Papers by Keyword: Optical Nonlinearity

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Authors: F. Kreller, M. Lowisch, J. Puls, F. Henneberger
Authors: Hai Jin Fu, Jiu Bin Tan, Peng Cheng Hu, Zhi Gang Fan
Abstract: The heterodyne laser interferometer is widely applied in ultra-precision displacement measurement, but its accuracy is seriously restricted by the optical nonlinearity which arises from the optical mixing in the reference and measurement arms. In an ideal heterodyne laser interferometer, the beam from the laser source consists of two orthogonally linear-polarized components with slightly different optical frequencies and the two components can be completely separated by the polarizing optics, one traverses in the reference arm, the other traverses in the measurement arm, both of them are in the form of a pure optical frequency. However, in a real heterodyne laser interferometer, due to the imperfect laser polarization, the optics defect and the misalignment, the two components of the laser beam cant be perfectly separated, therefore both of the reference arm and the measurement arm contain a portion of the two laser components, which leads to an optical mixing in the two arms of the heterodyne interferometer and causes the cyclic nonlinearity of several to tens of nanometers.
Authors: M. Umlauff, W. Langbein, H. Kalt, M. Scholl, J. Söllner, M. Heuken, H. Frost, A. Nebel, R. Beigang
Authors: D. Indjin, V. Milanović, Z. Ikonić
Authors: Takumi Fujiwara, Takayuki Honma, S. Mizuno, N. Iwafuchi, Yasuhiko Benino, Takayuki Komatsu
Abstract: Investigations for space-selected structure ordering from nano-particles to single-crystal patterning in glasses will be described. Transparent crystallization in glass must be the best material solution to obtain novel functional glasses with a permanent second-order optical nonlinearity. We focus on the new functions created by structure ordering in glass by means of laser micro-fabrication for space-selected crystallization. Two topics in our recent experimental results of space-selected structure ordering in glass will be presented as follows: 1) Single crystalline patterning by atom heat laser processing in Sm-doped glasses for optical waveguides with second-order optical nonlinearity, 2) structure ordering of domains in crystallized glass fibers for possible photonic fiber-type devices with active signal processing.
Authors: Ya Ping Han, Ming Hai Luo, Qing Wen Wang, Jin Xin Wang, Xue Lian Gao
Abstract: Silver nanowires were fabricated in a direct current electric field using a solid-state ionic method, and were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The reverse saturable absorption and optical limiting properties in silver nanowires, suspended in de-ionized water were investigated by using an EKSPLA (PL2143A) picosecond laser, which produced 30 ps laser pulses at 532 nm with a repetition rate of 2 Hz. Experimental results indicate silver nanowires have obvious optical limiting properties.
Authors: Yong Yang, Masayuki Nogami, Arao Nakamura
Abstract: Gold nanoparticles were prepared by NaBH4 reduction method, and homogeneous SiO2 were coated on gold nanoparticles and assembled into densely-packed 3-dimensional arrays by the layer-by-layer self-assembly (LBL) technique. Every layer of films exhibited densely packed 2-dimensional arrays of Au@SiO2 composite nanoparticles and the film thickness was controllable through the number of deposition cycles. These multilayer films exhibited high volume fraction of gold nanoparticles (0.047). The imaginary part of the third-order nonlinear optical susceptibility (Imχ(3)) with different deposition layer have been investigated by femtosecond pump and probe spectroscopy. The Imχ(3) value is about (-8.7±3.3)×10-11 esu and almost not dependent with the layer numbers which indicates every layer of our films has the same structural and optical properties.
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