Wavelength Variation of a Random Laser with Concentration of a Gain Material

Chen, Shujing; Shi, Jin‐Wei; Zhai, Tianrui; Wang, Zhaona; Liu, Dahe; Xiao, Chen

doi:10.1088/0256-307x/28/10/104204

Cited by 5 publications

(4 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…That is reflected in the redshift of the wavelength. It can be attributed to the reabsorption and emission of unexcited R6G [36] as shown in Fig 2e . The corresponding threshold energy, FWHM, NF, and 𝛽 factor is summarized in the Table 1. One of the important quantitative aspects of a random laser is its NF.…”

Section: Resultsmentioning

confidence: 91%

Random lasing in rhodamine 6G dye - Kaolinite nanoclay colloids under single shot nanosecond pumping

2022

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 91%

Random lasing in rhodamine 6G dye - Kaolinite nanoclay colloids under single shot nanosecond pumping

2022

View full text Add to dashboard Cite

“…Comparing the four cases above, it can be found that the dye concentration not only determines the position of the emission peak [31], but also impacts on the feedback mechanism in random systems with the same scatterer concentration. This is because the gain length l g changes with the dye concentrate, although the mean free path of scattering is unchanged.…”

Section: (H) Region Iii)mentioning

confidence: 98%

Two-threshold silver nanowire-based random laser with different dye concentrations

et al. 2014

View full text Add to dashboard Cite

Unlike conventional lasers with reflective mirrors, random lasers without mirrors rely on the multiple scattering of light in a random system to form an optical feedback mechanism. Therefore they have an important theoretical research value in the field of interaction between light and disorder media and in the field of lasers (i.e. the optical amplifying physical mechanism in a mirrorless system) and have potential applications in displays, sensors and biomedicine [1-5]. Generally, it was considered that there are two feedback mechanisms in random lasers: coherent feedback and incoherent feedback. Incoherent feedback leads to a single or two narrow spectral peaks with a bandwidth of a few nanometers [6-8], while coherent feedback will induce several sharp spectral spikes with subnanometer bandwidth [9][10][11][12][13][14][15][16][17]. Generally, the two kinds of feedback have been investigated in different ways. A random laser with incoherent feedback follows the diffusion equations with gain items [18], while a coherent feedback random laser was treated through combining Maxwell's equations and rate equations [19].The correlation between the two kinds of feedbacks has seldom been noticed. In 2000, Cao et al [20] demonstrated the transition from incoherent feedback to coherent feedback in a strong scattering system by changing the pumping energy for the case with some values of the concentrate of scattering particles. Vardeny et al [21] and Noginov et al [22] observed a similar transition in p-conjugated films, in infiltrated opals and in GaAs random laser, respectively. Liu et al [23] achieved a similar transition for a single random system by changing the pulse width of the pumping lasers. These results reveal that there should be inherent relations between incoherent feedback and coherent feedback and under certain conditions the transition between the two kinds of feedbacks can occur for the single disorder system which will demonstrate two-threshold character. Recently, Lopez [24] demonstrated the difference of an incoherent feedback random laser and a resonance feedback random laser by the correlated property of several of the most intense peaks. The smooth random lasing spectrum with a bandwidth of a few nanometers was attributed to the strong correlation of the resonance feedback induced lasing mode Laser Physics Letters

show abstract

“…Concerning the third characteristic, several strategies have been employed to control the laser threshold, including the use of an appropriate concentration of nanomaterial and dye mixtures, improving the size of the scattering centers and the mean free path, and tuning of the refractive index between the gain and scattering media (Meng et al, 2009;Cerdán et al, 2012;Lin and Hsiao 2014;Tommasi et al, 2016). The fourth characteristic (the intensity of the random laser emission) has also been investigated under the influence of many factors, including the optimization of the selection of the dye and the nanomaterial, the size, and type of the nanomaterial, the concentration of both the dye and the nanomaterial, the pumping power, and the type of source (Lau et al, 2005;Popov et al, 2006;Wiersma 2008;Chen et al, 2011;Yu 2015). Amongst the nanomaterials, nanoparticles (NPs) with superparamagnetic behavior have become interesting because they can be easily controlled under an external magnetic field owing to their extremely low coercive field and high saturation magnetization (Chung and Fu 2011;Brojabasi et al, 2015;Jing et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Dye-Doped Fe3O4 Nanoparticles for Magnetically Controlling Random Laser Parameters at Visible Wavelengths: Literature Review and Experiment

Al-Samak¹,

Jassim²

2022

Indonesian J. Sci. Technol

View full text Add to dashboard Cite

The development of light-controlled electronic devices requires new possibilities of optical control via tuning of laser input parameters. Here, Fe3O4 superparamagnetic nanoparticles (SNPs) were doped with dye, and the controllability of parameters of a random laser, including the wavelength, threshold energy, and intensity under the absence and presence of an external magnetic field was studied. The prepared dye laser (Rh-640) showed strong magnetic controllability and switch ability under different pumping energies (1‒7 mJ), as well as good responsivity and durability at visible wavelengths. The applied magnetic field was utilized to modify the distribution of Fe3O4 SNPs with different concentrations and scattering behavior, altering the generation of coherent loops and laser action properties. Thus, it was possible to employ the magnetically controllable random laser in a variety of technological applications, including biology and optical communications

show abstract

Wavelength Variation of a Random Laser with Concentration of a Gain Material

Cited by 5 publications

References 20 publications

Random lasing in rhodamine 6G dye - Kaolinite nanoclay colloids under single shot nanosecond pumping

Random lasing in rhodamine 6G dye - Kaolinite nanoclay colloids under single shot nanosecond pumping

Two-threshold silver nanowire-based random laser with different dye concentrations

Dye-Doped Fe3O4 Nanoparticles for Magnetically Controlling Random Laser Parameters at Visible Wavelengths: Literature Review and Experiment

Contact Info

Product

Resources

About