Low Threshold Self-Pumped Phase Conjugation of an Ar+-Laser Beam in Dye-Doped Nematic Liquid Crystals

1996 ◽  
Vol 282 (1) ◽  
pp. 429-435 ◽  
Author(s):  
P. Meindl ◽  
R. Macdonald ◽  
H. J. Eichler ◽  
O.L. Antipov
Keyword(s):  
Liquid Crystals ◽  
Laser Beam ◽  
Phase Conjugation ◽  
Nematic Liquid Crystals ◽  
Low Threshold

scholarly journals Pump-Controlled Plasmonic Random Lasers from Dye-Doped Nematic Liquid Crystals with TiN Nanoparticles in Non-Oriented Cells

2019 ◽  
Vol 10 (1) ◽  
pp. 199 ◽  
Author(s):  
Yuan Wan ◽  
Luogen Deng
Keyword(s):  
Liquid Crystals ◽  
Emission Spectrum ◽  
Localized Surface Plasmon Resonance ◽  
Nematic Liquid Crystals ◽  
Localized Surface Plasmon ◽  
Random Lasing ◽  
Random Lasers ◽  
Tin Nanoparticles ◽  
Low Threshold ◽  
Underlying Mechanisms

Manipulation of the performance of the random lasers from dye-doped nematic liquid crystals with TiN nanoparticles in non-oriented cells is studied. The experimental results show that the introduction of TiN nanoparticles into dye-doped nematic liquid crystals significantly reduces the threshold of random lasing due to the localized surface plasmon resonance of TiN nanoparticles. The emission spectrum of random lasers can be controlled by the shape of the pump spot. The threshold of random lasers increases with the decrease of the length of pump stripe. In order to obtain the emission spectrum with fine discrete sharp peaks, the narrow pump stripe is more effective than the circular pump spot. When the pump area is more like a circle, the emission spectrum is more like an amplified spontaneous emission. The underlying mechanisms of these phenomena are discussed in detail. This study provides a promising platform for designing the high-quality and low-threshold random lasers which can be controlled by the shape of the pump spot.

Optical reorientation in nematic liquid crystals controlled by the laser beam shape

1999 ◽  
Vol 171 (1-3) ◽  
pp. 131-136 ◽  
Author(s):  
L. Marrucci ◽  
F. Vetrano ◽  
E. Santamato
Keyword(s):  
Liquid Crystals ◽  
Laser Beam ◽  
Nematic Liquid Crystals ◽  
Beam Shape

Laser Beam Induces Reorientation in Nematic Liquid Crystals

2010 ◽  
Vol 428-429 ◽  
pp. 224-227
Author(s):  
I Min Jiang ◽  
Yu Jen Chen ◽  
Wen Chi Hung ◽  
C.T. Kuo ◽  
D.J. Jang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Liquid Crystals ◽  
Laser Beam ◽  
Nematic Liquid Crystals ◽  
Beam Propagation ◽  
Isotropic Phase ◽  
Optical Alignment ◽  
Optically Induced

Nematic liquid crystals (NLCs) can be easily reoriented by the laser beam at the temperature closed to the nematic–isotropic phase transition (TNI). At the temperature closed to TNI, the propagating mode of laser beam and the optically induced phase transition were explored by using a microscopic conoscope technique. This investigation demonstrates the formation of soliton at particular beam propagation modes. The interaction between nematic liquid crystals and the laser beam with different polarizations showed the nonlinearity in optical alignment.

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