Behaviors of the Rh6G random laser comprising solvents and scatterers with different refractive indices

Jiang, Yi; Feng, Guoying; Yang, Liling; Yao, Ke; Yang, Chao; Song, Yingsong; Zhou, Shouhuan

doi:10.1016/j.optcom.2012.06.094

Cited by 35 publications

(27 citation statements)

References 25 publications

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“…To address the remaining redshift we propose that the polymer undergoes irreversible photoinduced changes, which modify the index mismatch of the system [42] resulting in an increase in scattering. This hypothesis is supported by the observation that increases in the amount of scattering in a material results in the lasing wavelength becoming redshifted [25,[43][44][45]. Later in the paper we will identify several possible candidates for the photoinduced modifications of the polymer host.…”

Section: Figmentioning

confidence: 68%

Photodegradation and self-healing in a Rhodamine 6G dye and $$\hbox {Y}_{2}\hbox {O}_{3}$$ nanoparticle-doped polyurethane random laser

2015

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One of the fundamental difficulties in implementing organic dyes in random lasers is irreversible photodegradation of the dye molecules, leading to loss of performance and the need to replace the dye. We report the observation of self-healing after photodegradation in a Rhodamine 6G dye and nanoparticle doped polyurethane random laser. During irradiation we observe two distinct temporal regions in which the random lasing (RL) emission first increases in intensity and redshifts, followed by further redshifting, spectral broadening, and decay in the emission intensity. After irradiation the emission intensity is found to recover back to its peak value, while still being broadened and redshifted, which leads to the result of an enhancement of the spectrally integrated intensity. We also perform IR-VIS absorbance measurements and find that the results suggest that during irradiation some of the dye molecules form dimers and trimers and that the polymer host is irreversibly damaged by photooxidation and Norrish type I photocleavage.

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Section: Figmentioning

confidence: 68%

Photodegradation and self-healing in a Rhodamine 6G dye and $$\hbox {Y}_{2}\hbox {O}_{3}$$ nanoparticle-doped polyurethane random laser

2015

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“…Since then, random laser behaviors have been extensively studied with a variety of experiments [6][7][8][9][10] and theoretical calculations. [11][12][13] However, most of them are focused on the visible to near-infrared wavelength range.…”

mentioning

confidence: 99%

Random lasing of microporous surface of Cr2+:ZnSe crystal induced by femtosecond laser

et al. 2015

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We demonstrate a random lasing emission based on microporous surface of Cr2+:ZnSe crystal prepared by femtosecond pulsed laser ablation in high vacuum (below 5 × 10−4 Pa). The scanning electron microscope results show that there are a mass of micropores with an average size of ∼13 μm and smaller ones with ∼1.2 μm on the surface of Cr2+:ZnSe crystal. The adjacent micropore spacing of the smaller micropores ranges from 1 μm to 5 μm. Under 1750 nm excitation of Nd:YAG (355 nm) pumped optical parametric oscillator, a random lasing emission with center wavelength of 2350 nm and laser-like threshold of 0.3 mJ/pulse is observed. The emission lifetime of 2350 nm laser reduces from 800 ns to 30 ns as the pump energy increases above threshold. The emission spectra and decay time of smooth surface, groove and microporous surface of Cr2+:ZnSe crystal are contrasted. The optional pump wavelength range is from 1500 nm to 1950 nm, which in accordance with the optical absorption property of Cr2+:ZnSe crystal. The peak position of excitation spectra is almost identical to the strongest absorption wavelength.

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“…4 exhibits the emission spectra as a function of pump energy. Unlike typical lasing action which occurs within carefully configured resonant cavities, random lasers are the simplest sources of simulated emission, occurring without a cavity, with feedback provided by a random scattering media [10][11][12][13] (as described in the lower inset of Fig. 4).…”

Section: Resultsmentioning

confidence: 99%

Unique Growth and Optical Behaviors of Chromium Doped ZnSe Nanoparticles Induced by ns Laser Pulse

Jiang

Feng

Zhang

et al. 2014

Integrated Ferroelectrics

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We have synthesized chromium doped ZnSe nanocrystalline particles (Cr 2+ :ZnSe NCPs) by using nanosecond pulsed laser ablation of polycrystalline Cr 2+ :ZnSe micron-sized powder in liquid environment. The scanning electron micrscope and X-ray diffraction results reveal that the products are ZnSe cubic sphalerite structure with an average size around 60 nm. Based on the Cr 2+ :ZnSe nanoparticles, typical random laser emissions centering at 2175 nm with a threshold of 0.4 mJ/pulse were observed. Compared to the Cr 2+ :ZnSe bulk laser, the central wavelength shows a ∼175 nm blue-shift. The photoluminescence lifetime of Cr 2+ :ZnSe NCPs is shorter than that of Cr 2+ :ZnSe bulk.

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Behaviors of the Rh6G random laser comprising solvents and scatterers with different refractive indices

Cited by 35 publications

References 25 publications

Photodegradation and self-healing in a Rhodamine 6G dye and $$\hbox {Y}_{2}\hbox {O}_{3}$$ nanoparticle-doped polyurethane random laser

Photodegradation and self-healing in a Rhodamine 6G dye and $$\hbox {Y}_{2}\hbox {O}_{3}$$ nanoparticle-doped polyurethane random laser

Random lasing of microporous surface of Cr2+:ZnSe crystal induced by femtosecond laser

Unique Growth and Optical Behaviors of Chromium Doped ZnSe Nanoparticles Induced by ns Laser Pulse

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