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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...
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)]
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.
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)]
, Jerry F. Moore, Slobodan Milasinovic, Yaoming Liu
, Robert J. Gordon et al.
An ultrafast laser ablation time-of-flight mass spectrometer (AToF-MS) and associated data acquisition software that permits imaging at micron-scale resolution and sub-micron-scale depth profiling are described. The ion funnel-based source of this instrument can be operated at pressures ranging from ... [Rev. Sci. Instrum. 83, 093702 (2012)] published Tue Sep 11, 2012.
Xing Fu, J. Nathan Kutz
We theoretically demonstrate that in a laser cavity mode-locked by nonlinear polarization rotation (NPR) using sets of waveplates and passive polarizer, the energy performance can be significantly increased by incorporating multiple NPR filters. The NPR filters are engineered so as to mitigate the ... [Opt. Express 21, 6526-6537 (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)]
Gang Chen, Rainer Martini, Seong-wook Park, Clyde G. Bethea, I.-Chun A. Chen et al.
An optically induced fast wavelength shift is demonstrated in a standard middle infrared (MIR) quantum cascade laser (QCL) by illuminating the front facet with a femtosecond (fs) near infrared (NIR) laser, allowing fast optical frequency modulation (FM) for free space optical communication (FSOC) an ... [Appl. Phys. Lett. 97, 011102 (2010)] published Wed Jul 7, 2010.
Yusuke Nagai, Ryushi Fujimura, Kotaro Kajikawa
A core-resonance cylindrical whispering gallery mode (WGM) laser is reported in dye-doped nematic liquid crystals (NLCs) filled in a glass capillary. This laser runs on the basis of the properties that NLC has an extraordinary refractive index much higher than that of a glass and that it plays as a ... [J. Opt. Soc. Am. B 30, 2233-2239 (2013)]
E. Radue, E. Crisman, L. Wang, S. Kittiwatanakul, J. Lu et al.
Using both Raman spectroscopy and direct laser reflectivity measurements, we investigate the optical properties of vanadium dioxide (VO) thin films deposited on different substrates as they undergo the thermally induced insulator to metal phase transition. Comparing similarly prepared VO films grown ... [J. Appl. Phys. 113, 233104 (2013)] published Thu Jun 20, 2013.
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)]
Sha Tao, Ronald L. Jacobsen, and Benxin Wu
Investigations have been performed on the physical mechanisms of picosecond laser ablation of silicon carbide at 355 and 1064 nm, which have not been well understood yet. The study shows that the low-fluence ablation rates are close for 355 and 1064 nm, and the dominant material removal mechanism sh ... [Appl. Phys. Lett. 97, 181918 (2010)] published Thu Nov 4, 2010.
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)]
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)]
Feng Li, Edwin Ding, J. Nathan Kutz, P. K. A. Wai
We theoretically demonstrate that in a laser cavity mode-locked by a set of waveplates and passive polarizer, the energy performance can be increased by incorporating a second set of waveplates and polarizer in the cavity. The two nonlinear transmission functions acting in combination can be ... [Opt. Express 19, 23408-23419 (2011)]
Publication year: 2011 ► Inscription of long-period fibre gratings (LPFGs) in Ge/B-codoped fibre. ► Realization of Mach–Zehnder interferometer using fs UV recording of cascaded LPFGs. ► Comb filter based on a pair of LPFGs with different strength and peak position. ► Strong non-uniformity of photosensitivity along the axis of Ge/B-codoped fibre.
Source: Optics & Laser Technology, Available online 29 September 2011
Kieran Mc Evoy, David N. Nikogosyan
Using high-intensity (560–650 GW/cm) 264 nm 220 femtosecond laser pulses, we inscribed a periodic (comb) transmission filter in a photosensitive Ge/B-codoped fibre, based on a pair of long-period gratings of different strength/wavelength position. The irradiation conditions and grating parameters for the successful realization of the 24–28-nm-wide transmission filter in the region 1480–1580 nm with the fringe period of 1.7–3.1 nm and the fringe bandwidth of 0.8–1.3 nm were established.
► Inscription of long-period fibre gratings (LPFGs) in Ge/B-codoped fibre. ► Realization of Mach–Zehnder interferometer using fs UV recording of cascaded LPFGs. ► Comb filter based on a pair of LPFGs with different strength and peak position. ► Strong non-uniformity of photosensitivity along the axis of Ge/B-codoped fibre.