jap banner
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue Next Issue

15 Jul 2004

Volume 96, Issue 2, pp. 951-1278

Return to All Sections
back to top
RSS Feeds

Phenomenological model of anisotropic volume hologram formation in liquid-crystal-photopolymer mixtures

R. L. Sutherland, V. P. Tondiglia, L. V. Natarajan, and T. J. Bunning

J. Appl. Phys. 96, 951 (2004); http://dx.doi.org/10.1063/1.1762713 (15 pages) | Cited 45 times

Online Publication Date: 30 June 2004

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The real time formation of anisotropic volume holographic reflection gratings in a liquid-crystal/photopolymer mixture is studied. We develop a phenomenological model of grating formation that incorporates the photophysics and photochemistry of the initiator dye, reaction-diffusion kinetics of the monomer-polymer system, phase separation of the liquid crystal, nematic order evolution of liquid-crystal droplets, and volume shrinkage of the polymer. We then test this model by experimentally monitoring the diffraction efficiency for s and p polarization, Bragg wavelength, and laser scattering in real time as the grating is formed. The model yields good agreement with experimental data for different recording intensities and exposure times. We discuss the physics of the system as it evolves in time and explain the major features of anisotropic grating formation in acrylate-based holographic polymer-dispersed liquid crystals. © 2004 American Institute of Physics.
Show PACS
42.40.Eq Holographic optical elements; holographic gratings
42.70.Ln Holographic recording materials; optical storage media
42.70.Df Liquid crystals
42.70.Jk Polymers and organics
42.79.Dj Gratings
82.50.-m Photochemistry
82.20.-w Chemical kinetics and dynamics

Low frequency noise and long-term stability of noncoherent light sources

S. L. Rumyantsev, M. S. Shur, Yu. Bilenko, P. V. Kosterin, and B. M. Salzberg

J. Appl. Phys. 96, 966 (2004); http://dx.doi.org/10.1063/1.1763225 (4 pages) | Cited 15 times

Online Publication Date: 30 June 2004

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Low frequency fluctuations in light intensity were measured from five different types of commercially available light emitting diodes with wavelengths from 375 nm to 740 nm and from two different halogen lamps. At low frequencies below 10–100 Hz some light emitting diodes (LEDs) can provide lower levels of noise than halogen lamps. A noise quality factor β is proposed in order to characterize noise behavior of LEDs. © 2004 American Institute of Physics.
Show PACS
42.72.Bj Visible and ultraviolet sources
85.60.Jb Light-emitting devices
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close