Abstract
We propose and experimentally demonstrate an intra-cavity transverse mode-switchable fiber laser based on a mode-selective photonic lantern and a few-mode Er-doped fiber amplifier. The six lowest-order LP modes can lase independently and are switchable by changing the input port of the photonic lantern. We measured the slope efficiency, mode intensity profile, and optical spectrum of each lasing mode. In addition, we demonstrate donut-shaped LP11 and LP21 modes using incoherent superposition and simultaneous lasing of the two degenerate modes.
Highlights
High-order transverse mode lasers are beneficial for a number of applications
We demonstrate a transverse mode-switchable erbium-doped fiber laser based on a 6-mode-selective photonic lantern (MSPL)
It should be noted that there are splicing losses between the passive fewmode fiber (FMF) and the gain fiber, and the losses are different for each linear polarization (LP) mode, so the absorbed pump powers are smaller than the values shown in Fig. 4 and are not the same for all the pump modes
Summary
High-order transverse mode lasers are beneficial for a number of applications. For example, high-order linear polarization (LP) modes in optical fiber have higher thresholds for detrimental nonlinear impairments, such as stimulated Brillouin scattering (SBS), compared to the fundamental mode [1]. An intra-cavity donut mode laser was reported that was generated by an incoherent superposition of two degenerate petal modes lasing together in the same cavity [19].
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