Low thermal resistance high-speed top-emitting 980-nm VCSELs |
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Authors: | AN Al-Omari GP Carey S Hallstein JP Watson G Dang KL Lear |
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Affiliation: | Electr. & Comput. Eng. Dept., Colorado State Univ., Fort Collins, CO, USA; |
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Abstract: | Increasing copper plated heatsink radii from 0 to 4 /spl mu/m greater than the mesa in vertical-cavity surface-emitting lasers (VCSELs) reduced the measured thermal resistance for a range of device sizes to values 50% lower than previously reported over a range of device sizes. For a 9-/spl mu/m diameter oxide aperture, the larger heatsink increases output power and bandwidth by 131% and 40%, respectively. The lasers exhibit a 3-dB modulation frequency bandwidth up to 9.8 GHz at 10.5 kA/cm/sup 2/. The functional dependence of thermal resistance on oxide aperture diameter indicates the importance of lateral heat flow to mesa sidewalls. |
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