Jianda Shao

Shanghai Institute of Optics and Fine Mechanics, CAS, Shanghai, Shanghai Shi, China

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Publications (304)466.87 Total impact

  • Zhou Fang · Yuan’an Zhao · Jianda Shao ·

    Optik - International Journal for Light and Electron Optics 11/2015; DOI:10.1016/j.ijleo.2015.10.210 · 0.68 Impact Factor
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    ABSTRACT: The plasma scald damage is the most typical laser damage morphology presented on the laser conditioned HfO2/SiO2 mirrors. In order to provide guidance for defining the acceptance quantitative specification for the plasma scald on these laser conditioned mirrors, the simulations about the downstream beam modulations of the plasma scald are investigated based on its damage characteristics and the diffraction theory. The single plasma scald with the typical size, induced by the laser conditioning, can hardly cause damage to the downstream optics and its influence on the beam contrast can be reduced easily with the increment of the propagation distance. Those with small size and large depth, or those with big size and shallow depth can also hardly induce downstream damage, but the beam contrasts become worse with the increment of the size of the concave part as well as its depth. For a maximum plasma scald observed on the laser conditioned mirror, the intensity modulation peak is close to 1.3 and the beam contrast reaches to 25% even at 2 m downstream from the mirror. For multi plasma scalds, more diffraction rings show up in the downstream beam and further decrease the overall uniformity of the beam. The uniformity of the beam gets worse as the number of the plasma scald is increased. When the density of the plasma scald with the typical size in these 1ωHfO2/SiO2 mirrors reaches 20 per 1 cm2, the beam contrast is less than 6%.
    Optics Communications 10/2015; 355. DOI:10.1016/j.optcom.2015.06.076 · 1.45 Impact Factor
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    ABSTRACT: The laser damage resistance of the coatings for high-power laser systems depends greatly on the surface quality of the substrate. In our work, experimental approaches were employed to understand the interface coupling effect of the substrate surface and coatings on the laser resistance of the coatings. A 1064 nm anti-reflection (AR) coating was deposited by an e-beam coater onto fused silica with and without micro-scale pits (structural defects). The micro-scale pits were precisely fabricated by femtosecond laser processing to prevent the emergence of subsurface cracks. Different deposition temperatures were characterized in order to verify the intensity of the interface coupling effect of the substrate and coating layers. Our experimental results indicate that impurities that are introduced in the finishing process, shifted to the substrate surface, and aggregated during the heating process, play a much more crucial role than structural defects (length: ∼7 μm; width: ∼3 μm; depth: ∼0.8 μm) in the laser-induced damage process. By effectively reducing the intensity of the interface coupling effect, the e-beam AR coatings, whose laser-induced damage resistance was closed to the bare substrate, was prepared.
    Optics Letters 08/2015; 40(16):3731-4. DOI:10.1364/OL.40.003731 · 3.29 Impact Factor
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    ABSTRACT: The variation of scattering and absorption in DKDP crystals by laser conditioning was investigated by combining light scattering technique and on-site transmittance measurement technique. Laser-induced disappearance of scattering defects was observed, and variation of transmittance was achieved. Using Mie theory, a kind of absorbing defects, aside from scattering defect, was discovered. Moreover, the experimental results demonstrated that the absorption of crystal could be mitigated by laser conditioning.
    Optics Express 06/2015; 23(12):16273. DOI:10.1364/OE.23.016273 · 3.49 Impact Factor
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    Hu Wang · Hongji Qi · Meng Guo · Yingjie Chai · Bin Wang · Kui Yi · Jianda Shao ·
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    ABSTRACT: The near-field phase modulation (NFPM) caused by the plasma scalds is investigated with a newly proposed mixed overcoat layer model. Based on the NFPM, the far-field intensity modulation (FFIM) is calculated and discussed with the scalar diffraction theory. The results indicate that both the NFPM and FFIM are sensitive to the scalding depth. A feature curve is developed to analyze the NFPM for arbitrary scalding depth. The modulation can be ignored when the scalding depth is less than the first feature point in the feature curve. Even though the diffraction intensity in the Fresnel region can be enhanced dozens of times, the FFIM in the Fraunhofer region can recover gradually if the scalding depth is below a critical value. The preliminary experimental results are consistent with the theoretical prediction.
    Optics Letters 06/2015; 40(12):2925-2928. DOI:10.1364/OL.40.002925 · 3.29 Impact Factor
  • Bin Wang · Hongji Qi · Hu Wang · Yanyan Cui · Jialu Guo · Yun Cui · Youchen Liu · Kui Yi · Jianda Shao ·
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    ABSTRACT: Amorphous TiO2 nanostructured thin films (TNFs) were deposited by the glancing angle deposition technique (GLAD) with an electron gun. All of the prepared TNFs were composed of discrete nanoscale columns, characterized by scanning electron microscope. With the annealing treatment, the pure anatase phase was transformed from amorphous TNFs. The morphological, structural and optical properties of TNFs under the annealing treatment were measured, and the evolvement mechanism was further analyzed. The optimum annealing temperature for the pure anatase precipitation of TNFs is about 400°C. The variation of morphology, chemical state and crystallization of TNFs also resulted in the shift of the transmittance spectra. The results show that appropriate postannealing treatment can build fine nanostructures and pure anatase precipitation, which can support the applications and researches about the anatase phase TNFs powerfully.
    Optical Materials Express 06/2015; 5(6):1410. DOI:10.1364/OME.5.001410 · 2.84 Impact Factor
  • Zehan Li · Juan Du · Yuanan Zhao · Yueliang Wang · Yuxin Leng · Jianda Shao ·
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    ABSTRACT: The effect of nanosecond laser conditioning on the femtosecond laser-induced damage behaviors of Al<sub>2</sub>O<sub>3</sub>, HfO<sub>2</sub>, SiO<sub>2</sub> single layers and Al<sub>2</sub>O<sub>3</sub>/SiO<sub>2</sub> high reflectors (HR) are explored. During femtosecond laser damage test, negative effects on enhancing the femtosecond laser-induced damage threshold (LIDT) of optical films after the nanosecond laser conditioning is found, which is opposite to the LIDT improvement in the nanosecond range. To explain the mechanism after nanosecond laser conditioning, a theoretical model including multiphoton ionization (MPI), avalanche ionization (AI) and decays of electrons with one defect state is built to simulate the evolution of electron density in the conduction band. A permanent mid-gap defect state resulting from the process of laser conditioning is introduced in our model, which is found to contribute seed electrons to conduction band and hence accelerate the final breakdown. Both the experimental result and theoretical calculation agree very well with each other.
    Optics Express 06/2015; 23(11):14774. DOI:10.1364/OE.23.014774 · 3.49 Impact Factor
  • Jianguo Wang · Weili Zhang · Meiping Zhu · Kui Yi · Jianda Shao ·
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    ABSTRACT: A broadband metamaterial absorber (MA) based on the titanium nitride (TiN) nano-disk array is studied using finite difference time domain simulations. The semiconducting indium tin oxide (ITO) thin film is introduced as the space layer in this sandwiched structure. Utilizing the symmetrical geometry of the MA structure, polarization insensitivity of the broadband absorption was gained. The absorber with TiN nano-disk array shows a peak absorbance of 99 % and larger than 98 % from 560 to 675 nm by numerical simulation. This compact design may have potential applications in the plasmonic sensing and photovoltaic devices.
    Plasmonics 05/2015; DOI:10.1007/s11468-015-9962-x · 2.24 Impact Factor
  • Hu Wang · Hongji Qi · Bin Wang · Yanyan Cui · Yingjie Chai · Yunxia Jin · Kui Yi · Jianda Shao ·
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    ABSTRACT: A rigorous electromagnetic method is developed to analyze the resonance effect of near field caused by nanoscale subsurface defects, which play a key role in describing absorption enhancement during laser-matter interaction for transparent dielectric materials. The total electric field calculated with this new method is consistent with the result of finite-difference time-domain simulation. The concept of mode amplitude density spectrum is developed to analyze the specific modes of the total field. A new mode parameter is proposed to demarcate the contribution of the resonance. The frequency space is divided into four parts and the resonance effect is analyzed as well as the contributions of different modes to the total field. The influence of the structure parameters on the near-field modulation and energy transference is also discussed. It is found that the enhancement mechanism of the near-field and local absorption is the resonance effect caused by the total internal reflection on the sidewall of the nanostructure. In addition, the surrounding energy is mainly guided into the structure by the root of the structure via the energy flow analysis.
    Applied Optics 05/2015; 54(14):4318-26. DOI:10.1364/AO.54.004318 · 1.78 Impact Factor
  • Yingjie Chai · Meiping Zhu · Zhengyuan Bai · Kui Yi · Hu Wang · Yun Cui · Jianda Shao ·
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    ABSTRACT: The laser damage resistance of coatings in high-power laser systems depends significantly on the surface quality of the substrate. In our experiment, pits were precisely fabricated on the surface of fused silica substrate using a femtosecond laser processing bench. The HfO2/SiO2 high-reflective coatings at 1064 nm were deposited by conventional e-beam evaporation onto fused silica substrates with and without pits, respectively. The internal crack that was induced by the substrate geometrical structure was first observed in our experiment. The laser-induced damage threshold test showed negative effects of the substrate pits on the laser resistance of high-reflective coatings. Simulations by the finite element method were carried out, and results demonstrated that the modulation of a high reflector multilayer geometry could lead to electrical-field amplification and reduce laser damage resistance. Combined with its poor mechanical properties, the pits on substrate could contribute to the occurrence of damages.
    Optics Letters 04/2015; 40(7). DOI:10.1364/OL.40.001330 · 3.29 Impact Factor
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    Yingjie Chai · Meiping Zhu · Zhengyuan Bai · Kui Yi · Hu Wang · Yun Cui · Jianda Shao ·

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    Hu Wang · Hongji Qi · Bin Wang · Yanyan Cui · Meng Guo · Jiaoling Zhao · Yunxia Jin · Jianda Shao ·
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    ABSTRACT: By considering the rapid change of standing-wave electric-field and assuming the interface defect distribution, an improved model is developed to analyze the defect density distribution and assess the damage performance of high-reflective coatings. Two kinds of high-reflective coatings deposited by e-beam evaporation (EBE) and ion beam sputtering (IBS) techniques are analyzed with this method. The lower overall damage threshold is the major feature for the coatings deposited by IBS method according to the defect parameters extracted from the model. Typical damage morphologies of coatings are also measured and analyzed. The assumption of interface defects is supported by the damage behavior. The damage mechanisms of two high-reflective coatings are attributed to the formation of molten pool and mechanical ejection. The influence of the incident angle on the damage probability is also considered and numerically calculated. The defect analysis model improved here is suitable for high-reflective coatings.
    Optics Express 02/2015; 23(4). DOI:10.1364/OE.23.005213 · 3.49 Impact Factor
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    ABSTRACT: Rapid growth processing of KDP crystals was improved by employing continuous filtration to eliminate bulk defects. The performances of the KDP crystals, including scattering defects, laser damage resistance and transmittance, were measured and analyzed. Compared with rapid-grown KDP without continuous filtration, the transmittance in the near-infrared was increased by at least 2%, almost all of ‘micron size’ defects were eliminated and ‘sub-micron size’ defects were decreased by approximately 90%. Laser damage testing revealed that the laser-induced damage thresholds (LIDTs), as well as the consistency of the LIDTs from sample to sample, were improved greatly. Moreover, it identified that ‘micron size’ defects were the precursors which initiated laser damage at relative lower laser fluence (4-6 J cm−2), and there was a lower correlation between smaller size scattering defects and laser damage initiation. The improved consistency in the LIDTs, attributed to elimination of ‘micron size’ defects, and LIDT enhancement originated from the decreased absorption of the KDP crystals.
    01/2015; 3. DOI:10.1017/hpl.2015.7
  • Xiulan Ling · Gao Wang · Yuanan Zhao · Jianda Shao · Zhengxiu Fan ·
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    ABSTRACT: The laser-induced damage characteristics and adsorption effects of organic contamination molecules of two high reflectors (HR) prepared by electron beam evaporation (EB) and ion beam sputtering (IBS) method at 1064 nm is investigated in vacuum. It is found that EB films show the performance degradation of laser induced damages in vacuum while for IBS film, seems to have no this effect, in comparison with air environment. In addition, EB coatings also have the strong affinity with organic contamination molecules, in contrast of IBS films. The results reveal that ion beam sputtering (IBS) method seem to be one of the favorite film deposition techniques of the optical films used in vacuum and space environments.
    Optik - International Journal for Light and Electron Optics 11/2014; 125(21):6474–6477. DOI:10.1016/j.ijleo.2014.08.039 · 0.68 Impact Factor
  • Jun Cao · Aihuan Dun · Chaoyang Wei · Jianxun Gu · Jianda Shao ·
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    ABSTRACT: In the inertial confinement fusion (ICF) system, the mid-frequency errors of optical components will cause high-frequency modulation and nonlinear gain of laser beams. In this paper, theoretical simulations and experiments have been designed and operated, aiming at studying the effects of slotting methods on mid-frequency errors in Nd-doped glass continuous polishing. Based on Preston formula, theoretical simulations focus on the effects of slotting methods on the mid-frequency errors. The simulation results show that different slotting methods will cause different mid-frequency errors, and square and logarithmic shape grooves are easier to obtain smaller mid-frequency errors. On the basis of simulation results, two groups of experiments are carried out to do the Nd-doped glass continuous polishing. The results show that the mid-frequency error gradually decreases with the decrease of the spacing between grooves. The results also show that square shape groove is easier to get a smaller mid-frequency error than circular shape groove, which verifies the theoretical simulation results.
    7th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2014); 08/2014
  • Jiafeng Xu · Xueke Xu · Wenlan Gao · Chaoyang Wei · Minghong Yang · Jianda Shao ·
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    ABSTRACT: The low surface laser damage threshold of fused silica components in high power laser systems such as NIF restricts the improvement of the output fluence of those systems. Once damage is initiated and grows under subsequent laser shots, the components will go unusable. Subsurface damage (SSD) introduced during manufacturing has been identified as a main damage initiator. A good knowledge of SSD and how manufacturing influences it is essential to optimize manufacturing processes for damage free optics. Using the magneto-rheological finishing (MRF) wedge technique of better accuracy attributed to a tip, we have characterized the subsurface damage on fused silica optical surfaces ground with loose Al2O3 abrasives of different sizes. Larger abrasives generates longer cracks and the number density of cracks decreases sharply with the depth for each size. Rogue particles account for the occurrence of trailing indent scratches. Addition of rogue abrasives into relatively small base abrasive extends SSD more deeply than that induced by rogue abrasives alone. The linear model, with the proportional coefficient 3.511, fits the relationship between SSD depth and surface roughness (SR) better than the quadratic polynomial one. We believe SSD depth relates to SR more statistically than following some specified physical law. The linear relationship between SSD depth and the abrasive size was also established. The abrasive size turned out not to be as a good indictor of SSD depth as SR.
    7th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2014); 08/2014
  • Bin Wang · Hongji Qi · Hu Wang · Yingjie Chai · Wei Sun · Yongqiang Hou · Kui Yi · Jianda Shao ·
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    ABSTRACT: Wave propagation of symmetry incidence on the biaxial birefringent film is discussed in this paper based on the characteristic matrix method. Furthermore, based on the refractive index surface, the refractive indices and effective optical admittances of the forward and backward propagating extraordinary waves (p-polarized wave) are analyzed in detail. With regard to the symmetry incidence, optical properties, such as the input optical admittance, transmittance and reflectance, are not identical for an extraordinary wave under common condition, i.e., angular selectivity. Based on an analysis of refractive index surface, the effective optical admittances of the forward and backward propagating extraordinary waves are equal in this particular case; transmittance and reflectance under the symmetry incidence are completely overlapped, similar to findings in the isotropic thin film. We validate our analysis using the developed software package. Based on the novel theory analysis, we can gain a new perspective of symmetry incidence about angular selectivity for the biaxial birefringent film.
    Optics Communications 08/2014; 325:1–4. DOI:10.1016/j.optcom.2014.03.079 · 1.45 Impact Factor
  • Wei Sun · Hongji Qi · Zhou Fang · Zhenkun Yu · Kui Yi · Jianda Shao ·
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    ABSTRACT: Commercial fused silica (50 mm diameter × 5 mm thickness) irradiated by single pulse of Nd:YAG laser (1064 nm, 12 ns) is experimentally investigated. The exit surface of fused silica is easier to be damaged than the entrance surface, so in this paper we only study the damage formed on the exit surface. The typical damage morphologies, irradiated at normal and oblique incidence, were observed with scanning electron microscope and atomic force microscope. The concentric ring structures with a central defect precursor are appeared in all damage sites. Furthermore, the whole damage sites are filled with the surface periodic striped structures, which direction is perpendicular to the incident electric field. Further analysis show that the incident energy has great effect on the size of damage sites, the depth of damage sites, and also the depth of the ripples, but has no effect on the period of the ripples. Additional experiments are performed to investigate the dependency between the period of ripples and the incident angle.
    Applied Surface Science 08/2014; 309:79–84. DOI:10.1016/j.apsusc.2014.04.179 · 2.71 Impact Factor
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    ABSTRACT: The CO2 laser mitigation method has been developed to mitigate the ultraviolet laser damage site on a fused silica surface. The mitigation process was monitored by an on-line white light scattering imaging system in order to ensure that the mitigation is successful. Additionally, a total internal reflection microscope was utilized to analyze the mitigation pit. By optimizing the laser mitigation parameters, the rough damage site can be replaced by a smooth Gaussian-shaped mitigation pit. The chemical composition of the damage sites and the CO2 laser mitigation pits was also measured with energy dispersive x-ray spectroscopy. It reveals that the oxygen deficiency center defect of the ultraviolet laser damage site is removed after CO2 laser mitigation, which helps us better understand the CO2 laser mitigation process. (C) 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)
    Optical Engineering 08/2014; 53(8):084107. DOI:10.1117/1.OE.53.8.084107 · 0.95 Impact Factor
  • Meiping Zhu · Kui Yi · Hongji Qi · Weili Zhang · Yuanan Zhao · Jianda Shao ·
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    ABSTRACT: High performance optical coatings are essential for the laser systems. To increase the performance of the laser coatings, including optical and mechanical properties, as well as the laser induce damage resistance, many efforts have been done. The developments of the coating design, deposition process and post treatment process, as well as the understanding of mechanical and laser damage mechanism have promoted the advance the laser coatings, various coatings with high performance have been developed.
    2014 International Conference Laser Optics; 06/2014

Publication Stats

2k Citations
466.87 Total Impact Points


  • 2003-2015
    • Shanghai Institute of Optics and Fine Mechanics, CAS
      • Key Laboratory of Materials for High Power Laser, CAS
      Shanghai, Shanghai Shi, China
  • 2000-2013
    • Chinese Academy of Sciences
      • • Anhui Institute of Optics and Fine Mechanics
      • • Shanghai Institute of Optics and Fine Mechanic
      Peping, Beijing, China
  • 2009
    • San Diego Zoo
      San Diego, California, United States
    • North University of China
      Yangkü, Shanxi Sheng, China
  • 2008
    • Shanghai Second Polytechnic University
      Shanghai, Shanghai Shi, China