Simulation of physical processes in light-emitting diode  pumped lasers

We have developed an end-to-end simulation model for the light-emitting diode-pumped solidstate laser using the Monte Carlo photon tracing technique. The model considers complete specifics and spectral characteristics of light-emitting diodes. This model is the first of its kind to enable comprehensive analysis of light-emitting diode-pumped laser systems to the best of our knowledge. The model revealed several critical implications, which can be considered in the practical realization of light-emitting diode-pumped lasers.

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Effect of color converters on the performance of solar or light-emitting diode pumped solid-state lasers

«Узбекский физический журнал» ◽

10.52304/.v22i5.193 ◽

2020 ◽

Vol 22 (5) ◽

pp. 287-290

Author(s):

A.A. Sherniyozov ◽

Sh.D. Payziyev ◽

G.A. Khalikov ◽

Kh.F. Zikrillayev ◽

S.A. Bakhramov ◽

...

Keyword(s):

Luminescence Intensity ◽

Light Emitting Diode ◽

Potential Candidate ◽

Solid State Lasers ◽

Light Emitting ◽

Frequency Converters ◽

External Frequency ◽

Diode Pumped ◽

Color Converter ◽

Nd:Yag Crystal

The effect of using external frequency converters on the luminescence intensity of an Nd:YAG crystal is studied. The crystal is illuminated by light-emitting diode (LED) with and without Y3Al5O12:Ce3+ material as an external converter. Obtained experimental results show that the luminescence intensity of Nd:YAG crystal increased by 1.5 times when Nd:YAG crystal is illuminated by LED together with color converter based on Y3Al5O12:Ce3+ demonstrating that external frequency converters can be a potential candidate for creating more efficient solar or LED pumped lasers.

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The Intellectual Lighting And Data Transmission System based On RGBW Light Emitting Diodes

Light & Engineering ◽

10.33383/2019-058 ◽

2021 ◽

pp. 63-68

Author(s):

Daniil S. Shiryaev ◽

Olga A. Kozyreva ◽

Ivan S. Polukhin ◽

Sergey A. Shcheglov ◽

Svetlana A. Degtiareva ◽

...

Keyword(s):

Visible Light ◽

Data Transmission ◽

Light Transmission ◽

Transmission Rate ◽

Light Emitting Diode ◽

Spectral Characteristics ◽

System Component ◽

Transmission Channel ◽

Error Vector Magnitude ◽

Light Emitting

The system of intellectual lighting data transmission via visible light is developed and manufactured. Spectral characteristics of a downlink which uses the red crystal of a RGBW light emitting diode for data transfer were studied. The DALI protocol-based radiation chromaticity control system which allows us to set different lighting scenarios with constant data transmission rate was developed. The radiation chromaticity range covers almost the entire colour gamut in the colour space. The system of high-frequency matching of system component impedances was developed and frequency characteristics of the suggested scheme were studied for development of the system. Optimal parameters of the signal for visual light communication such as carrier frequency, modulation type and band were determined. Observation of the constellation diagram which represents different values of the complex amplitude of the keyed signal in the form of a complex number on a quadrature plane (cosine and sine components of the carrying signal) and of fixation of the amplitude of the error vector magnitude (EVM) was selected as a method of study of the transmission channel quality. The value of EVM in the visible light transmission channel was significantly lower for signals with amplitude modulation than for phase-manipulated signals. When implementing different lighting change scenarios, radiation of other crystals of the light emitting diode crystals not used for transmission did not lead to increase of EVM by more than one percent.

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