Multiwave coupling in a high-gain photorefractive polymer

1999 ◽  
Vol 24 (9) ◽  
pp. 593 ◽  
Author(s):  
K. Matsushita ◽  
P. P. Banerjee ◽  
S. Ozaki ◽  
D. Miyazaki
Keyword(s):  
High Gain ◽  
Photorefractive Polymer

Optical Limiting in a Photorefractive Polymer

1997 ◽  
Vol 479 ◽  
Author(s):  
A. Grunnet-Jepsen ◽  
C. L. Thompson ◽  
W. E. Moerner
Keyword(s):  
Phase Conjugation ◽  
Optical Limiting ◽  
High Gain ◽  
Optical Beam ◽  
Device Application ◽  
Photorefractive Polymers ◽  
Optical Limiter ◽  
Photorefractive Polymer ◽  
Salient Features

AbstractOptical limiting has been suggested as a possible device application of high gain photorefractive (PR) polymers. The principle of operation relies on the existence of amplified scattering (beam fanning) to deplete the intensity of the incident coherent optical beam. The newest photorefractive polymers show a combination of high gain and reasonable speed, and we show how these materials behave as a beam fanning optical limiter and as a limiter based on self-pumped phase conjugation. A prototype cascaded beam fanning device is demonstrated and its salient features are discussed.

Infrared-sensitive photorefractive polymer composites and fully functionalized polymethacrylates with high gain and dynamic range

2002 ◽  
Author(s):  
Eric Hendrickx ◽  
David Van Steenwinckel ◽  
Christiaan Engels ◽  
Mark Schaerlaekens ◽  
Elke Gubbelmans ◽  
...  
Keyword(s):  
Polymer Composites ◽  
Dynamic Range ◽  
High Gain ◽  
Photorefractive Polymer

Thermally stable high-gain photorefractive polymer composites based on a tri-functional chromophore

1998 ◽  
Vol 72 (14) ◽  
pp. 1679-1681 ◽  
Author(s):  
E. Hendrickx ◽  
J. Herlocker ◽  
J. L. Maldonado ◽  
S. R. Marder ◽  
B. Kippelen ◽  
...  
Keyword(s):  
Polymer Composites ◽  
High Gain ◽  
Thermally Stable ◽  
Photorefractive Polymer

Amplified scattering in a high-gain photorefractive polymer

1998 ◽  
Vol 15 (2) ◽  
pp. 901 ◽  
Author(s):  
A. Grunnet-Jepsen ◽  
C. L. Thompson ◽  
R. J. Twieg ◽  
W. E. Moerner
Keyword(s):  
High Gain ◽  
Photorefractive Polymer

Effect of energy filtering on micro-diffraction in the SEM

1994 ◽  
Vol 52 ◽  
pp. 604-605
Author(s):  
James F. Mancuso ◽  
Leo A. Fama ◽  
William B. Maxwell ◽  
Jerry L. Lehman ◽  
Hasso Weiland ◽  
...  
Keyword(s):  
Detection Efficiency ◽  
Ccd Camera ◽  
High Gain ◽  
Microchannel Plate ◽  
Electrostatic Energy ◽  
Energy Filtering ◽  
Electron Channelling ◽  
Low Energy Electrons ◽  
Low Sensitivity ◽  
Angular Field Of View

Micro-diffraction based crystallography is essential to the design and development of many classes of ‘crafted materials’. Although the scanning electron microscope can provide crystallographic information with high spatial resolution, its current utility is severely limited by the low sensitivity of existing diffraction techniques (ref: Dingley). Previously, Joy showed that energy filtering increased contrast and pattern visibility in electron channelling. This present paper discribes the effect of energy filtering on EBSP sensitivity and backscattered SEM imaging.The EBSP detector consisted of an electron energy filter, a microchannel plate detector, a phosphor screen, optical coupler, and a slow scan CCD camera. The electrostatic energy filter used in this experiment was constructed as a cone with 5 coaxial electrodes. The angular field-of-view of the filter was approximately 38°. The microchannel plate, which was the initial sensing component, had high gain and had 50% to 80% detection efficiency for the low energy electrons that passed through the retarding field filter.

Equivalent Noise Dose Obtained Through Hearing Aids in the Classrooms of Hearing-Impaired Children

1990 ◽  
Vol 21 (3) ◽  
pp. 147-150
Author(s):  
Ronald A. Wilde
Keyword(s):  
Hearing Aids ◽  
High Gain ◽  
Hearing Impaired ◽  
Deaf Children ◽  
Impaired Children ◽  
Very High ◽  
Hearing Impaired Children

A commercial noise dose meter was used to estimate the equivalent noise dose received through high-gain hearing aids worn in a school for deaf children. There were no significant differences among nominal SSPL settings and all SSPL settings produced very high equivalent noise doses, although these are within the parameters of previous projections.

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