Emission polarization of random lasers in organic dye solutions

Abstract

This Letter presents a polarimetric study of the emission of random lasers from organic dyes. Coherent lasing modes from samples with ethanol solvent showed a high degree of polarization and did not influence each other in polarization. The proper choice of a laser dye with asymmetric absorption momenta, a highly viscous solvent, and a linear pump polarization can cause the random lasing emission to be completely linearly polarized for all wavelengths within the amplification range.

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

“…At the same year, Gottardo et al used extremely anisotropic scattering from small droplets of liquid crystals to create and manipulate polarized random laser emission [21]. In 2012, it was found that random lasers in organic dye solutions can be linearly polarized using the anisotropic adsorption of the dye molecules [22]. In [23], random laser emitted from DDNLCs was investigated, and any arbitrary linear polarization of RLs can be obtained by rotating the nematic liquid crystal sample.…”

The controllable intensity and polarization degree of random laser from sheared dye-doped polymer-dispersed liquid crystal

“…When the shear distance is 0 mm, the DOP is 0.1. The direction of dye's transition dipole moments is randomly distributed, thus only a small fraction of the overall emission could be polarimetrically evaluated [18].…”

“…As the liquid crystal droplets are gradually oriented in the shear direction, the scattering intensity is gradually reduced in perpendicular direction. The controllable intensity and polarization degree of random laser by shearing the DDPDLC have prospects of wide range of applications, such as optical sensors as a laser light source [29] and liquid crystal display [18].…”

“…The linear polarization of random laser has been realized in liquid-crystal-based media [17] and in suspensions of scattering nanoparticles source [18]. The polarized character of random lasing in dye-doped nematic liquid crystals has been addressed [18,19]. The DOP can be adjusted to some extent by varying the material composition of the laser [20] or by adjusting the pump light [21].…”

Lévy Statistics and Glassy Behavior of Light in Random Fiber Lasers

“…That report was followed by a great number of papers from different authors that investigated on other physical systems for efficient RL operation. A large variety of materials has been tested in the past years, and recent publications on RLs describe, for example, experiments with dyes dissolved in transparent liquids, gels or liquid crystals with suspended micro or nanoparticles as light scatterers [12][13][14][15][16][17], powders of semiconductor quantum dots [18,19], dielectric nanocrystals doped with rare-earth ions [20,21], polymers and organic membranes doped by luminescent molecules [22][23][24][25][26][27], semiconductor and metallic nanowires structures [28][29][30][31], and even atomic vapors that present analogies with astrophysical lasers [32].…”