Two Photon-Pumped Whispering-Gallery Mode Lasing and Dynamic Regulation

Junfeng Lu; Fangtao Li; Wenda Ma; Jufang Hu; Yiyao Peng; Zheng Yang; Qiushuo Chen; Chunxiang Xu; Caofeng Pan; Zhong Lin Wang

doi:10.1002/advs.201900916

Two Photon-Pumped Whispering-Gallery Mode Lasing and Dynamic Regulation

Adv Sci (Weinh). 2019 Sep 30;6(22):1900916. doi: 10.1002/advs.201900916. eCollection 2019 Nov.

Authors

Junfeng Lu^{1

2}, Fangtao Li¹, Wenda Ma^{1

2}, Jufang Hu¹, Yiyao Peng^{1

2}, Zheng Yang^{1

2}, Qiushuo Chen¹, Chunxiang Xu³, Caofeng Pan^{1

2}, Zhong Lin Wang^{1

2

4}

Affiliations

¹ CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-Nano Energy and Sensor Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing 100083 P. R. China.
² School of Nanoscience and Technology University of Chinese Academy of Sciences Beijing 100049 P. R. China.
³ State Key Laboratory of Bioelectronics School of Biological Science and Medical Engineering Southeast University Nanjing 210096 P. R. China.
⁴ School of Materials Science and Engineering Georgia Institute of Technology Atlanta GA 30332-0245 USA.

Abstract

Realizing the dynamic regulation of nonlinear optical signals has a great scientific significance for the development of new-type nonlinear optoelectronic devices and expands its application in the field of laser technology, spectroscopy, material structure analysis, etc. Here, two photon absorption-induced whispering-gallery mode lasing from a single ZnO microresonator with a relatively low lasing threshold (15 µW) and high quality factor (Q ≈ 3200) under ambient conditions is demonstrated. Furthermore, success is achieved in obtaining the dynamic regulation of two photon-pumped lasing mode in the UV gain region. The corresponding resonant wavelength can be tuned dynamically from 388.99 and 391.12 to 390.01 and 392.12 nm for TE₃₃ and TE₃₂ modes, respectively. This work provides a new strategy for building high-performance mode-adjustable frequency upconversion lasers.

Keywords: frequency upconversion lasers; mode regulation; nonlinear optics; piezoelectric polarization effect; two‐photon absorption; whispering‐gallery mode.