Analysis of organic luminescent dye aggregation forms embedded in cyclodextrins via random lasing

Janeczko, Martyna; Cyprych, Konrad; Koźbiał, Małgorzata; Myśliwiec, Jarosław

doi:10.1016/j.orgel.2020.105888

Cited by 6 publications

(2 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because of that, to compare the RL (600 nm) with the fluorescence in order to analyze the gain clamping, we select the intensity at 585 nm, which is close to the RL peak (600 nm), and thus expected to be clamped by the RL transition. To avoid any hidden contribution to the fluorescence analyses from molecular aggregates and reabsorption/reemission effects, which are known to redshift the RL wavelength [30,52,53], we selected the fluorescent emission at 585 nm whose wavelength is shorter than the RL peak.…”

Section: Experimental Results For Rhodamine 6g and Tio 2 Nanoparticle...mentioning

confidence: 99%

Gain clamping in random lasers

Santos¹,

Silva²,

Silva³

et al. 2021

Laser Phys. Lett.

View full text Add to dashboard Cite

Random lasers (RLs) rely on obtaining laser emission in disordered systems with gain. The characterization of the RLs are performed by the observations of bandwidth narrowing, increasing in the slope efficiency, time shortening of the upper level of the RL transition, intensity and spectral fluctuations, and even photon statistics transitions when increasing the optical gain. However, the gain clamping, which is a known phenomenon in conventional lasers, i.e. lasers with well-defined cavity, was never investigated in RLs. Here we realize an experimental-theoretical investigation of the gain clamping in RLs, and demonstrate that it can be used as an alternative tool to characterize the transition from spontaneous emission to the RL regime.

show abstract

Section: Experimental Results For Rhodamine 6g and Tio 2 Nanoparticle...mentioning

confidence: 99%

Gain clamping in random lasers

Santos¹,

Silva²,

Silva³

et al. 2021

Laser Phys. Lett.

View full text Add to dashboard Cite

show abstract

“…RL measurements were carried out in an experimental setup comprising the following optical devices and elements: a nanosecond Nd:YAG laser Surelite II (Continuum Lasers, San Jose, California, CA, USA) generating a laser light of wavelength equal to 355 nm (third harmonic) with a repetition rate of 10 Hz, pulse duration 5 ns, and energy in pulse 156 mJ, the Horizon I (Continuum Lasers, San Jose, California, CA, USA) optical parametric oscillator (OPO) capable of tuning the laser light wavelength between 192 and 2750 nm in the parametric three-wave mixing process, and the optical system consisting of an achromatic half-wave plate, achromatic Glan laser polarizer, afocal system made of two convex lenses with magnification 5×, adjustable slit, and a cylindrical lens. The laser light from OPO was used to excite polymeric samples; it was adjusted to the wavelength of 535 nm to match the absorption band of rhodamine 6g laser dye [ 42 ]. According to the Malus law principle, a half-wave plate and the Glan laser polarizer were used to control the incident beam energy.…”

Section: Methodsmentioning

confidence: 99%

Tailoring the Random Lasing Properties by Controlled Phase Separation Process in PMMA:PVK Dye-Doped Polymeric Blends

Cyprych

Sznitko

2021

Polymers

Self Cite

View full text Add to dashboard Cite

This article describes the random lasing (RL) phenomenon obtained in a dye-doped, polymeric double-phase system composed of PMMA and PVK polymers. It shows how relative concentrations between mentioned macromolecules can influence lasing parameters of the resulting blends, including obtained emission spectra and threshold conditions. We describe the influence of lasers’ composition on their morphologies and link them with particular RL properties. Our studies reveal that the disorder caused by phase separation can support the RL phenomenon both in the waveguiding and quasi-waveguiding regimes. Changing the relative concentration of polymers enables one to switch between both regimes, which significantly influences threshold conditions, spectral shift, number of lasing modes, and ability to support extended and/or localized modes. Finally, we show that a simple phase separation technique can be used to fabricate efficient materials for RL. Moreover, it enables the tailoring of lasing properties of materials in a relatively wide range at the stage of the laser material fabrication process in a simple way. Therefore, this technique can be seen as a fast, cheap, and easy to perform way of random lasers fabrication.

show abstract