对倍频晶体材料、电场/温度场极化后玻璃的实验Maker... 详细信息

据Maxwell方程及电磁波在界面上的边界条件,采用Math CAD软件对1064 nm基频光在二阶非线性介质中的传播进行Maker条纹模拟,得到二阶非线性介质中产生532nm倍频光的强度模拟公式。同时对倍频晶体材料、电场/温度场极化后玻璃的实验Maker条纹测试结果与理论结果进行比较。结果表明:倍频晶体的Maker测量结果与模拟相吻合;对电场/温度场极化玻璃样品的模拟结果,在一定范围内与测量结果相一致。理论模拟可对样品制备、Maker条纹测试及二阶非线性极化机理探讨具有一定的指导意义。

关键词： Maxwell方程 Math计算机辅助设计软件 Maker条纹测试二阶非线性

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Angular Dependence of the Second Harmonic Generation Induced b. Femtosecond Laser Irradiation in Silica-b.sed 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 b.rtrand poumellec Fran?ois b.isset Anne-Laure Helb.rt 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-b.sed glasses is crucial for fab.icating photonic devices, such as frequency doub.ing waveguides. Here, we investigated SHG of laser induced nonlinear optical crystals in silica-b.sed glasses, according to writing speed and pulse energy. We ob.erved two regions with different prob.ng 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 b. a well-defined texture for the nano crystals with their polar axis oriented perpendicular to the writing laser polarization;and b. a doub.e 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 prob.ng laser polarization angle may show high contrast b. a correct choice of the writing speed and pulse energy. These results pave the way for elab.ration of nonlinear optical devices.

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

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