Study of low-threshold and high-intensity random lasing in dye doped liquid crystals

2016 ◽  
Vol 28 (2) ◽  
pp. 022005 ◽  
Author(s):  
Lihua Ye ◽  
Yan Wang ◽  
Yangyang Feng ◽  
Chong Zhao ◽  
Guohua Hu ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
High Intensity ◽  
Random Lasing ◽  
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.

Low threshold random lasing in dye-doped and strongly disordered chiral liquid crystals

2020 ◽  
Vol 8 (5) ◽  
pp. 642
Author(s):  
Shaohua Gao ◽  
Jiayi Wang ◽  
Wenhua Li ◽  
Xuanyi Yu ◽  
Xinzheng Zhang ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Random Lasing ◽  
Low Threshold ◽  
Chiral Liquid Crystals

scholarly journals Low–Threshold and High Intensity Random Lasing Enhanced by MnCl2

Materials ◽  
2016 ◽  
Vol 9 (9) ◽  
pp. 725 ◽  
Author(s):  
Zhenzhen Shang ◽  
Mingchao Yang ◽  
Luogen Deng
Keyword(s):  
High Intensity ◽  
Random Lasing ◽  
Low Threshold

scholarly journals Electrically controllable random lasing from dye-doped nematic liquid crystals within a capillary fiber

2018 ◽  
Vol 8 (9) ◽  
pp. 2910 ◽  
Author(s):  
Ja-Hon Lin ◽  
Jun-Wei Huang ◽  
Jin-Jei Wu ◽  
Shwu-Yun Tsay ◽  
Yao-Hui Chen
Keyword(s):  
Liquid Crystals ◽  
Nematic Liquid Crystals ◽  
Random Lasing

Ultrastable and Low-Threshold Random Lasing from Narrow-Bandwidth-Emission Triangular Carbon Quantum Dots

2018 ◽  
Vol 7 (2) ◽  
pp. 1801202 ◽  
Author(s):  
Fanglong Yuan ◽  
Zifan Xi ◽  
Xiaoyu Shi ◽  
Yunchao Li ◽  
Xiaohong Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Carbon Quantum Dots ◽  
Random Lasing ◽  
Narrow Bandwidth ◽  
Low Threshold

scholarly journals Separation of the ‘blue’ and ‘green’ mechanisms of foveal vision by measurements of increment thresholds

1946 ◽  
Vol 133 (873) ◽  
pp. 418-434 ◽  
Keyword(s):  
Test Stimulus ◽  
High Intensity ◽  
Light Adaptation ◽  
Foveal Vision ◽  
Low Intensity ◽  
Individual Variations ◽  
Low Threshold ◽  
Intense Light ◽  
The Individual ◽  
Very High

The curve relating the smallest perceptible intensity of a blue test stimulus with the intensity of an orange conditioning field against which it is viewed shows a characteristic division into low- and high-intensity components, indicating the operation of two mechanisms of cone vision at the fovea. The justification for calling these ‘blue’ and ‘green’ mechanisms is taken from an earlier investigation (Stiles 1939). While most subjects show this division clearly, for some the low-intensity component is masked by the intrusion of rod vision. The correctness of this view is established by measurements made while the eye is recovering from an intense light adaptation. The individual variations of the sensitivities of the ‘green’ and ‘blue’ mechanisms in twenty subjects are assessed. Further evidence is obtained of an anomalously low threshold for the ‘blue’ mechanisms at very high conditioning fields of orange light.

scholarly journals Effect of Passivation Layer on the Thin Film Perovskite Random Lasers

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2322
Author(s):  
Subha Prakash Mallick ◽  
Yu-Heng Hong ◽  
Lih-Ren Chen ◽  
Tsung Sheng Kao ◽  
Tien-Chang Lu
Keyword(s):  
Air Force ◽  
Room Temperature ◽  
High Surface ◽  
Spatial Coherence ◽  
Random Lasing ◽  
Random Lasers ◽  
Scattering Effects ◽  
Low Threshold ◽  
Projection Images ◽  
Multiple Scattering Effects

Novel functionalities of disorder-induced scattering effect in random lasers, attributed to low spatial coherence, draw remarkable attention in high-contrast to superior quality speckle-free imaging applications. This paper demonstrates perovskite-polystyrene (PS)-based random lasing action with robust optical performance at room temperature. Optical characterizations are carried out upon perovskite thin films addition with polystyrene of different mixing concentrations (wt.%). A low threshold lasing operation is achieved with an increasing concentration of polystyrene, accompanying a wavy surface texture with high surface roughness. The rough surface dominating multiple scattering effects leads to enhanced feedback efficiency. Moreover, this study also elucidates efficient fabrication process steps for the development of high quality and durable PS-based random lasers. With the advantages of reduced coherent artifacts and low spatial coherence, speckle free projection images of the USAF (U. S. Air Force MIL-STD-150A standard of 1951) resolution test chart are shown for different PS-based random lasers.

scholarly journals Electrically controllable plasmonic enhanced coherent random lasing from dye-doped nematic liquid crystals containing Au nanoparticles

2016 ◽  
Vol 24 (16) ◽  
pp. 17593 ◽  
Author(s):  
Lei Wang ◽  
Yuan Wan ◽  
Lijie Shi ◽  
Haizheng Zhong ◽  
Luogen Deng
Keyword(s):  
Liquid Crystals ◽  
Au Nanoparticles ◽  
Nematic Liquid Crystals ◽  
Random Lasing
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