Real-time direct measurement of diffraction efficiency of reflection gratings in photopolymer recording materials

2015 ◽  
Author(s):  
Petr Vojtíšek ◽  
Milan Květoň
Keyword(s):  
Real Time ◽  
Direct Measurement ◽  
Diffraction Efficiency ◽  
Reflection Gratings

Investigation on dynamic holographic display in liquid crystal film doped with carbon dots

2020 ◽  
Vol 10 (6) ◽  
pp. 780-787
Author(s):  
Hongyue Gao ◽  
Suna Li ◽  
Jicheng Liu ◽  
Wen Zhou ◽  
Fan Xu ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Electric Field ◽  
Real Time ◽  
Diffraction Efficiency ◽  
Carbon Dots ◽  
Applied Electric Field ◽  
Light Polarization ◽  
Forming Process ◽  
Time Dynamic ◽  
Holographic Display

In this paper, we studied the holographic properties of liquid crystal (LC) thin film doped with carbon dots (CDs) which can be used as real-time holographic display screen. The maximum value of diffraction efficiency can reach up to 30% by using a low applied electric field 0.2 V/μm. Holograms in the LC film can be dynamically formed and self-erased. The hologram build-up time and the hologram self-erasure time in the material is fast enough to realize video refresh rate. In addition, the forming process of hologram was studied. The holographic diffraction efficiency was measured depending on the intensity of recording light, applied electric field, the intensity of readout light, and readout light polarization direction. Triple enhancement of the diffraction efficiency value by the modulation of voltage under the condition of low recording energy is presented. Therefore, we develop an easy way to obtain real-time dynamic holographic red, green and blue displays with high diffraction efficiency, which allow the LC film doped with CDs to be used as a holographic 3D display screen.

Real-Time and Direct Measurement of Pollutants in Exhaust Gas Utilizing Supersonic Jet / Resonance Enhanced Multi-Photon Ionization

2008 ◽  
Author(s):  
Kentaro Misawa ◽  
Jun Matsumoto ◽  
Yohei Yamato ◽  
Saori Mae ◽  
Shun-ichi Ishiuchi ◽  
...  
Keyword(s):  
Real Time ◽  
Direct Measurement ◽  
Supersonic Jet ◽  
Exhaust Gas ◽  
Photon Ionization

Transient interference gratings and holograms in dyed plastic

1984 ◽  
Vol 62 (7) ◽  
pp. 669-673
Author(s):  
Sergio Calixto ◽  
R. A. Lessard
Keyword(s):  
Real Time ◽  
Diffraction Efficiency ◽  
Laser Light ◽  
Thick Layer ◽  
Double Exposure ◽  
Naked Eye ◽  
Sufficient Intensity ◽  
Exposure Holography ◽  
Reading Beam ◽  
Made In

Transient diffraction gratings were holographically made in dyed plastic by absorbing laser light. Mean energy values of 40 mJ/cm2 absorbed in a 3-mm thick layer were needed to make gratings that lasted about 10 s. The writing beams and a reading one of different wavelength were simultaneously made to fall on the plastic: the reading beam was diffracted by the grating, which produced transient diffracted beams of sufficient intensity to be seen by the naked eye or to be stored permanently by conventional photographic methods. Curves showing diffraction efficiency versus exposure with grating frequency as a parameter are presented. Applications to real-time single and double exposure holography are also discussed.

Diffraction efficiency of radially-profiled off-plane reflection gratings

2015 ◽  
Author(s):  
Drew M. Miles ◽  
James H. Tutt ◽  
Casey T. DeRoo ◽  
Hannah Marlowe ◽  
Thomas J. Peterson ◽  
...  
Keyword(s):  
Diffraction Efficiency ◽  
Reflection Gratings

Real-time direct measurement of spinal cord blood flow at the point of compression

2009 ◽  
Vol 65 ◽  
pp. S125
Author(s):  
Tadao Morino ◽  
Tadanori Ogata ◽  
Kei Morizane ◽  
Gotaro Yamaoka ◽  
Haruyasu Yamamoto
Keyword(s):  
Spinal Cord ◽  
Blood Flow ◽  
Cord Blood ◽  
Real Time ◽  
Direct Measurement ◽  
Spinal Cord Blood Flow

Real-time Measurement of Diffraction Efficiency in Holographic Materials with Nonlinear Responses

1994 ◽  
Vol 41 (10) ◽  
pp. 1867-1873 ◽  
Author(s):  
A. Fimia ◽  
R. Fuentes ◽  
F. Mateos ◽  
R. Sastre ◽  
J. Pineda ◽  
...  
Keyword(s):  
Real Time ◽  
Diffraction Efficiency ◽  
Time Measurement ◽  
Real Time Measurement ◽  
Nonlinear Responses
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