The transition from incoherent to coherent random laser in defect waveguide based on organic/inorganic hybrid laser dye

Xia, Jiangying; Xie, Kang; Ma, Jiajun; Chen, Xianxian; Li, Yaxin; Wen, Jianxiang; Chen, Jingjing; Zhang, Junxi; Wu, Sha; Cheng, Xinyi; Hu, Zhenjiang

doi:10.1515/nanoph-2018-0034

Cited by 24 publications

(14 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, incoherent processes have been the mechanisms for the random lasers, which explain the broad lasing spectrum in the measurement results shown in Figure 4. The spectral bandwidth of roughly 5 nm or even larger than 7 nm at FWHM has been observed with the incoherent random lasers, as reported in the studies by Xia et al and Weng et al, [ 35,36 ] verifying the random lasing nature of the observed emission spectra.…”

Section: Random Lasing Performancesupporting

confidence: 75%

Threshold Size Effects in the Patterned Crystallization of Hybrid Halide Perovskites for Random Lasing

Wang

Tang

et al. 2021

Advanced Photonics Research

View full text Add to dashboard Cite

A threshold effect in the periodical patterning of the hybrid halide perovskites and a directional output coupling effect in the incoherent random lasing from the patterned materials are reported. Using 1D gratings, the random crystallization process is confined into the grating grooves, producing continuous microstrips of CH3NH3PbBr3 along the groove channels. However, the confinement is strongly dependent on the width of the grating grooves, which can be optimized by tuning the patterning periods. It is thus discovered that the most orderly arranged crystal strips are achieved for a grating period of 10 μm, corresponding to a channel width of about 5 μm, which is the lower limit for the formation of continuous crystal strips. Complicated interfaces inside such randomly organized multicrystals supplied scattering centers for optical gain mechanisms. Thus, incoherent random lasing actions are observed for all of these patterned structures, however, the best lasing performance is achieved for a grating period of 10 μm, which agrees with the highest quality of the crystal strips. The patterned substrate with a 1D grating supplies mechanisms for directional crystallization of hybrid halide perovskites and directional output coupling of random laser emission, enhancing significantly the practical application possibilities of such random lasers.

show abstract

Section: Random Lasing Performancesupporting

confidence: 75%

Threshold Size Effects in the Patterned Crystallization of Hybrid Halide Perovskites for Random Lasing

Wang

Tang

et al. 2021

Advanced Photonics Research

View full text Add to dashboard Cite

show abstract

“…When the optical gain property was further characterized, we observed that the neat film exhibited a remarkably low threshold

E_{th}^{ASE}

, 6.0 µJ cm −2 ) with an exceptional narrow FWHM (2.6 nm) under the vacuum condition (10 −4 Pa), which is similar to the previously reported organic lasers (Figure 1b). [ 12,57–65 ] This deep‐blue ASE emission exhibited a peak at 427 nm, belonging to the 0–1 transition, and the emission can be achieved repeatedly with films spin coated from the toluene solution of MC8‐Th (10 mg mL −1 ). Furthermore, after dispersing MC8‐Th (10 wt%) into inert PS matrix, we achieved a kind of deep‐blue random laser emission (under vacuum condition) with a lower

E_{th}^{ASE}

of 4.1 µJ cm −2 (Figure 1c).…”

Section: Photophysical Properties Of Mc8‐th In Various Statesmentioning

confidence: 96%

Deep‐Blue Thiophene‐Based Steric Oligomers as a Low‐Threshold Laser Gain and Host Material

Han

Bai

et al. 2020

Advanced Optical Materials

View full text Add to dashboard Cite

Thiophene‐based (Th‐based) derivatives have received wide attentions in organic optoelectronics due to their excellent and tuneable optoelectrical properties as well as chemical modification. However, the low photoluminescence quantum yield in solid state limits their application in solution‐processed light‐emitting optoelectronic devices, especially in organic lasers. Herein, a novel blue‐emitting steric Th‐based fluorophore (MC8‐Th) with excellent optical gain behavior for organic laser is reported. Interestingly, MC8‐Th neat film exhibits efficient exceptional deep‐blue amplified spontaneous emission (ASE) behavior with a remarkably low threshold of 6.0 µJ cm−2 and full‐width‐at‐half‐maximum value of 2.6 nm. Furthermore, random laser signals are also obtained with the lowest threshold of 4.1 µJ cm−2 when incorporating the compound into an inert polystyrene (PS) matrix. In addition, low threshold (16 µJ cm−2, fivefold lower than those of F8BT neat films) yellow–green ASE emission (560 nm) is achieved through Förster resonance energy transfer. Meanwhile, ultrafast transient absorption spectroscopy is deployed here to observe the single‐molecular excitonic behavior in solution and PS‐blend, intermolecular excited state in neat film, and efficient energy transfer in MC8‐Th:F8BT‐blend films. As far as known, MC8‐Th shows lower threshold ASE/lasing behavior for the Th‐based conjugated materials.

show abstract

“…Random lasers (RLs) have been the subject of intense research owing to their easy fabrication, low coherence, and small size [8][9][10][11][12][13][14][15][16][17]. The lasing feedback mechanism is synergistically achieved by multiple light scattering, which is different from traditional lasers [18][19][20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Multi-wavelength coherent random laser in bio-microfibers

Xie¹,

Xie²,

Hu³

et al. 2020

Opt. Express

Self Cite

View full text Add to dashboard Cite

In this paper, pure silk protein was extracted from Bombyx mori silks and fabricated into a new kind of disordered bio-microfiber structure using electrospinning technology. Coherent random lasing emission with low threshold was achieved in the silk fibroin fibers. The random lasing emission wavelength can be tuned in the range of 33 nm by controlling the pump location with different scattering strengths. Therefore, the bio-microfiber random lasers can be a wide spectral light source when the system is doped with a gain or energy transfer medium with a large fluorescence emission band. Application of the random lasers of the bio-microfibers as a low-coherence light source in speckle-free imaging had also been studied.

show abstract

The transition from incoherent to coherent random laser in defect waveguide based on organic/inorganic hybrid laser dye

Cited by 24 publications

References 33 publications

Threshold Size Effects in the Patterned Crystallization of Hybrid Halide Perovskites for Random Lasing

Threshold Size Effects in the Patterned Crystallization of Hybrid Halide Perovskites for Random Lasing

Deep‐Blue Thiophene‐Based Steric Oligomers as a Low‐Threshold Laser Gain and Host Material

Multi-wavelength coherent random laser in bio-microfibers

Contact Info

Product

Resources

About