Octave-wide supercontinuum generation of light-carrying orbital angular momentum

Prabhakar, Gautam; Gregg, Patrick; Rishøj, Lars Søgaard; Kristensen, Poul; Ramachandran, Siddharth

doi:10.1364/oe.27.011547

Cited by 58 publications

(31 citation statements)

References 28 publications

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“…This part introduces and illustrates the numerical model of the transmitted blue light and converted yellow light in the double-layer phosphor structure, from which changes can be made to create immense enhancement to LED efficiency. The blue light transmission and the conversion of yellow light in single layer remote phosphor package with the phosphor layer thickness of 2h expressed as ( 1) and ( 2) [21][22][23][24][25][26].…”

Section: Resultsmentioning

confidence: 99%

“…In addition, by applying the Mie theory, the scattering cross section Csca for spherical particles can be calculated with the following expression. The transmitted light power can be measured by the Lambert-Beer law [22] as shown in (6). In which I0 is the incident light power, L is the thickness of phosphor layer (mm) and µext is the extinction coefficient, which can be expressed as: µext = Nr.Cext, where Nr is as the number density distribution of particles (mm -3 ).…”

Section: Resultsmentioning

confidence: 99%

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MgCeAl11O19:Tb3+ and Mg8Ge2O11F2:Mn4+ in enhancing the color quality of remote phosphor LED

Thi

That

2021

TELKOMNIKA

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As the name infers, the triple-layer remote phosphor (TRP) has 3 phosphor layers includes the red Mg8Ge2O11F2:Mn 4+ phosphor layer on the top, the green MgCeAl11O19:Tb 3+ phosphor layer in the middle, and the yellow YAG:Ce 3+ layer at the bottom and is mentioned as a solution to increase the chromaticity and luminescence adequacy of the white LEDs (WLEDs) in this article. As to control the red light for higher value achieve in the color rendering index (CRI), using red Mg8Ge2O11F2:Mn 4+ phosphor in the TRP structure is recommended. All the outcomes indicate that when red phosphor Mg8Ge2O11F2:Mn 4+ concentration grows the CRI gets higher values, and drastically declines when the concentration of green phosphor MgCeAl11O19:Tb 3+ increases. As the same time, applying the green MgCeAl11O19:Tb 3+ phosphor layer to manage the green light as it can make the luminous efficacy (LE) of WLEDs increase. In particular, the index of LE can also be improved over 40% by limiting the scatter of light and putting in green light. Moreover, to preserve the average correlated color temperature (ACCT) stable at 8500K, the yellow YAG:Ce 3+ concentration must be cut down as the concentration of red and green phosphor rise.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

MgCeAl11O19:Tb3+ and Mg8Ge2O11F2:Mn4+ in enhancing the color quality of remote phosphor LED

Thi

That

2021

TELKOMNIKA

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“…Others try to achieve enhanced emitted light through LEDs alteration with the reflector [10]. The mechanism of structures that employ remote phosphor as optical properties enhancer is presented in a few notable research [11][12][13]. A study attempted to boost the lighting capacity with inner reflection enhancing setup that requires half a spherical shell lens made of polymer and a layer of phosphor dispersed inside [14].…”

Section: Introductionmentioning

confidence: 99%

Using flat phosphor layer in dual-layer remote phosphor configuration to improve luminous efficacy

Thi

That

2021

TELKOMNIKA

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The phosphor layer shape and components distances are the subjects proposed to advance the quality of WLEDs in this article. The two distances, between phosphor layers (d1) and between the phosphor layer and the LED chip (d2) in Flat dual-remote phosphor (FDRP) and Concave dual-remote phosphor (CDRP) were examined by experiments to determine their impacts on WLEDs lighting performances. The results suggest that FDRP is a better option than CDRP for lighting performance. In each respective structure, the distances influence the lighting capacity and color output whenever they fluctuate. Therefore, to effectively control and study this phenomenon, the correlated color temperature is maintained at 8500 K, and the concentration of phosphor material is altered while the distances are changing. When d1 and d2 are at the starting value of 0, the recorded lumen output and chromatic performance of lighting devices are the lowest and begin to increase as d1 and d2 expand. Bigger d1 and d2 mean bigger scattering area and better chromatic light integration, which leads to higher color quality. Detailed results present that optimal values of d1 or d2 for the highest lumen output of 1020 lm are 0.08 mm or 0.63 mm, respectively. Meanwhile the lowest color deviation is accomplished with d1=0.64 mm or d2=1.35 mm.

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“…A recent study proposed the SC generation of OAM beam (l=1) spanning from 696 to 1058nm at −20 dB using an annular core photonic crystal fiber (PCF) [12]. A SC generation carrying the high-order (l=8) OAM beam was also experimentally demonstrated in the near-infrared spectrum based on air-core ring fiber [13]. In practical application, high-order OAM modes could be used to reach higher data transmission capacity though mode division multiplexing (MDM) in an all-fiber optical communication system.…”

Section: Introductionmentioning

confidence: 99%

Two-Octave Supercontinuum Generation of High-Order OAM Modes in Air-Core As₂S₃ Ring Fiber

et al. 2020

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In this work, we design and simulate an air-core As2S3 ring fiber for high-order orbital angular momentum (OAM) supercontinuum generation. We show that the chromatic dispersion of the ring fiber can be substantially tailored by proper optimization of the air-core radius. Two-octave supercontinuum carrying OAM17,1 mode, spanning from 1560 to 6250 nm, is obtained by pumping a 50-fs 100-kW secant hyperbolic pulse centered at the wavelength of 3800 nm into the designed fiber with 50-μm air-core radius and 1-μm ring width. We further engineer the chromatic dispersion of some other OAM modes and perform simulations of supercontinuum spectra using different kilowatt-level peak power, which indicates that the fiber we design represents a promising avenue for supercontinuum generation of all the OAMl,1 modes (|l|≤17). The proposed fiber is suitable for the transmission of OAM beams in infrared wavelength range and it could promote the development and application of high-order OAM beams.

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Octave-wide supercontinuum generation of light-carrying orbital angular momentum

Cited by 58 publications

References 28 publications

MgCeAl11O19:Tb3+ and Mg8Ge2O11F2:Mn4+ in enhancing the color quality of remote phosphor LED

MgCeAl11O19:Tb3+ and Mg8Ge2O11F2:Mn4+ in enhancing the color quality of remote phosphor LED

Using flat phosphor layer in dual-layer remote phosphor configuration to improve luminous efficacy

Two-Octave Supercontinuum Generation of High-Order OAM Modes in Air-Core As₂S₃ Ring Fiber

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