High-power and single-mode VCSEL arrays with single-polarized outputs by using package-induced tensile strain

Jin Wei Shi, Zuhaib Khan, Ray Hua Horng, Hsiao Yun Yeh, Chun Kai Huang, Cheng Yi Liu, Jie Chen Shih, Yung Hao Chang, Jia Liang Yen, Jinn Kong Sheu

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摘要

In this work, we demonstrate a novel high-power vertical-cavity surface-emitting laser (VCSEL) array with highly single-mode (SM) and single-polarized output performance without significantly increasing the intra-cavity loss and threshold current (Ith). By combining a low-loss zinc-diffusion aperture with an electroplated copper substrate, we can obtain a highly SM output (side mode suppression ratio >50 dB) with a very narrow divergence angle (1/e2: ∼10) under high output power (3.1 W; 1% duty cycle) and sustain a single polarization state, with a polarization suppression ratio of around 9 dB, under the full range of bias currents. Compared to the reference device without the copper substrate, the demonstrated array can not only switch the output optical spectra from quasi-SM to highly SM but also maintain a close threshold current value (Ith: 0.8 versus 0.7 mA per unit device) and slope efficiency. The enhancement in fundamental mode selectivity of our VCSEL structure can be attributed to the single-polarized lasing mode induced by tensile strain, which is caused by the electroplated copper substrate, as verified by the double-crystal x-ray measurement results.

原文English
頁(從 - 到)4839-4842
頁數4
期刊Optics Letters
45
發行號17
DOIs
出版狀態Published - 2020 九月 1

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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