Efficient Multilayer Near-Infrared Microbottle Laser Pumped by a 532 nm Nanosecond Laser

This paper presents an investigation into organic near-infrared (Near-IR) laser materials for microcavity lasers. Near-IR microcavity lasers offer diverse applications, particularly in the field of biophotonics. The research employs Nile-Blue and Rhodamine B doped in SU-8 as the laser-active materials. While the Nile-Blue dye demonstrates lasing around a 750 nm wavelength, achieving optimal absorption with a nanosecond pump in the 550-650 nm range poses a challenge. Conversely, readily available pump sources such as Nd:YAG lasers operating at 532 nm are preferred. To address this challenge, we have both simulated and experimentally explored various configurations, including Nile-Blue:SU-8 lasers, combined Nile-Blue and Rhodamine B lasers in SU-8, and multilayer lasers incorporating these dyes. The outcome of this study is the development of an optimized microlaser structure.