Whispering gallery mode microlaser based on a single polymer fiber fabricated by electrospinning

Abstract

Electrospinning is a very simple method of preparing polymer solutions into high performance fibers. In this work, PM597doped polymer fibers with different diameters have been fabricated by electrospinning technology. Whispering gallery mode (WGM) lasing emission has been observed when a 532 nm pulse laser beam radially excited the single electrospun polymer fiber (EPF). The distribution of WGMs is also quantitatively confirmed through theoretical calculation. In addition, the number of WGM laser peaks decreases as the diameter of the EPF decreases. Single longitudinal mode laser emission can be obtained when the EPF diameter decreases to 8.8 μm. It has also been found that WGM laser from single EPF have relatively low thresholds and good lifetime compared to droplets or other fiber lasers. Moreover, EPF networks have unique research prospects in photonic devices, optical pump lasers, and biosensing due to their very large surface to volume ratio.

Fiber Optofluidic Microlasers: Structures, Characteristics, and Applications

“…[101][102][103] Wavelength and intensity tunability can also [16] c) single layer of gain molecules, [3] and d) doped polymer optical fiber. [114] (b) Reproduced with permission. [16] Copyright 2000, American Physical Society.…”

“…Wavelength-tunable OFLs have been extensively reported in the literature. The reconfigurability of microfluidics enables tunable emission by changing the concentration and the 18 μm-20 mm [ 4,100,102,103] Two cleaved metallic-coated end face of fiber, [ 4,14,100] CO 2 laser ablation, [ 97,98] or Fresnel reflection on the fiber flat [27] COF WGM 5 × 10 5 -3 × 10 7 [16,104] 15-196 μm [ 104,172] Fiber drawing technique [ 16,106] or electrospinning [ 114] HOF WGM 3 × 10 3 -1 × 10 7 [29,116] 75-320 μm [ 34,173] Fiber drawing technique, [12] coating, [ 124] or chemical etching [ 29,116] MOF WGM/Photonic gap 4 × 10 4 -1 × 10 9 [17,26] 113-180 μm [ 133,135] Fiber drawing technique [ 129] or chemical etching [ 135] Microfiber Microring resonator 3 × 10 4 -6 × 10 4 [75,84] 360 μm-2 mm [ 75,84,141] Tie a knot by microfiber [ 75,84,141] Microbubble WGM 10 6 -10 9 [ 82,78,174] 3-600 μm [ 78,…”

“…a) Optical resonance mechanism in COFs. Schematic diagrams of FOFLs based on b) fiber-incapillary structure,[16] c) single layer of gain molecules,[3] and d) doped polymer optical fiber [114]. (b) Reproduced with permission [16].…”

“…Copyright 2014, The Royal Society of Chemistry. (d) Reproduced with permission [114]. Copyright 2019, IOP Publishing.…”

Microwave-assisted in situ laser dye incorporation into high sensitivity whispering gallery mode microresonators

“…It is thus reasonable to exploit WGM-µR at lower diameters. Simple approaches to prepare 10 s to 100 s of µm sized WGM-based microlasers include protein self assembly [30,31], use of metal organic frameworks [32], and electrospinning [33,34].…”