Low-spatial coherence electrically pumped red-emitting semiconductor laser

Yufei Jia; Yufei Wang; Linhai Xu; Shaoyu Zhao; Aiyi Qi; Wanhua Zheng

doi:10.1117/12.2502733

6 November 2018 Low-spatial coherence electrically pumped red-emitting semiconductor laser

Yufei Jia, Yufei Wang, Linhai Xu, Shaoyu Zhao, Aiyi Qi, Wanhua Zheng

Proceedings Volume 10812, Semiconductor Lasers and Applications VIII; 108120V (2018) https://doi.org/10.1117/12.2502733
Event: SPIE/COS Photonics Asia, 2018, Beijing, China

Abstract

High spatial coherence can maintain the beam stability of the laser after a long distance. However, it limits the applications in laser display including projection and imaging system, because the high coherence of laser diodes cause the artifacts such as speckle. In this work, we design a novel 6xx nm chaotic cavity laser diode, which consists of a Dshaped section used to achieve a large number of independent spatial modes thus reduce coherence and a stripe area to improve power. The radius of the D-shaped cavity is 500 μm and the length of stripe is 1000 μm. The red laser based on GaAs substrate is fabricated by standard photolithography and reactive ion etching process. To obtain an enough optical confinement by effective refractive index step, the etching depth exceeds the active region. The high-power chaotic cavity low-spatial coherence electrically pumped semiconductor laser is first realized with the wavelength around 630 nm. The spectrum width of 15 nm at full width at half maximum (FWHM) and output power of 300 mW is obtained under pulse operation. The speckle contrast is measured to be 5%, showing great potential of reducing speckle from the source directly for laser display.

Citation Download Citation

Yufei Jia, Yufei Wang, Linhai Xu, Shaoyu Zhao, Aiyi Qi, and Wanhua Zheng "Low-spatial coherence electrically pumped red-emitting semiconductor laser", Proc. SPIE 10812, Semiconductor Lasers and Applications VIII, 108120V (6 November 2018); https://doi.org/10.1117/12.2502733

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