Linearly polarized emission from random lasers with anisotropically amplifying media

Knitter, Sebastian; Kues, Michael; Haidl, Michael; Fallnich, Carsten

doi:10.1364/oe.21.031591

Cited by 9 publications

(6 citation statements)

References 33 publications

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“…In Figure e, almost all lasing modes are not polarized even with the linearly polarized excitation. Random lasing modes in the strongly scattering regime are known to not be polarization-sensitive, because strong scattering in dye molecules randomizes or scrambles the polarization . On the other hand, we find some bimodal lasing peaks from necklace states are relatively polarization-sensitive.…”

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confidence: 62%

“…Random lasing modes in the strongly scattering regime are known to not be polarization-sensitive, because strong scattering in dye molecules randomizes or scrambles the polarization. 30 On the other hand, we find some bimodal lasing peaks from necklace states are relatively polarization-sensitive. Overall, although the lasing interactions and their polarization states have easily detectable spectral features, it is difficult to resolve the exact spectral profile of necklace states in passive systems due to the limited spectral resolution.…”

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confidence: 72%

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Lasing Interactions Disclose Hidden Modes of Necklace States in the Anderson Localized Regime

2017

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Anderson light localization is known to be minimally affected by nonlinearity (e.g., gain), as a lasing mode typically arises from an isolated localized mode in a passive system. However, in the Anderson localized regime of lowdimensional systems, local resonances can occasionally experience strong level overlap and form an asymmetric single line, which is also known as necklace states. This case is not a hypothetically rare event and indeed is not uncommon. For such passive transport, we experimentally and theoretically investigate how nonlinearity affects necklace states in multilayered systems. When gain or amplifying media are introduced in a system, an asymmetric line splits into multiple lasing peaks, interacting with one another. By decomposing field spectra into a sum of Lorentzian lines, we find that diverging lasing peaks arise from quasimodes; in turn the lifetime and degree of level overlap of the underlying quasimodes are strongly attributed to the threshold and spectral behavior of the emerging lasing modes. These results suggest that observation of lasing interactions could be an alternative yet powerful tool for investigating necklace states (or hybridized states of coupled resonances), the existence of which is challenging to experimentally prove and study, due to grossly single-appearing spectral peaks in passive systems.

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confidence: 62%

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confidence: 72%

Lasing Interactions Disclose Hidden Modes of Necklace States in the Anderson Localized Regime

2017

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“…We compared our SkelCL based implementation to a handwritten, fine-tuned OpenCL implementation which is based on [12]. The OpenCL version is specifically designed for modern Nvidia GPUs.…”

Section: Gaussian Blur Using Multiple Gpusmentioning

confidence: 99%

High-Level Programming of Stencil Computations on Multi-GPU Systems Using the SkelCL Library

Steuwer

Haidl

Breuer

et al. 2014

Parallel Process. Lett.

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The implementation of stencil computations on modern, massively parallel systems with GPUs and other accelerators currently relies on manually-tuned coding using low-level approaches like OpenCL and CUDA. This makes development of stencil applications a complex, time-consuming, and error-prone task. We describe how stencil computations can be programmed in our SkelCL approach that combines high-level programming abstractions with competitive performance on multi-GPU systems. SkelCL extends the OpenCL standard by three high-level features: 1) pre-implemented parallel patterns (a.k.a. skeletons); 2) container data types for vectors and matrices; 3) automatic data (re)distribution mechanism. We introduce two new SkelCL skeletons which specifically target stencil computations -MapOverlap and Stencil -and we describe their use for particular application examples, discuss their efficient parallel implementation, and report experimental results on systems with multiple GPUs. Our evaluation of three real-world applications shows that stencil code written with SkelCL is considerably shorter and offers competitive performance to hand-tuned OpenCL code.Electronic version of an article published as Parallel

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“…These lasers have unique intrinsic properties such as simple structure and large angular emission without the need for external cavities (Ejbarah et al, 2020). Therefore, great efforts have been devoted to realizing random lasers in different materials with a wide wavelength range from ultraviolet to mid-infrared and the terahertz frequency (Knitter et al, 2013). Nevertheless, the mechanism of controlling the direction of the random laser emission has remained the biggest challenge for researchers in this field.…”

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

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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

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Linearly polarized emission from random lasers with anisotropically amplifying media

Cited by 9 publications

References 33 publications

Lasing Interactions Disclose Hidden Modes of Necklace States in the Anderson Localized Regime

Lasing Interactions Disclose Hidden Modes of Necklace States in the Anderson Localized Regime

High-Level Programming of Stencil Computations on Multi-GPU Systems Using the SkelCL Library

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

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