scholarly journals Speckle contrast reduction of laser light using a chiral nematic liquid crystal diffuser

2016 ◽  
Vol 109 (26) ◽  
pp. 261104 ◽  
Author(s):  
David J. Hansford ◽  
Julian A. J. Fells ◽  
Steve J. Elston ◽  
Stephen M. Morris
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Laser Light ◽  
Speckle Contrast ◽  
Chiral Nematic ◽  
Contrast Reduction

scholarly journals Enhancing laser speckle reduction by decreasing the pitch of a chiral nematic liquid crystal diffuser

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
David J. Hansford ◽  
Yihan Jin ◽  
Steve J. Elston ◽  
Stephen M. Morris
Keyword(s):  
Liquid Crystal ◽  
Electric Field ◽  
Nematic Liquid Crystal ◽  
Quantitative Measure ◽  
Laser Speckle ◽  
Speckle Reduction ◽  
Electric Field Amplitude ◽  
Projected Image ◽  
Speckle Contrast ◽  
Chiral Nematic

AbstractThe artefact known as speckle can plague numerous imaging applications where the narrow linewidth of laser light is required, which includes laser projection and medical imaging. Here, we report on the use of thin-film chiral nematic liquid crystal (LC) devices that can be used to mitigate the influence of speckle when subjected to an applied electric field. Results are presented which show that the speckle contrast (a quantitative measure of the presence of speckle) can be significantly reduced by decreasing the pitch of the chiral nematic LC from 2700 to 244 nm. Further reduction in the speckle contrast can be observed by operating the diffuser technology at a temperature close to the chiral nematic to isotropic transition. At such temperatures, we observe a simultaneous improvement in the transmission of light through the device and a decrease in the electric field amplitude required for the minimum speckle contrast value. We conclude by presenting a laser projected image of the 1951 USAF target with and without the LC device to demonstrate the visual improvement as a result of the speckle reduction.

A robust and inexpensive all optical switch with chiral nematic liquid crystal

2021 ◽  
Vol 119 ◽  
pp. 111306
Author(s):  
Hossein mehrzad ◽  
Ezeddin Mohajerani ◽  
Mohammad Mohammadimasoudi ◽  
Kristiaan Neyts
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Optical Switch ◽  
Chiral Nematic ◽  
All Optical ◽  
All Optical Switch

Optically activated shutter using a photo-tunable short-pitch chiral nematic liquid crystal

2013 ◽  
Vol 103 (10) ◽  
pp. 101105 ◽  
Author(s):  
S. M. Morris ◽  
M. M. Qasim ◽  
K. T. Cheng ◽  
F. Castles ◽  
D.-H. Ko ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Chiral Nematic

Studies on the electro‐optical properties of chiral nematic liquid crystal/aerosil particle composites

2008 ◽  
Vol 35 (1) ◽  
pp. 49-54 ◽  
Author(s):  
Bofu Li ◽  
Hua Huang ◽  
Xiaokang Ding ◽  
Wenbo Li ◽  
Yuhai Yin ◽  
...  
Keyword(s):  
Optical Properties ◽  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Chiral Nematic

scholarly journals Microsecond-range optical shutter for unpolarized light with chiral nematic liquid crystal

AIP Advances ◽  
2015 ◽  
Vol 5 (4) ◽  
pp. 047122
Author(s):  
Mohammad Mohammadimasoudi ◽  
Jungsoon Shin ◽  
Keechang Lee ◽  
Kristiaan Neyts ◽  
Jeroen Beeckman
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Unpolarized Light ◽  
Chiral Nematic ◽  
Optical Shutter

Broadband Reflection Gels Prepared from Microcapsules Containing Chiral Nematic Liquid Crystal with Negative Dielectric Anisotropy

2012 ◽  
Vol 27 (5) ◽  
pp. 583-589
Author(s):  
李克轩 LI Ke-xuan ◽  
王慧慧 WANG Hui-hui ◽  
张立培 ZHANG Li-pei ◽  
何万里 HE Wan-li ◽  
曹晖 CAO Hui ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Dielectric Anisotropy ◽  
Chiral Nematic
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