Thermal behavior of microchannel cooled high power diode laser arrays

Wu, Dihai; Zhang, Pu; Nie, Zhiqiang; Xiong, Lixia; Song, Yuming; Zhu, Qiwen; Lu, Yuanzheng; Liu, Xingsheng

doi:10.1109/icept.2016.7583183

Cited by 2 publications

(1 citation statement)

References 12 publications

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“…The reason is that the heat dissipation pathway of the front cavity surface is less than the rear cavity surface and the edge of the emitter is affected by the thermal crosstalk of the adjacent emitter is small. The temperature distribution in the vertical direction of the laser bar is shown in Figure 10, which reveals the temperature rise in each layer of the laser bar, indicating that 86.485 %, 3.595 %, and 9.921 % of the total thermal resistance of the device comes from the heat sink, the solder interface, and the laser bar respectively [14]. 13., the heating of all emitters is the same, which means that these emitters have experienced an independent heating process during this period, and there is no temperature difference due to the horizontal diffusion of heat.…”

Section: Steady-state Thermal Behaviormentioning

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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Section: Steady-state Thermal Behaviormentioning

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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Optimization of Heat-Dissipation Structure of High-Power Diode Laser in Space Environments

Cheng,

Sun,

Dai

et al. 2024

Micromachines

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The high-power laser diode (HPLD) has witnessed increasing application in space, as the aerospace industry is developing rapidly. To cope with the space environment, optimizing the heat-dissipation structure and improving the heat-dissipation ability via heat conduction have become key to researching the thermal reliability of the HPLD in space environments. Based on a theoretical analysis of the HPLD, a simulation model of the HPLD was constructed for numerical simulation, and it was found that the maximum temperature and thermal resistance of lasers were efficaciously decreased by changing the packaging position of laser bars. The packaging position of the bars and the cutting angle of the microchannel heat sink (MCHS) were determined based on the light-emitting angle of the light-emitting unit and the internal structure of the MCHS. The internal structure of the MCHS was optimized through a single-factor experiment, an orthogonal experiment, and the combination of neural networks and genetic algorithms (GAs), using three key structural parameters, namely the MCHS ridge width, W1, the channel width, W2, and the channel length, L1. After optimization, the performance of the MCHS was obviously improved. Finally, an analysis was carried out on the applicability of the optimized MCHS to bars with a higher power.

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Thermal behavior of microchannel cooled high power diode laser arrays

Cited by 2 publications

References 12 publications

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

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

Optimization of Heat-Dissipation Structure of High-Power Diode Laser in Space Environments

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