High Power and Narrow Vertical Divergence Laser Diodes With Photonic Crystal Structure

Chen, Zhonghao; Qi, Aiyi; Zhou, Xuyan; Qu, Hongwei; Chen, Jingxuan; Jia, Yanming; Zheng, Wanhua

doi:10.1109/lpt.2021.3065963

Cited by 20 publications

(11 citation statements)

References 18 publications

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“…In order to reduce the BPP of the reference laser to the similar scale as the NES laser, the far-field FWHM needs to be reduced to about 18°. The small far-field divergence can be easily achieved through super large optical cavity or photonic crystal structure [16,17], but the emitter spacing will be further increased at the same time. At least, under the above waveguide size, it is difficult for the reference laser to reduce the far-field FWHM to 18°.…”

Section: The Design Of Epitaxial Layersmentioning

confidence: 99%

Beam parameter product optimization of densely arranged multi‐emitter tunnel junction cascaded laser

Wang

Zhang

et al. 2023

Electronics Letters

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A tunnel junction cascaded semiconductor laser with thin waveguide and narrowed spacing between adjacent emitters is designed in this work. It can be concluded theoretically that the spatial size of the spots arrangement in fast axis has a greater impact on the vertical beam parameter product (BPP) of the multi-emitter cascaded laser than the divergence angle. The measured vertical BPP of the designed narrow emitter spacing (NES) laser has been reduced 42.5%, which implies that the beam quality performance of the laser has been improved and proves the feasibility of this method. Meanwhile, the slope efficiency of the thin waveguide NES laser can reach up to 3.55 W/A under 10 ns duration pulse current.

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Section: The Design Of Epitaxial Layersmentioning

confidence: 99%

Beam parameter product optimization of densely arranged multi‐emitter tunnel junction cascaded laser

Wang

Zhang

et al. 2023

Electronics Letters

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“…As the injection current increases, the chip is seriously heated, which may cause the rapid increase in the temperature of the active region of the laser, leading to problems such as the increase of the threshold current, the red shift of the wavelength, and the decrease of the slope efficiency [3]. Photonic crystal laser diodes are characterized by low divergence angle and high brightness [4][5][6], therefore, it is of great importance to deeply study the thermal characteristics of high-power photonic crystal laser diodes, solve their heat dissipation problems, and also improve the output power and increase the lifetime [7].…”

Section: Introductionmentioning

confidence: 99%

Study of thermal characteristics of high-power photonic crystal laser diodes with CS-mount package

Liu

Zhou

et al. 2022

Semiconductor Lasers and Applications XII

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Photonic crystal laser diodes are characterized by low divergence angle and high brightness, but thermal effects have become a major obstacle to further improvement of output power and efficiency. The thermal characteristics of highpower photonic crystal laser diodes are of great importance to improve the output power and increase the lifetime. In this paper, the physical heat dissipation model of a single photonic crystal laser diode with CS-mount package is established. Steady-state thermal characteristics simulations are performed using the finite element method (FEM) and the influences of different parameters, such as solder, transition heat sink and heat sink on the thermal characteristics are analyzed. The simulation results show that the thickness and thermal conductivity of the heat sink materials are the main factors impacting the heat dissipation of the laser. The thermal resistance of the laser can be reduced effectively by using heat sink materials of high thermal conductivity. On the premise of ensuring wettability and reliability, the thickness of the solder layer should be decreased. A photonic crystal laser diode with a cavity length of 4 mm and a stripe width of 350 µm based on an optimized heat dissipation structure is designed and fabricated. The CW output power of 41.9 W, the vertical divergence angle of 18.48°and the thermal resistance of 1.54 K/W are obtained under the injection current of 50 A at 20 ℃.

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“…Photonic crystal laser diodes have the advantages of low vertical divergence angle and high resistance to catastrophic optical damage of their cavity facet [7][8][9][10]. The thermal management of photonic crystal laser diode bars can be improved by understanding its thermal properties.…”

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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High Power and Narrow Vertical Divergence Laser Diodes With Photonic Crystal Structure

Cited by 20 publications

References 18 publications

Beam parameter product optimization of densely arranged multi‐emitter tunnel junction cascaded laser

Beam parameter product optimization of densely arranged multi‐emitter tunnel junction cascaded laser

Study of thermal characteristics of high-power photonic crystal laser diodes with CS-mount package

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

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