Tuning WGM Lasing in Irregular Cavities with Arbitrary Boundaries

Abstract

Because of its limited light field mode and high Q value, the whispering-gallery-mode (WGM) cavity has been widely studied. In this study, we propose a simple, rapid, low-cost and no-manufacturing technology method that we call the drip-coating method to obtain an irregular cavity with arbitrary boundaries (ICAB). By using a polyvinyl alcohol (PVA) solution doped with Rhodamine 6G, the ICAB was drip-coated on a high-reflection mirror, forming a WGM laser. The sample was pumped by a 532 nm pulsed laser, and the single-mode WGM, multi-WGM lasing were obtained. The WGM originates from both the total reflection of the PVA/air interface and the vertical reflection of the PVA/mirror interface. The other boundaries of the cavity were not involved in the reflection and could be any shape. The mechanism of producing single-mode lasing is due to the action of the loss-gain cavity. Multi-WGM lasing is attributed to at least two groups of different WGMs exist in an irregular cavity. It can be confirmed by using a microsphere model and intensity correlation method. These results may provide an alternative for the design of WGM lasers.

Article information

Article type
Paper
Submitted
17 Jun 2021
Accepted
10 Oct 2021
First published
13 Oct 2021

Nanoscale, 2021, Accepted Manuscript

Tuning WGM Lasing in Irregular Cavities with Arbitrary Boundaries

D. Su, T. Zhai, K. Ge, S. Zhang, Z. Xu, J. Tong, H. Li, S. Sun, Y. Zhang and X. Wang, Nanoscale, 2021, Accepted Manuscript , DOI: 10.1039/D1NR03938E

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