Abstract
Mode-locking is a milestone in the history of lasers that allows the generation of short light pulses and stabilization of lasers. This phenomenon is known to occur only in standard ordered lasers for long time and until recently it is found that it also occurs in disordered random lasers formed by nanoscale particles. Here, we report the realization of a so-called quasi mode-locking of coherent feedback random fiber laser which consists of a partially disordered linear cavity formed between a point reflector and a random distributed fiber Bragg grating array with an inserted graphene saturable absorber. We show that multi-groups of regular light pulses/sub-pulses with different repetition frequencies are generated within the quasi mode-locking regime through the so-called collective resonances phenomenon in such a random fiber laser. This work may provide a platform to study mode locking as well as pulse dynamic regulation of random lasing emission of coherent feedback disordered structures and pave the way to the development of novel multi-frequency pulse fiber lasers with potentially wide frequency tuning range.
Highlights
Mode-locking is a milestone in the history of lasers that allows the generation of short light pulses and stabilization of lasers
We report the realization of a so-called quasi mode-locking of coherent feedback random fiber laser which consists of a partially disordered linear cavity formed between a point reflector and a random distributed fiber Bragg grating array with an inserted graphene saturable absorber
We show that multi-groups of regular light pulses/sub-pulses with different repetition frequencies are generated within the quasi mode-locking regime through the so-called collective resonances phenomenon in such a random fiber laser
Summary
Mode-locking is a milestone in the history of lasers that allows the generation of short light pulses and stabilization of lasers. We show that multi-groups of regular light pulses/sub-pulses with different repetition frequencies are generated within the quasi mode-locking regime through the so-called collective resonances phenomenon in such a random fiber laser. Unique resonance channels and numerous cavity modes of CFRFLs would provide a prospective way for mode locking and dynamical regulation of laser outputs[30], giving birth to a brand new type of pulsed RFLs. For example, CFRFLs with various lasing modes have the potential of achieving multi-frequency generation or wide tunable frequency range in the mode-locking regime, which is difficult to be realized in conventional mode-locked lasers with fixed cavity lengths[17,18,19,20]. The study could be a useful attempt for dynamic regulation of light behavior in disordered structures
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