Abstract

In this paper, we propose and experimentally demonstrate a novel scheme to tailor the spectrum of random fiber laser (RFL) based on the multimode interference effect. A fiber loop mirror (FLM) incorporating multimode interference filter (MMIF) with SMF-MMF-SMF structure acts as a wavelength-dependent point refiector in half-opened RFL. By varying the length of MMF, either single wavelength random lasing with specific wavelength or multiwavelength random lasing with selective wavelength spacing can be generated in MMIF-FLM based RFL. The spectrum adjustable all fiberized RFL based on the MMIF shows distinct advantages such as easy fabrication, wide operating wavelength range, and low-cost. Besides, the MMIF-FLM can has good power handling ability, by combining the MMIF-FLM and the short-length cavity, the proposed MMIF based forwardpumping RFL also has a great potential to generate high power, high efficiency random lasing with the adjustable spectral property.

© 2018 The Author(s)