Study on the Polarization of Random Lasers from Dye-Doped Nematic Liquid Crystals

Ye, Lihua; Zhao, Chong; Yang, Feng; Gu, Bing; Cui, Yiping; Lu, Yan‐qing

doi:10.1186/s11671-016-1778-x

Cited by 32 publications

(18 citation statements)

References 38 publications

(40 reference statements)

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“…Glass microscope cover slides 160 µm thick were glued orthogonally to z in order to seal the cell and so define input and output facets. These extra interfaces prevented the formation of NLC menisci and uncontrolled light depolarization; they were also coated with polyimide and rubbed along y to optimize the coupling of y -polarized electric fields to extraordinary waves in the NLC 37 . A mixture of commercial E7 (Merck) and 0.3 wt% Pyrromethene 597 dye (Exciton) was introduced to fill the cell by capillary action.…”

Section: Methodsmentioning

confidence: 99%

Beaming random lasers with soliton control

et al. 2018

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Random lasers are resonator-less light sources where feedback stems from recurrent scattering at the expense of spatial profile and directionality. Suitably-doped nematic liquid crystals can random lase when optically pumped near resonance(s); moreover, through molecular reorientation within the transparency region, they support self-guided optical spatial solitons, i.e., light-induced waveguides. Here, we synergistically combine solitons and collinear pumping in weakly scattering dye-doped nematic liquid crystals, whereby random lasing and self-confinement concur to beaming the emission, with several improved features: all-optical switching driven by a low-power input, laser directionality and smooth output profile with high-conversion efficiency, externally controlled angular steering. Such effects make soliton-assisted random lasers an outstanding route towards application-oriented random lasers.

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Section: Methodsmentioning

confidence: 99%

Beaming random lasers with soliton control

et al. 2018

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“…The NIR beam formed a nematicon, whereas the visible pump provided gain by populating the laser levels of the guest-host. The generated fluorescence, as well as the amplified spontaneous and random laser emissions, were extraordinary-waves [14], [23], [29] and, therefore, could be confined within the spatial soliton and propagate as guided-waves along the 2 mm long cell. Fluorescence and laser emission, as well as the soliton beam could be imaged versus propagation by means of the photons scattered out of the plane yz, and also at the sample output, using high-resolution cameras.…”

Section: Methodsmentioning

confidence: 99%

Near-Infrared Switching of Light-Guided Random Laser

2018

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We report on all-optical modulation and switching of light-guided random laser emission in optically pumped dye-doped nematic liquid crystals, whereby a continuouswave near-infrared beam at 1.064 μm, nonresonant with the medium and collinear with the pump source, forms a reorientational spatial soliton. Such soliton-assisted cavity-less laser exhibits a beam character with directional emission and smooth transverse profile and can be either switched-ON or made more efficient by injecting a weak input. We achieve energy amplifications of laser emission in excess of 18 dB by injecting a 6 mW near-infrared beam.

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“…Recently, WGM resonance has been widely used to enhance the sensitivity of gas sensors, such as for detecting carbon dioxide and water [2][3][4][5][6][7][8][9]. WGM enhanced lasing has been observed in some materials and circular structures [10][11][12][13][14][15][16][17][18]. It has been reported that random lasings (RLs) are generated by WGM resonance in disordered systems.…”

Section: Introductionmentioning

confidence: 99%

Whispering-Gallery-Mode for Coherent Random Lasing in a Dye-Doped Polystyrene Encapsulated Silica-Glass Capillary

et al. 2020

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Dye-doped polystyrene (DDPS) encapsulated in a silica-glass capillary with a diameter of 300 μm was fabricated through radical polymerization of styrene within the capillary. The coherent random lasing (RL) with full width at half maximum (FWHM) of 0.36 nm and a quality factor of 1608 was produced in the DDPS with the capillary when pumping at 532 nm. However, the incoherent RL with FWHM of 6.62 nm and a quality factor of 92 was produced in the DDPS without the capillary. A detailed investigation on this phenomenon by changing the diameter of the capillary and core refractive index (RI) reveals that there exists a strong whispering gallery mode (WGM) resonance in the capillary, which helps generate the coherent RL. The findings may open up a new approach for the fabrication of highly efficient photonic devices.

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Study on the Polarization of Random Lasers from Dye-Doped Nematic Liquid Crystals

Cited by 32 publications

References 38 publications

Beaming random lasers with soliton control

Beaming random lasers with soliton control

Near-Infrared Switching of Light-Guided Random Laser

Whispering-Gallery-Mode for Coherent Random Lasing in a Dye-Doped Polystyrene Encapsulated Silica-Glass Capillary

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