1,360,504 research outputs found
Simultaneous poling and planar waveguide fabrication in glasses
No full textFabrication of buried planar waveguides with 2nd order nonlinear susceptibility in the upper cladding is carried out in soda-lime and BK7 glass substrates in one step by thermal poling
Who needs contacts? Optical fiber poling by induction
No full textConventional thermal poling methods require direct physical contact to internal fibers electrodes. Here, we report a novel indirect method in which external fields are used to charge floating internal electrodes to generate depletion regions for SHG
An Investigation into the Role of Capping on Second Harmonic Generation from Nonlinear Organic Polymer and Guest-Host Thin Films by In-situ Poling
No full textIn attempts to fabricate thermally stable second-order nonlinear polymer thin films, we have investigated the second harmonic generation (SHG) from both nonlinear polymer and guest-host thin films. We have also investigated the role of capping on the SHG, temporal stability and relaxation of dipole alignment. Corona poling techniques were employed to orient the dopants into the noncentrosymmetric structure required to obtain the SHG. The effect of capping with a polymeric encapsulant below the glass transition temperature of the polymers on the unpoled and corona poled thin films was studied. Capping of the nonlinear polymer and guest host thin films have resulted in high SHG with good temporal stability. SHG signal falls drastically during the first 8 days after poling while no further significant decay in SHG signal was observed after about 33 days. Our investigations have identified the characteristics required for a good encapsulant on a non-con-ductive surface
Effect of minority species on thermal poling of used silica glasses
No full textHigh second-order nonlinearity (SON) in poled silica glasses is of great interest for the development of linear electro-optic modulators and frequency converters monolithically integrated into optical fibres or planar glass waveguides. However, its origin is not fully understood. The extrinsic effects of poling time and voltage on second-harmonic (SH) generation in thermally-poled silica glass have been studied. In particular the quadratic dependence of the maximum SH signal on the applied voltage indicated linear dependence of the SON on internal electric field. There are several studies on intrinsic effects associated with defects and minority species such as OH and Na in thermal poling of silica glasses. In this work we carried out a systematic analysis of oxygen related defects and impurities (OH and Na) in commercial fused silica glasses (without relying on their catalogue data) and discuss their effects on SON
Jerry Poling Oral History Interview
No full textJerry Poling is the author of the book, A Summer Up North, and has been involved with much research and work on baseball in Eau Claire, Wisconsin. Mr. Poling discusses what prompted him to write his book, the love of baseball in Eau Claire, Wisconsin and the surrounding area, and his desire to learn more about Hank Aaron's time in Eau Claire. A comparison between baseball in Eau Claire and baseball nationwide was made involving the progress of baseball in Eau Claire from the 1860s to the 1950s and to the present Northern League team. Mr. Poling, a news-wire editor and a columnist for the Eau Claire Leader Telegram, commented on media coverage of baseball and how the media shaped baseball or vice-versa and how the baseball-media relationship compares to media in other sports. Mr. Poling discussed how he assembled his book, what he learned after the book was published that could have been included, such as his attempt to determine if Ann Landers attended any of Hank Aaron's games. Mr. Poling discusses the Eau Claire Express and other teams of that level. Mr. Poling mentions how his sources felt about how African-American players were viewed and treated in Eau Claire, how the newspaper covered high school baseball but not other youth baseball, and how media accommodations for Carson Park are limited and have changed a little over time. Mr. Poling's most memorable baseball game was during the Brewers' 1982 American League Championship Series. Mr. Poling reminisces about his first trip to a major league ballpark and comments on the present day Brewers team
Parents Weekend: Pastor Scott Poling
No full textScott Poling speaks on concept of religion during the Parents’ Weekend Chapel.
Scott Poling is Senior Pastor of Harvest Bible Church in Oswego, Illinois. Scott and wife Carla have five children including Brynna, a senior at Taylor, and Grason, a junior. Scott graduated from Cedarville University (1990) and Dallas Theological Seminary (1994). Scott enjoys running, hiking in national parks, the Jersey shore, and spending time with family enjoying life’s simple pleasures
Effects of poling process on KNN-modified piezoceramic properties
No full textThe influence of the orthorhombic to tetragonal phase transition near room temperature in the poling process of KNN-modified piezoceramics was studied. Poling temperatures of 25° and 120°C were used. The percentage of 90° domains reorientation induced by poling was evaluated trough X-ray diffraction analysis. The improvement of the piezoelectric properties when the poling temperature was 25°C could not be explained by the reorientation of 90° domains alone. Raman spectroscopy evidenced that the polarization process was assisted by the stabilization of orthorhombic phase, which promotes a stress reduction in the material.Postprint (published version
Leaky-modes excitation in thermally poled nanocomposite glass and their exploitation for saturable absorption
No full textThermal poling is used to create a reduced index layer in a soda-lime/nanocomposite film. Leaky-modes have been exploited to enhance interaction of light with Au-nanoparticles and demonstrate saturable absorption characteristics in line with state-of-the-art technology
Effect of poling conditions on the out-of-plane displacement for a shear mode PZT actuator
No full text[[abstract]]A shear mode plate-shaped lead zirconate titanate (PZT) actuator for a novel actuating module in a microdroplet ejecting system was fabricated
and tested. A novel poling design with both poling electrodes on the same surface is proposed. The actuator is made with lateral polarization
parallel to the plane, in contrast to the conventional actuator with the polarization along the plate-thickness direction. Due to the requirement for
the excellent electromechanical coupling characteristics, the samples poled under various poling conditions were tested and compared to determine
the optimum conditions. The poling conditions, including the poling voltage, poling temperature and poling duration, affect the electromechanical
characteristic or output actuated displacement. The distribution of electric field in the sample during poling was simulated using commercial finite
element method (FEM) software to predict the appropriate poling voltage. Experimental results indicate that the optimum conditions are a poling
voltage of 7 kV, a poling temperature of 120 ◦C and a poling duration of 10 min. The sample with the optimum condition has the highest out-of-plane displacement of 400 nm under an actuating peak-to-peak voltage of 120Vpp
2pm/V in poled Bismuth-Zinc-Borate high index glass
No full textThermal poling freezes an intense static electric field (Edc) in glass resulting in a permanent second-order nonlinearity via a rectification process: χ(2) = 3χ(3)Edc. The low third-order nonlinearity limits the χ(2) of silica glass to 0.7 pm/V. Hence, poling of high χ(3) glasses offers an attractive route towards glass based integrated electro-optical modulators and frequency converters for which χ(2) of the order of 5 pm/V or higher would be desirabl
- …
