Design of GaN-Based PCSEL With Temperature-Insensitive Lasing Wavelength

Liu, Qifa; Wang, Zhenhai; Ma, Xinyu; Wang, Jin; Zhou, Weidong

doi:10.1109/jphot.2021.3091140

Cited by 5 publications

(1 citation statement)

References 40 publications

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“…The data rate could also be further improved in the future with the rapid development of high-power, high-speed photonic crystal surface emitting lasers (PCSELs). 27,28 . We will investigate the capability of high data rate with our white laser platform in the future, as well as heat sink design for more effective heat dissipation for multiple LDs.…”

Section: Discussionmentioning

confidence: 99%

High-efficiency, low-speckle contrast white laser lighting via multi-stage scattering and photon recycling

Liu

Wang

Carver

et al. 2023

Preprint

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Lighting consumes > 10% of the global electricity. White laser lighting, utilizing either direct color mixing or phosphor-conversion, can potentially boost the efficiency well beyond existing light emitting diodes (LEDs) especially at high current density. Here we present a compact, universal packaging platform for both laser lighting schemes, which is simultaneously scalable to wavelength division multiplexing for visible light communication. Using commercially available laser diodes and optical components, low-speckle contrast ≤ 5% and uniform illumination is achieved by multi-stage scattering and photon recycling through a mixing rod and static diffusers in a truncated-pyramidal reflective cavity. We demonstrate a high luminous efficacy of 274 lm/Wo for phosphor-converted laser lighting and 150 lm/Wo for direct red-green-blue laser mixing, respectively, in reference to the input optical power. In the former case, the luminous efficacy achieved for practical lighting is even higher than most of the previous reports measured using integrating spheres. In the latter case of direct laser color mixing, to our best knowledge, this is the first time to achieve a luminous efficacy approaching their phosphor-conversion counterparts in a compact package applicable to practical lighting. With future improvement of blue laser diode efficiency and development of yellow/amber/orange laser diodes, we envision that this universal white laser package can potentially achieve a luminous efficacy > 275 lm/We in reference to the input electrical power, ~ 1.5x higher than state-of-the-art LED lighting and exceeding the target of 249 lm/We for 2035.

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Section: Discussionmentioning

confidence: 99%

High-efficiency, low-speckle contrast white laser lighting via multi-stage scattering and photon recycling

Liu

Wang

Carver

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

The future of photonic crystal surface-emitting lasers

Zhou,

Pan

2023

Applied Physics Letters

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Semiconductor lasers are the heart for the development of technologies in many fields. In recent decades, a new type of large-area surface-emitting lasers based on the in-plane photonic crystal modulation and feedback have emerged to show superior advantages of high output power, low-divergence, high beam quality and brightness, and compact and monolithic structure. In this paper, we review the design and development of photonic crystal surface-emitting laser and discuss the future investigation and improvements.

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Optimal waveguide structure for low-threshold InGaN/GaN-based photonic-crystal surface-emitting lasers

Hsieh,

Huang,

Chen

et al. 2024

AIP Advances

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We analyzed the optimal waveguide structure of two types of InGaN-based photonic crystal surface-emitting lasers (PCSELs) to suppress the coupling with leaky modes via mode simulations. To minimize the threshold material gain (gth), we calculated the confinement factor and quality factor of PCSELs with varying waveguide layer thicknesses in the separate confinement heterostructure (SCH) layer. The optical mode intensity profile revealed the coupling between the fundamental mode of SCH and parasitic leaky modes in the cladding layer or substrate as the primary root cause of the low-quality factor and high threshold gain of PCSELs. The asymmetric nature of the SCH structure yielded the optimal waveguide structure to be dependent on the position of the air holes. With a proper waveguide thickness and air hole depth, the optimized threshold modal gain of PCSELs with the n-side air holes can be less than 30 cm−1.

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Design of GaN-Based PCSEL With Temperature-Insensitive Lasing Wavelength

Cited by 5 publications

References 40 publications

High-efficiency, low-speckle contrast white laser lighting via multi-stage scattering and photon recycling

High-efficiency, low-speckle contrast white laser lighting via multi-stage scattering and photon recycling

The future of photonic crystal surface-emitting lasers

Optimal waveguide structure for low-threshold InGaN/GaN-based photonic-crystal surface-emitting lasers

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