2015
2015
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Record 49 of
Title:Compact multi-band fluorescent microscope with an electrically tunable lens for autofocusing
Author(s):Wang, Zhaojun(1); Lei, Ming(1); Yao, Baoli(1); Cai, Yanan(1); Liang, Yansheng(1); Yang, Yanlong(1); Yang, Xibin(2); Li, Hui(2); Xiong, Daxi(2)Source: Biomedical Optics Express Volume: 6 Issue: 11 DOI: 10.1364/BOE.6.004353 Published: October 14, 2015Abstract:Autofocusing is a routine technique in redressing focus drift that occurs in time-lapse microscopic image acquisition. To date, most automatic microscopes are designed on the distance detection scheme to fulfill the autofocusing operation, which may suffer from the low contrast of the reflected signal due to the refractive index mismatch at the water/glass interface. To achieve high autofocusing speed with minimal motion artifacts, we developed a compact multi-band fluorescent microscope with an electrically tunable lens (ETL) device for autofocusing. A modified searching algorithm based on equidistant scanning and curve fitting is proposed, which no longer requires a single-peak focus curve and then efficiently restrains the impact of external disturbance. This technique enables us to achieve an autofocusing time of down to 170 ms and the reproductivity of over 97%. The imaging head of the microscope has dimensions of 12 cm × 12 cm × 6 cm. This portable instrument can easily fit inside standard incubators for real-time imaging of living specimens. ? 2015 Optical Society of America.Accession Number: 20161302156168 -
Record 50 of
Title:Improved non-negative tensor Tucker decomposition algorithm for interference hyper-spectral image compression
Author(s):Wen, Jia(1,2); Zhao, JunSuo(1); Ma, CaiWen(2); Wang, CaiLing(3)Source: Science China Information Sciences Volume: 58 Issue: 5 DOI: 10.1007/s11432-014-5165-x Published: May 1, 2015Abstract:The compression method, first proposed in 2012, is based on the non-negative tensor decomposition for interference hyper-spectral image data. As a tensor is generated by a huge amount of interference hyper-spectral images, the multiplicative update algorithm is made extremely complicated, and even unfeasible. To reduce the computational cost and speed up the convergence, this paper, based on the characteristics of interference hyper-spectral images, develops a new algorithm using different down-sampling factors for different non-negative wavelet sub-band tensors. The experimental results showed that this algorithm could significantly shorten the running time, while maintaining a good compression performance compared with the conventional methods. ? 2014, Science China Press and Springer-Verlag Berlin Heidelberg.Accession Number: 20145200358834 -
Record 51 of
Title:In situ optical measurements of Chang'E-3 landing site in Mare Imbrium: 2. Photometric properties of the regolith
Author(s):Jin, Weidong(1); Zhang, Hao(1); Yuan, Ye(1); Yang, Yazhou(1); Shkuratov, Yuriy G.(2); Lucey, Paul G.(3); Kaydash, Vadim G.(2); Zhu, Meng-Hua(4); Xue, Bin(5); Di, Kaichang(6); Xu, Bin(6); Wan, Wenhui(6); Xiao, Long(1); Wang, Ziwei(1)Source: Geophysical Research Letters Volume: 42 Issue: 20 DOI: 10.1002/2015GL065789 Published: October 28, 2015Abstract:The panorama cameras onboard the Yutu Rover of the Chang'E-3 lunar mission acquired hundreds of high-resolution color images of the lunar surface and captured the first in situ lunar opposition effect (OE) since the Apollo era. We extracted the phase curve and the color ratio in three bands with the phase angle range from 2° to 141°. Photometric inversions using the Hapke model reveal that submicroscopic dusts are present in the landing area and both the coherent backscattering and the shadow hiding are responsible for the strong OE. Compared with spaceborne measurements, the grains in the landing site are brighter, more transparent, and appear to be better crystallized than the average maria basaltic grains. The results show that the phase-reddening effect appears to be present in the in situ phase curves. The current phase curve can be used as the ground-truth validations of any future spaceborne phase curve measurement over the landing site region. Key Points The first in situ lunar phase curve since the Apollo era covers phase angle range of 2-141° Both shadow hiding and coherent backscattering contribute to the opposition surge Single-particle scattering has backward and forward scattering lobes and regolith porosity is obtained ? 2015. American Geophysical Union. All Rights Reserved.Accession Number: 20154601536936 -
Record 52 of
Title:Integrated bi-chromatically pumped optical parametric oscillator for orthogonally polarized photon pair generation
Author(s):Reimer, Christian(1); Kues, Michael(1); Caspani, Lucia(1,2); Wetzel, Benjamin(1); Roztocki, Piotr(1); Clerici, Matteo(1,2); Jestin, Yoann(1); Ferrera, Marcello(1,2); Peccianti, Marco(3); Pasquazi, Alessia(3); Little, Brent E.(4); Chu, Sai T.(5); Moss, David J.(1,6); Morandotti, Roberto(1)Source: Integrated Photonics Research, Silicon and Nanophotonics, IPRSN 2015 Volume: Issue: DOI: 10.1364/iprsn.2015.is3a.5 Published: 2015Abstract:We demonstrate a novel bi-chromatically pumped OPO operating on orthogonal polarizations in a CMOS compatible micro-ring resonator. Below threshold the device operates in the quantum regime and cross-polarized heralded photons are directly generated. OCIS codes: (270.0270) Quantum optics; (130.3120) Integrated optics devices; (190.4380) Nonlinear optics, four-wave mixing; (190.4970) Parametric oscillators and amplifiers. ? 2015 OSA.Accession Number: 20153301166155 -
Record 53 of
Title:Direct generation of cross-polarized photons on a chip
Author(s):Caspani, L.(1,2); Reimer, C.(1); Kues, M.(1); Wetzel, B.(1); Roztocki, P.(1); Clerici, M.(1,2); Jestin, Y.(1); Ferrera, M.(1,2); Peccianti, M.(1,3); Pasquazi, A.(1,3); Little, B.E.(4); Chu, S.T.(5); Moss, D.J.(6); Morandotti, R.(1)Source: Optics InfoBase Conference Papers Volume: Issue: DOI: Published: 2015Abstract:nullAccession Number: 20171403531362 -
Record 54 of
Title:Wavelength-multiplexed heralded single photon source on a chip
Author(s):Caspani, L.(1,2); Reimer, C.(1); Clerici, M.(1,2); Ferrera, M.(1,2); Kues, M.(1); Peccianti, M.(1,3); Pasquazi, A.(1,3); Razzari, L.B.(1); Little, E.(4); Chu, S.T.(5); Moss, D.J.(6); Morandotti, R.(1)Source: Optics InfoBase Conference Papers Volume: Issue: DOI: Published: 2015Abstract:nullAccession Number: 20171403531523 -
Record 55 of
Title:Burst-mode operation of a 655ghz mode locked laser based on an 11th order microring resonator
Author(s):Li, Jin(1); Pasquazi, Alessia(2); Tsang, K.S.(3); Ho, Victor(1); Peccianti, Marco(2); Cooper, Andrew(2); Caspani, Lucia(4,5); Ferrera, Marcello(5); Little, Brent E.(6); Moss, David J.(7); Morandotti, Roberto(4); Chu, Sai T.(1)Source: Optics InfoBase Conference Papers Volume: Issue: DOI: Published: 2015Abstract:We report burst operation of a mode-locked laser based on an 11th order microring resonator. ? 2014 Optical Society of America. ? 2015 IEEE.Accession Number: 20171403531420 -
Record 56 of
Title:Burst-mode operation of a 655GHz mode locked laser based on an 11-th order microring resonator
Author(s):Jin, Li(1); Pasquazi, Alessia(2); Tsang, K.S.(3); Ho, Victor(1); Peccianti, Marco(2); Cooper, Andrew(2); Caspani, Lucia(4,5); Ferrera, Marcello(5); Little, Brent E.(6); Moss, David J.(7); Morandotti, Roberto(4); Chu, Sai T.(1)Source: Integrated Photonics Research, Silicon and Nanophotonics, IPRSN 2015 Volume: Issue: DOI: 10.1364/iprsn.2015.it2b.3 Published: 2015Abstract:We demonstrate a new regime for ultrafast mode-locked lasers termed "burst-mode". By exploiting an integrated 11th-order microring resonator, a stable mode-locked pulse train at 655GHz with an envelope of 42ps at 6.45MHz is achieved. ? 2015 OSA.Accession Number: 20153301166074 -
Record 57 of
Title:Multi-correlated two-photon states within an integrated quantum frequency comb
Author(s):Kues, Michael(1); Reimer, Christian(1); Wetzel, Benjamin(1,2); Roztocki, Piotr(1); Caspani, Lucia(1,2); Grazioso, Fabio(1); Bromberg, Yaron(3); Little, Brent E.(4); Munro, William J.(5); Chu, Sai T.(6); Moss, David J.(1,7); Morandotti, Roberto(1,8)Source: Proceedings of Frontiers in Optics 2015, FIO 2015 Volume: Issue: DOI: 10.1364/fio.2015.fw4d.4 Published: 2015Abstract:By superimposing two different spontaneous four-wave mixing processes inside a bimodally pumped CMOS-compatible mircoring resonator, we report the generation of four-mode two-photon multi-correlated states and measure two-photon entanglement. ?OSA 2015.Accession Number: 20161902352392 -
Record 58 of
Title:Dual-loss-modulated passively Q-switched Tm:LuAG laser with multi-walled carbon nanotube and monolayer graphene
Author(s):Luan, C.(1); Yang, K.J.(1,2); Zhao, J.(1); Zhao, S.Z.(1); Li, G.Q.(1); Li, D.C.(1); Li, T.(1); Qiao, W.C.(1); Zheng, L.H.(3); Xu, J.(3); Wang, Q.G.(3); Xu, X.D.(3); Su, L.B.(3); Wang, Y.G.(4)Source: Applied Physics B: Lasers and Optics Volume: 120 Issue: 4 DOI: 10.1007/s00340-015-6193-y Published: September 20, 2015Abstract:By simultaneously using a multi-walled carbon nanotube (MWCNT) and a monolayer graphene saturable absorber (SA) in the cavity, a laser-diode-pumped dual-loss-modulated passively Q-switched Tm:LuAG laser at 2?μm is demonstrated for the first time. In comparison with the singly passively Q-switched laser with MWCNT or monolayer graphene SA, the doubly passively Q-switched laser with both MWCNT and monolayer graphene SA can generate shorter pulse width and higher peak power. A maximum pulse width compression ratio of 2.8 and a highest peak power enhancement factor of 4 were obtained at the incident pump power of 5.8?W, respectively. The experimental results show that the dual-loss modulation is an efficient method to compress the pulse widths and improve the peak powers of the Q-switched lasers at 2?μm. ? 2015, Springer-Verlag Berlin Heidelberg.Accession Number: 20153201113047 -
Record 59 of
Title:A maximum entropy feature descriptor for age invariant face recognition
Author(s):Gong, Dihong(1); Li, Zhifeng(1); Tao, Dacheng(2); Liu, Jianzhuang(3,4); Li, Xuelong(5)Source: Proceedings of the IEEE Computer Society Conference on Computer Vision and Pattern Recognition Volume: 07-12-June-2015 Issue: DOI: 10.1109/CVPR.2015.7299166 Published: October 14, 2015Abstract:In this paper, we propose a new approach to overcome the representation and matching problems in age invariant face recognition. First, a new maximum entropy feature descriptor (MEFD) is developed that encodes the microstructure of facial images into a set of discrete codes in terms of maximum entropy. By densely sampling the encoded face image, sufficient discriminatory and expressive information can be extracted for further analysis. A new matching method is also developed, called identity factor analysis (IFA), to estimate the probability that two faces have the same underlying identity. The effectiveness of the framework is confirmed by extensive experimentation on two face aging datasets, MORPH (the largest public-domain face aging dataset) and FGNET. We also conduct experiments on the famous LFW dataset to demonstrate the excellent generalizability of our new approach. ? 2015 IEEE.Accession Number: 20160902042563 -
Record 60 of
Title:Analytical soliton solutions for the cubic–quintic nonlinear Schr?dinger equation with Raman effect in the nonuniform management systems
Author(s):Wang, Ping(1,2); Feng, Li(1,3); Shang, Tao(1); Guo, Lixin(2); Cheng, Guanghua(4); Du, Yingjie(5)Source: Nonlinear Dynamics Volume: 79 Issue: 1 DOI: 10.1007/s11071-014-1672-y Published: January 2015Abstract:Based on the Kundu–Eckhaus equation with variable coefficients, the exact one-soliton and two-soliton solutions have been explicitly given by an appropriate similarity transformation method. As an example, an exponential distributed fiber control system, nonlinearity management system and dispersion management system have been considered, and the propagation characteristics of the exact soliton solutions in the three nonuniform management systems have been investigated in detail. Especially, the dynamic properties of the amplitude, pulse width and the central position of the soliton with transmission distance have been studied. The results have some guiding significance for soliton amplification, compression and control management, and can provide some theoretical analysis for carrying out optical soliton communication experiment. ? 2014, Springer Science+Business Media Dordrecht.Accession Number: 20150600486419