Selective transverse mode emission from all polarization-maintaining fiber lasers

TL;DR

This paper presents a novel all polarization-maintaining fiber laser capable of selectively emitting specific transverse modes, including LP11 and OAM vortex beams, using innovative splicing and polarization techniques.

Contribution

It introduces a new method combining splicing, birefringence, and polarization rotation to achieve selective transverse mode emission in PMF lasers.

Findings

Successfully generated LP11 mode with 360° rotation

Realized OAM vortex beams with ±1 topological charge

Demonstrated both linear and ring cavity configurations

Abstract

We demonstrated an all polarization-maintaining fiber (PMF) laser which could offer selective transverse mode emission. Offset and cross splicing between PMF sections was used to generate higher order mode and to yield a birefringence induced mode filter. Polarization rotation technique (PRT) was used to select the output beam profile. Both linear cavity and ring cavity were explored. Experimentally, 360{\deg} rotating LP11 mode and OAM vortex beam with plus and minus 1 topological charges have been realized from an all PMF linear cavity laser and a ring cavity laser respectively.