Temperature distribution and thermal resistance analysis of high-power laser diode arrays

Deng, Z. Y.; Shen, Jun; Gong, Wenchi; Dai, Wei; Gong, Maoqiong

doi:10.1016/j.ijheatmasstransfer.2019.01.022

Cited by 16 publications

(9 citation statements)

References 28 publications

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“…Since the color-tuning capability is the main focus of this work rather than the power and efficiency investigation, a relatively low injection current was selected to avoid the potential issues brought by the phosphor selfheating and the thermal accumulation inside the P-N junction of the LD. [54][55][56] The illuminations are compared before and after the tribo-charging, with the photographs shown in Figure 4a,b. To achieve the highest color variation, a 4700 pF external capacitor was connected and the RFS-TENG rotation speed was set at 300 rpm.…”

Section: Resultsmentioning

confidence: 99%

Tribo‐Induced Color Tuner toward Smart Lighting and Self‐Powered Wireless Sensing

Wang

Yin

et al. 2021

Advanced Science

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The color‐tuning capability of solid‐state lighting (SSL) systems are highly demanded for smart lighting according to the environmental conditions, as well as wireless sensing of the environmental information. In the meanwhile, state‐of‐the‐art triboelectric nanogenerator (TENG)‐based sensing systems rely on bulky and expensive devices, which require cable connections and additional power consumptions. This work aims at solving these challenges, through developing a tribo‐induced color tuner that can be integrated into the vastly distributed commercial SSL system. This tribo‐induced color tuner includes a concentric color conversion plate consisting of (Sr,Ca)AlSiN3:Eu phosphor and TiO2, a tribo‐induced liquid lens, and a rotary freestanding sliding TENG. The color oscillation between purple and pink is achieved upon the tribo‐charging by the TENG, which reveals the input mechanical motion signals. The signal can be conveniently sent by everywhere‐existed lamps and processed by everyone‐owned smartphone cameras or closed‐circuit televisions. Through this approach, the function of wireless sensing is achieved without the need of preamplification, with no additional power supply required, as demonstrated for wireless sensing of the rotation speed. The smart lighting for underwater photographing is also demonstrated by the color‐tunable SSL system with the best imaging quality achieved.

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Section: Resultsmentioning

confidence: 99%

Tribo‐Induced Color Tuner toward Smart Lighting and Self‐Powered Wireless Sensing

Wang

Yin

et al. 2021

Advanced Science

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“…Thermal management has become a significant consideration to maintain desired temperature uniformity to ensure high working efficiency and reliability. 1,2 Micro/mini-channels heat sinks are paid special attentions, due to their compact size, lightweight, and large heat exchange area. 3 The heat transfer performance of micro/mini-channels is recognized to be mostly dependent on the scale, cross-section geometry, and periodic density of a fluidic channel.…”

Section: Introductionmentioning

confidence: 99%

3D printing of alumina ceramic heat sink with mini‐channels for thermal management

Dang

Zhou

et al. 2023

Int J Applied Ceramic Tech

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Thermal management has become one of the most challenging issues for highpower, integrated, and miniaturized electronic devices. In this paper, an alumina ceramic heat sink with mini-channels was fabricated using a digital light processing 3D printing technology. Microstructures of the ceramic were investigated by scanning electron microscopy. A proper flow rate of water in the mini-channels was figured out for efficient cooling by infrared thermal imaging and microthermocouple characterizations. The ceramic heat sink was further integrated with a high-power laser diode module; cooling performance was evaluated by investigating the thermal resistance of the ceramic heat sink and the optoelectronic property of the laser diode module. Results indicated that the laser diode module could be operated at high driving power of 115.6 W. This study provided a new strategy for a highly efficient thermal management of electronic devices and highlighted the technical potential of ceramic heat sink with more compact coolant channels.

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“…The semiconductor laser bar has the significant advantage of high output power. However, with the increase of the output power, a large amount of waste heat will be generated, which seriously limits the further improvement of the laser performance [3,4]. Thermal accumulation causes the device temperature to rise, significantly affecting its photoelectric *qhw@semi.ac.cn characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…Further, this leads to non-uniformity in the excitation wavelength of each emitter of the bar and the spectrum broadening [3]. Therefore, understanding the thermal characteristics of semiconductor laser bar operation is theoretical guidance for the optimal design of bar structures, heat management, and improving laser reliability [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Analysis of thermal characteristics of microchannel-cooled photonic crystal laser diode bars

Zheng

Qu²,

Liu³

et al. 2022

Semiconductor Lasers and Applications XII

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Photonic crystal laser diode bars have the advantages of low vertical divergence angle and high resistance to catastrophic optical mirror damage. However, with the increase of output power, the waste heat problem is becoming more serious, affecting the further improvement of laser performance. Therefore, it is of great significance to study the thermal characteristics of bars. In this paper, the fluid-solid coupling conjugate heat transfer model of a microchannel cooled photonic crystal laser diode bar is established through the finite element method (FEM) and computational fluid dynamics (CFD) numerical methods. The transient thermal behavior, steady-state characteristics, and temperature distribution of photonic crystal laser diode bars under continuous (CW) operating states are studied in detail. The simulation results show that the junction temperature is 55.48°C, and the thermal resistance is 0.48 K/W. The closer the emitter is to the bar center, the easier the thermal crosstalk occurs. In the experiment, the continuous output power of the photonic crystal laser bar is 112.13 W at 120 A, the junction temperature is 57.14 °C, and the thermal resistance is 0.50 K/W. The simulations of bars are consistent with the experiment.

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Temperature distribution and thermal resistance analysis of high-power laser diode arrays

Cited by 16 publications

References 28 publications

Tribo‐Induced Color Tuner toward Smart Lighting and Self‐Powered Wireless Sensing

Tribo‐Induced Color Tuner toward Smart Lighting and Self‐Powered Wireless Sensing

3D printing of alumina ceramic heat sink with mini‐channels for thermal management

Analysis of thermal characteristics of microchannel-cooled photonic crystal laser diode bars

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