Ultra-high peak power laser diode arrays with 1kA-class low-SWaP drive electronics

Woods, L.M.; Crowley, M. T.; Thiagarajan, P.; Ruben, Eric; Goings, J.; Hosoda, Takashi; Rowe, Maximillian; Liu, B.; Caliva, Brian; Crapo, Neil

doi:10.1117/12.2575948

Cited by 3 publications

(1 citation statement)

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“…For pulse-pump applications, such laser sources are typically arranged together in a stack and operated under quasicontinuous-wave (QCW) mode. QCW laser bars providing more than P opt = 1 kW peak power have been realized both in single bar [2] and stack configuration [3]. Power scaling is possible by integrating several active regions using tunnel junction (TJ).…”

Section: Introductionmentioning

confidence: 99%

Optimizing Vertical and Lateral Waveguides of kW-Class Laser Bars for Higher Peak Power, Efficiency and Lateral Beam Quality

et al. 2022

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GaAs-based, highly-efficient, kW-class, 1-cm laser bars with high peak power P opt and improved beam quality in quasi-continuous-wave mode are presented. The use of an extreme-triple-asymmetric (ETAS) epitaxial layer structure diminishes power saturation of high-power bars at high driving current. The resulting ETAS bars with 4 mm cavity produce a record 1.9 kW peak power, limited by available current supply, with a maximum power conversion efficiency η E = 67% at T HS = 25 °C heat-sink temperature. Both P opt and η E have been increased further by operating the bars at T HS = −70 °C. Sub-zero operation raises the P opt to 2.3 kW and the maximum η E to 74%. A second configuration of ETAS bars with optimized lateral layout is further realized to obtain narrow lateral beam divergence θ up to 2 kA driving current, without sacrificing P opt and η E . A 2-3°lower θ (95% power level) is observed over a wide operating range at room temperature. A high degree of polarization is also maintained across the whole operating range.

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Section: Introductionmentioning

confidence: 99%

Optimizing Vertical and Lateral Waveguides of kW-Class Laser Bars for Higher Peak Power, Efficiency and Lateral Beam Quality

et al. 2022

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High-power operations of single-mode surface grating long oxide aperture VCSELs

Hassan

Nakahama

et al. 2021

Applied Physics Letters

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A high-power single-mode vertical cavity surface emitting laser (VCSEL) based on a slow light mode (SLM) concept is demonstrated. Shallow surface gratings were implemented to select a single slow light mode in mm long oxide aperture VCSELs. The vertical structure and well-established fabrication processes are unchanged from those of conventional 850 nm VCSELs. An electron-beam lithography is used to form a 1st-order shallow grating on the surface. Thanks to the low effective index and the intensity penetration of the SLM to the surface, the grating fabrication process is much easier than conventional guided mode distributed feedback lasers. A stable single mode with a high side suppression ration of more than 30 dB is obtained for the entire current range under CW operations. A narrow divergence of 0.038° in far field patterns is achieved for a 6 mm long device. A record single-mode power of more than 5 W is realized before saturation under 50 ns pulse operations. Unlike long cavity in-plane edge emitting lasers, a SLM-based VCSEL can provide higher output powers without limitation of catastrophic optical mirror damage. The high power, superior mode stability, and good beam quality of our unique design paves a way for VCSELs to be used for wide ranges of high-power applications.

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Highly Asymmetric Epitaxial Designs for Increased Power and Efficiency in kW-Class GaAs-Based Diode Laser Bars

Miah

Boni

Martin

et al. 2021

2021 27th International Semiconductor Laser Conference (ISLC)

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Ultra-high peak power laser diode arrays with 1kA-class low-SWaP drive electronics

Cited by 3 publications

References 0 publications

Optimizing Vertical and Lateral Waveguides of kW-Class Laser Bars for Higher Peak Power, Efficiency and Lateral Beam Quality

Optimizing Vertical and Lateral Waveguides of kW-Class Laser Bars for Higher Peak Power, Efficiency and Lateral Beam Quality

High-power operations of single-mode surface grating long oxide aperture VCSELs

Highly Asymmetric Epitaxial Designs for Increased Power and Efficiency in kW-Class GaAs-Based Diode Laser Bars

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