• Photonics Research
  • Vol. 10, Issue 7, 1594 (2022)
Limin Jin1、4、*, Zhuo Liu1, Yuqi Zhang1, Yunkai Wu1, Yilin Liu1, Huachun Deng1, Qinghai Song1、2、3、5、*, and Shumin Xiao1、2、3、6、*
Author Affiliations
  • 1Ministry of Industry and Information Technology Key Laboratory of Micro-Nano Optoelectronic Information System, Harbin Institute of Technology, Shenzhen 518055, China
  • 2Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
  • 3Pengcheng Laboratory, Shenzhen 518055, China
  • 4e-mail: jinlimin@hit.edu.cn
  • 5e-mail: qinghai.song@hit.edu.cn
  • 6e-mail: shumin.xiao@hit.edu.cn
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    DOI: 10.1364/PRJ.456381 Cite this Article
    Limin Jin, Zhuo Liu, Yuqi Zhang, Yunkai Wu, Yilin Liu, Huachun Deng, Qinghai Song, Shumin Xiao. Lanthanide-doped nanocrystals in high-Q microtoroids for stable on-chip white-light lasers[J]. Photonics Research, 2022, 10(7): 1594 Copy Citation Text show less

    Abstract

    The plentiful energy states of lanthanide (Ln3+)-doped nanomaterials make them very promising for on-chip integrated white-light lasers. Despite the rapid progresses, the Ln3+-based white upconversion emissions are strongly restricted by their low upconversion quantum efficiency and the color stability. Herein, we combine the CaF2:Yb35Tm1.5Er0.5 nanocrystals and the high-Q microtoroids, and experimentally demonstrate the chip-integrated stable white-light laser. By optimizing the sizes, density, and distributions of Ln3+-doped nanocrystals, the Q factors of Ln3+-doped microtoroids are maintained as high as 5×105. The strong light matter interaction in high-Q microtoroids greatly enhances the upconversion emission and dramatically reduces the laser thresholds at 652 nm, 545 nm, and 475 nm to similarly low values (1.892.10 mJ cm-2). Consequently, robust white-light microlaser has been experimentally achieved from a single microtoroid. This research has paved a solid step toward the chip-scale integrated broadband microlasers.

    1. INTRODUCTION

    On-chip integrated multicolor microlasers have been intensively studied owing to their practical applications ranging from miniaturized coherent light source, optical sensing, to visible light communication [17]. Compared with the combination of several microlasers, the white-light microlaser from a single nanomaterial is more attractive for on-chip integration [816]. In 2015, Fan et al. reported a monolithic white-light laser by parallelly combining ZnCdSSe-based segments into the same microcrystal [8]. Soon after, multicolor microlasers were widely observed in various systems, e.g., V2C-based quantum dots, luminescent polymers, organic dyes-doped polymer, and liquid crystals [914]. Despite the continuous success, these white-light microlasers are either simple compositions of parallel microlasers or generated by the reabsorption and the re-emission. From the point view of practical applications, these multicolor microlasers usually come from different locations and the eventual white colors are strongly dependent on the excitation density.

    Copy Citation Text
    Limin Jin, Zhuo Liu, Yuqi Zhang, Yunkai Wu, Yilin Liu, Huachun Deng, Qinghai Song, Shumin Xiao. Lanthanide-doped nanocrystals in high-Q microtoroids for stable on-chip white-light lasers[J]. Photonics Research, 2022, 10(7): 1594
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