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Oleg Krupych, Viktoriya Savaryn, Rostyslav Vlokh
A recently proposed technique representing a combination of digital imaging laser interferometry with a classical four-point bending method is applied to a canonical nonlinear optical crystal, LiNbO_3, to precisely determine a full matrix of its piezo-optic coefficients (POCs). The contribution of ... [Appl. Opt. 53, B1-B7 (2014)]
Publication year: 2010
Source: Optics Communications, In Press, Uncorrected Proof, Available online 21 May 2010
Xiaofeng, Jin , Jianfeng, Sun , Yi, Yan , Yu, Zhou , Liren, Liu
In range-resolved reflective tomography laser radar imaging system, for accurate image reconstruction, all projections must be aligned to the center of target rotation. Due to the unknown location of the axis of rotation and random target translation, the center of target rotation in each projection cannot be measured accurately and images reconstructed based on range-resolved projections without registration would be dislocated. Here, we apply a feature tracking method to align projections data for tomographic reconstruction in laboratory-scale laser radar imaging. The target was placed on a spin table with an unknown and fixed axis, and the oscillatory motion of the...
Nature Photonics 6, 795 (2012).
Fifty years ago, researchers at a handful of laboratories around the world were reporting lasing from the first semiconductor lasers. Our IT infrastructure today relies on their diligence and success.
Christoph Schäfer, Christian Fries, Christian Theobald, Johannes A. L’huillier
Continuous-wave mode-locking of a laser exploiting the nonlinear polarization rotation (NPR) technique via Type I second harmonic generation is demonstrated for the first time. The NPR is generated by a lithium triborate crystal and transformed into nonlinear cavity losses of a 888 nm pumped ... [Opt. Lett. 38, 160-162 (2013)]
Jennifer L. Gottfried
Laser-induced breakdown spectroscopy is a promising approach for explosive residue detection, but several limitations to its widespread use remain. One issue is that the emission spectra of the residues are dependent on the substrate composition because some of the substrate is usually entrained in ... [Appl. Opt. 52, B10-B19 (2013)]
Jianmin Li, Ye Tian, Chongxiang Li
A theoretical model of far-field interference from a sphere has been established, and its applications have been investigated. When two coherent parallel laser beams shine on a smooth sphere surface from opposite directions, the reflected lights form interference fringes at far field. The fringes ... [Appl. Opt. 51, 2501-2504 (2012)]
Xinbin Cheng, Abudusalamu Tuniyazi, Jinlong Zhang, Tao Ding, Hongfei Jiao, Bin Ma, Zeyong Wei, Hongqiang Li, Zhanshan Wang
Our recent studies on nodular damage in dielectric multilayer mirrors were first reviewed, and the main findings are taken as a foundation to further investigate the influence of seed absorptivity and asymmetrical boundary on the laser-induced damage of nodules. Experimental results showed that the ... [Appl. Opt. 53, A62-A69 (2014)]
Hervé Piombini, Philippe Voarino, Fabien Lemarchand
Optical microcomponents are increasingly used in laser optical systems because of their many and novel industrial applications. These components are coated in order to enhance their optical performance, but optical characterizations are very difficult due to the shapes and small size. Thus, to ... [Appl. Opt. 50, C424-C432 (2011)]
Xin-Hong Jia, Yun-Jiang Rao, Zi-Nan Wang, Wei-Li Zhang, Zeng-Ling Ran, Kun Deng, Zi-Xin Yang
An alternative structure using third-order Raman amplification based on ultralong fiber lasers (UL-FLs) is investigated numerically to further improve the quasi-lossless transmission performance. The performance comparisons on flatness of signal distribution, optical signal–noise ratio ... [J. Opt. Soc. Am. B 29, 847-854 (2012)]
Andrew Bañas, Darwin Palima, Mark Villangca, Thomas Aabo, Jesper Glückstad
Generalized Phase Contrast (GPC) is an efficient method for generating speckle-free contiguous optical distributions useful in diverse applications such as static beam shaping, optical manipulation and recently, for excitation in two-photon optogenetics. To fully utilize typical Gaussian lasers in ... [Opt. Express 22, 5299-5311 (2014)]
Author(s): N. Boechler, J. K. Eliason, A. Kumar, A. A. Maznev, K. A. Nelson, and N. Fang
We study the interaction of surface acoustic waves (SAWs) with a contact-based vibrational resonance of 1 μm silica microspheres forming a two-dimensional granular crystal adhered to a substrate. The laser-induced transient grating technique is used to excite SAWs and measure their dispersion. The ...
[Phys. Rev. Lett. 111, 036103] Published Wed Jul 17, 2013
Publication year: 2010
Source: Optics & Laser Technology, In Press, Corrected Proof, Available online 16 July 2010
Tingting, Tang , Fushen, Chen , Bao, Sun
We study tunneling modes in a one-dimensional photonic crystal (1DPC) with multilayered periodic structures containing dispersive anisotropic single-negative (ASNG; permittivity- or permeability-negative) metamaterials. A defect layer is introduced into the proposed structure, and some unusual properties are found in contrast with that of a tunneling mode in PCs with isotropic single-negative (SNG) gaps.
Publication year: 2010
Source: Optics & Laser Technology, In Press, Corrected Proof, Available online 17 July 2010
Gangxian, Zhu , Dichen, Li , Anfeng, Zhang , Yiping, Tang
To investigate the influencing rule of deposited layer’s shape on coaxial powder feeding flow field in the metal forming process, gas–solid two-phase flow theory is used to analyze effect of deposited layers on powder concentration distribution and variation of focus distance from nozzle outlet to convergence point (the center of the convergent zone). Different height and width parameters of deposited layers were chosen to calculate the powder concentration distribution, consequently, and also their effect on additive height of single-trace cladding layer was studied by experimental investigations. The numerical results are in good agreement with experimental observations. The results indicated that...
Jonathan M. Ward, Yuqiang Wu
, Krimo Khalfi, and Sile Nic Chormaic
We report on the design of an electric tube furnace that can be used for the fabrication of doped glass microsphere lasers. The tube furnace has a short hot zone of length 133 mm and is based on a quartz tube design. Doped laser glass particles, specifically Er:Yb phosphate glass (IOG-2), of ~1 [mu ... [Rev. Sci. Instrum. 81, 073106 (2010)] published Thu Jul 15, 2010.
Publication year: 2010
Source: Optics & Laser Technology, In Press, Corrected Proof, Available online 15 July 2010
Wei, Huang , Jie-Min, Li , Li-Mei, Yang , Zhong-Liang, Jin , Zheng-Gen, Zhong , ...
A 32in RGB LED backlight unit is developed. A local dimming algorithm is designed for the backlight, and grid-noise artifacts in the LC driving signal are successfully removed with consideration of the backlight distribution to provide identical intensity from each LED block. The 32in RGB LED backlight LCD display has achieved a static display contrast of over 20000:1 and an average power reduction of 30%. We have also obtained the color gamut transformation matrix for transferring a cold cathode fluorescent lamp BLU LCD display gamut system to our RGB LED BLU LCD display gamut system, and extended the color saturation...
Chien-Sheng Liu, Yu-Ching Chang, Kun-Wei Lin, Po-Heng Lin
Effective methods for speckle reduction are essential in improving the image quality of laser imaging applications. Accordingly, the present study proposes a novel technique for reducing the speckle contrast in laser imaging applications by means of the magneto-optic Kerr effect induced by a ... [J. Opt. Soc. Am. A 31, 16-20 (2014)]
Sunil K. Sharma, Pranab K. Mukhopadhyay, Amarjeet Singh, Ranganathan Kandasamy, and Shrikant M. Oak
We have developed an efficient and high power repetitively Q-switched diode-pumped intracavity frequency doubled Nd:YAG/LiBO based green laser capable of generating 124 W of average green power with 50 ns pulse duration in a highly compact and robust linear cavity configuration. The pump to green be ... [Rev. Sci. Instrum. 81, 073104 (2010)] published Wed Jul 14, 2010.