Mr. Xiaoying Luo Profile

Xiaoying Luo

at BWT Beijing Ltd

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Publications (2)

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Proceedings Article | 17 March 2023 Poster + Paper

Investigation on the performance of high power long pulse laser diode arrays for hair removal and illumination

Xiaohua Chen, Wei Ma, Linwei Yang, Jieru Li, Xiaoying Luo, Zhenkun Yu, Michael Stoiber, Jens Biesenbach

Proceedings Volume 12402, 124020D (2023) https://doi.org/10.1117/12.2648656

KEYWORDS: Semiconductor lasers, High power lasers, Biomedical applications, Thermal effects, Skin, Light sources and illumination, Laser bars, Laser frequency, Heatsinks, Design and modelling

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By designing a lightweight and compact stacked bar package, we can achieve high-power, high-brightness, and high-stability pulse laser output. The laser diode package consists of eight 1cm high power laser bars, which are bonded between two copper-tungsten heat sinks with AuSn hard solder like a sandwich. These sandwiches are bonded in a second soldering step on a backplane macro-channel cooler. The package structure is very compact and lightweight. We can achieve different frequency, pulse width, duty cycle combinations, which easily allows to adapt to different applications. In this paper, the performance of 808nm and 940nm laser bars is verified under different conditions: The pulse width is varied from 5 to 300ms, and the frequency range is between 1Hz to 10Hz. Resulting duty cycles range from 10% to 40%. In addition this structure can combine two or more wavelengths (808nm and 940nm, 760 and 1060 optional). We achieve 1788W under the condition of 5ms, 10%DC, 200A. This compact and powerful 2D diode laser array with mixed wavelengths is very suitable for laser hair removal. It can not only fully act on the melanin of the hair follicle, but also coagulate the micro vessels around the hair follicle to cut off the blood supply of the hair follicle. With the right combination of wavelength, the penetration depth and absorbtion characteristics can be tailored to the different skin types from white to dark skin, avoiding skin irritation and pain. For pulsed pumping applications or far field illumination, FAC lenses can be applied to allow for best beam brightness. The package can be designed from single bar to 12 bars, depending of the power demand for the individual applications. Dense packaging of more than one stack in one laser unit allows high application power of multiple kW in a compact handpiece design for hair removal.

Proceedings Article | 5 March 2021 Presentation + Paper

Thermal characteristics analysis of high power 808nm bar facial array

Xiaohua Chen, Xiaoying Luo, Zhenkun Yu, Jiangyun Wang, Rong Chen, Linwei Yang, Ruixue Chen, Lin Geng

Proceedings Volume 11667, 116670A (2021) https://doi.org/10.1117/12.2578379

KEYWORDS: Thermodynamics, Optical fibers, Near field

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In order to optimize the output parameters of 808nm array of high-power microchannel heat sink package, the fluid thermodynamic characteristics of 50 × 10 array were simulated. The thermal distribution of the simulation results was used to guide the array assembly. The spectral characteristics of each bar in the stacked array were observed by near-field fiber scanning probe. The simulation results show that the flow rate of the stacked bar decreases gradually from bottom to top, the temperature of the bar increases gradually, and the flow rate of each stacked bar decreases slowly as it is far away from the water outlet. When the flow rate at the entrance of the stack array is 10 L/min, the temperature difference between the bottom and top bar of a single stack array is 13.1 °C, the flow rate difference is 0.24 L/min, and the FWHM width of the stack array spectrum can reach 4.5nm. The temperature of the active region is calculated by measuring the wavelength shift of each bar in a single stacked array, and the results are consistent with the simulation results. The spectral characteristics of the array can be effectively improved by assembling the array according to the temperature distribution.

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