scholarly journals Random Lasers: Multicolor Ultralow-Threshold Random Laser Assisted by Vertical-Graphene Network (Advanced Optical Materials 16/2018)

2018 ◽  
Vol 6 (16) ◽  
pp. 1870063
Author(s):  
Pradip Kumar Roy ◽  
Golam Haider ◽  
Hung-I Lin ◽  
Yu-Ming Liao ◽  
Cheng-Hsin Lu ◽  
...  
Keyword(s):  
Optical Materials ◽  
Random Laser ◽  
Random Lasers

A curvature-tunable random laser

Nanoscale ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 3534-3545 ◽  
Author(s):  
Ya-Ju Lee ◽  
Ting-Wei Yeh ◽  
Zu-Po Yang ◽  
Yung-Chi Yao ◽  
Chen-Yu Chang ◽  
...  
Keyword(s):  
Free Path ◽  
Mean Free Path ◽  
Random Laser ◽  
Experimental Demonstration ◽  
Random Lasers

We report the first experimental demonstration of curvature-tunable random lasers to control the transport mean free path of emitted photons.

Flexible random lasers with tunable lasing emissions

Nanoscale ◽  
2018 ◽  
Vol 10 (22) ◽  
pp. 10403-10411 ◽  
Author(s):  
Ya-Ju Lee ◽  
Chun-Yang Chou ◽  
Zu-Po Yang ◽  
Thi Bich Hanh Nguyen ◽  
Yung-Chi Yao ◽  
...  
Keyword(s):  
Polyethylene Terephthalate ◽  
Random Laser ◽  
Random Lasers ◽  
High Degree ◽  
Pet Substrate

In this study, we experimentally demonstrated a flexible random laser fabricated on a polyethylene terephthalate (PET) substrate with a high degree of tunability in lasing emissions.

scholarly journals Flexible Random Laser Using Silver Nanoflowers

Polymers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 619 ◽  
Author(s):  
Junhua Tong ◽  
Songtao Li ◽  
Chao Chen ◽  
Yulan Fu ◽  
Fengzhao Cao ◽  
...  
Keyword(s):  
High Efficiency ◽  
Flexible Substrate ◽  
Field Enhancement ◽  
Random Laser ◽  
Lasing Wavelength ◽  
Random Lasers ◽  
Phase Synthesis ◽  
Polymer Waveguide ◽  
Solution Phase Synthesis ◽  
Low Threshold

A random laser was achieved in a polymer membrane with silver nanoflowers on a flexible substrate. The strong confinement of the polymer waveguide and the localized field enhancement of silver nanoflowers were essential for the low-threshold random lasing action. The lasing wavelength can be tuned by bending the flexible substrate. The solution phase synthesis of the silver nanoflowers enables easy realization of this type of random lasers. The flexible and high-efficiency random lasers provide favorable factors for the development of imaging and sensing devices.

scholarly journals A random laser based on electrospun polymeric composite nanofibers with dual-size distribution

2019 ◽  
Vol 1 (2) ◽  
pp. 728-734 ◽  
Author(s):  
Mário César Albuquerque de Oliveira ◽  
Leonardo de Souza Menezes ◽  
Pablo I. R. Pincheira ◽  
Carlos Rojas-Ulloa ◽  
Nikifor Rakov Gomez ◽  
...  
Keyword(s):  
Composite Nanofibers ◽  
Electrospun Fiber ◽  
Polymeric Composite ◽  
Essential Elements ◽  
Random Laser ◽  
Flexible Systems ◽  
Broad Distribution ◽  
Environment Friendly ◽  
Random Lasers ◽  
Lasing Mechanism

Electrospun fiber-based random lasers are environment-friendly flexible systems in which waveguiding/scattering processes provided by their structure with a broad distribution of diameters are essential elements to generate a suitable lasing mechanism.

scholarly journals Coherent Förster resonance energy transfer: A new paradigm for electrically driven quantum dot random lasers

2020 ◽  
Vol 6 (41) ◽  
pp. eaba1705 ◽  
Author(s):  
Tien-Lin Shen ◽  
Han-Wen Hu ◽  
Wei-Ju Lin ◽  
Yu-Ming Liao ◽  
Tzu-Pei Chen ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Quantum Dot ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Forster Resonance Energy Transfer ◽  
Förster Resonance Energy Transfer ◽  
Random Laser ◽  
Random Lasers ◽  
Electrically Pumped ◽  
Förster Resonance

The many distinct advantages of random lasers focused efforts on developing a breakthrough from optical pumping to electrical pumping. However, progress in these is limited due to high optical loss and low gain. In this work, we demonstrate an electrically pumped quantum dot (QD) random laser with visible emission based on a previously unexplored paradigm named coherent Förster resonance energy transfer (CFRET). In the CFRET process, when a coherent photonic mode is formed because of multiple scattering of the emitted light traveling in mixed donor and acceptor QDs, the donor QDs not only serve as scattering centers but are also enable coherent energy transfer to acceptor QDs. Therefore, the laser action can be easily achieved, and the lasing threshold is greatly reduced. Our approach of electrically pumped QD-based random lasers represents a substantial step toward a full-spectrum random laser for practical applications.

PARTIALLY PUMPED RANDOM LASERS

2014 ◽  
Vol 28 (05) ◽  
pp. 1430001 ◽  
Author(s):  
JONATHAN ANDREASEN ◽  
NICOLAS BACHELARD ◽  
SHIVAKIRAN B. N. BHAKTHA ◽  
HUI CAO ◽  
PATRICK SEBBAH ◽  
...  
Keyword(s):  
Laser Cavity ◽  
Laser Output ◽  
Mode Interaction ◽  
Experimental Investigations ◽  
Random Laser ◽  
Difficult Case ◽  
Scattering Medium ◽  
Random Lasers ◽  
Gain Material ◽  
The Impact

Conventional lasers consist of two components: a gain material that is pumped in order to provide amplification of light and a cavity to provide feedback. Random lasers replace the traditional laser cavity with a random, multiple-scattering medium. This can give rise to complex lasing behavior, such as unpredictable multidirectional and multifrequency output. Controlling these systems has proved difficult and, until now, has consisted of material and structural manipulations. In random lasers, the most common pumping mechanism is an optical field, which can be applied uniformly or partially across the scattering medium. Partial pumping, referring to the restricted spatial extent of the pump applied to the gain material, is therefore quite ubiquitous in such systems. In contrast to conventional lasers, however, the impact of partial pumping can be significant in random lasers as a subset of the scattering medium is probed. In this review, we discuss state-of-the-art investigations of partially pumped random lasers. Numerical and experimental investigations of how even a simple spot profile of the pump can dramatically alter random laser output are presented. First, the simple case of partial pumping in strongly scattering systems where laser modes are spatially confined is described. Then the most common but more difficult case of weakly scattering random lasers is considered. Here, modes are spatially extended, forcing greater mode interaction and making the random laser output more difficult to predict. Finally, we review recent works that show how the pumping degree of freedom allows a general increase in control over random lasers.

scholarly journals Resonant energy transfer and light scattering enhancement of plasmonic random lasers embedded with silver nanoplates

RSC Advances ◽  
2020 ◽  
Vol 10 (13) ◽  
pp. 7551-7558 ◽  
Author(s):  
Jia-Huei Hsiao ◽  
Shih-Wen Chen ◽  
Bing-Yi Hung ◽  
Kasimayan Uma ◽  
Wei-Cheng Chen ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Light Scattering ◽  
Random Laser ◽  
Transfer Enhancement ◽  
Random Lasers ◽  
Resonant Energy ◽  
Silver Nanoplates ◽  
Resonant Energy Transfer

The resonant energy transfer enhancement from a plasmonic random laser has been investigated by means of a dye-covered PVA film embedded with silver nanoplates with different sizes and morphologies.

scholarly journals Coherent Random Lasing Realized in Polymer Vesicles

2019 ◽  
Vol 10 (3) ◽  
pp. 254-264
Author(s):  
Yaxin Li ◽  
Kang Xie ◽  
Xiaojuan Zhang ◽  
Zhijia Hu ◽  
Jiajun Ma ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Polymer Concentration ◽  
Water System ◽  
Random Laser ◽  
Random Lasing ◽  
Random Lasers ◽  
Polymer Vesicles ◽  
Azobenzene Polymer ◽  
The Fourier Transform ◽  
Small Size Group

AbstractWe have demonstrated the realization of a coherent vesicle random lasing (VRL) from the dye doped azobenzene polymer vesicles self-assembled in the tetrahydrofuran-water system, which contains a double-walled structure: a hydrophilic and hydrophobic part. The effect of the dye and azobenzene polymer concentration on the threshold of random laser has been researched. The threshold of random laser decreases with an increase in the concentration of the pyrromethene 597 (PM597) laser and azobenzene polymer. Moreover, the scattering of small size group vesicles is attributed to providing a loop to boost the coherent random laser through the Fourier transform analysis. Due to the vesicles having the similar structure with the cell, the generation of coherent random lasers from vesicles expand random lasers to the biomedicine filed.

Wavelength Tunable Random Laser

2005 ◽  
Vol 106 ◽  
pp. 87-92 ◽  
Author(s):  
E. Tikhonov ◽  
Vasil P. Yashchuk ◽  
O. Prygodjuk ◽  
V. Bezrodny
Keyword(s):  
Pump Beam ◽  
Rhodamine 6G ◽  
Formation Mechanisms ◽  
Random Laser ◽  
Medium Thickness ◽  
Band Shift ◽  
Random Lasers ◽  
Tuning Method ◽  
Beam Parameters ◽  
Different Thickness

Continuously tunable random laser basing on rhodamine 6G was achieved. Wavelength tuning was implemented by wedge-shaped sample shift relatively to the pump beam. The physical base of the tuning method is gain band shift caused by reabsorption. We ascertained that two medium thickness ranges of significantly different tune efficiency exist. The lasing characteristics of the laser were investigated depending on active medium and pump beam parameters. The feedback formation mechanisms in the random lasers of different thickness were analyzed.

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