Mode-locked fibre lasers with an adjustable drop-shaped cavity

B. N. Nyushkov, S. M. Kobtsev, N. A. Koliada, A. A. Antropov, V. S. Pivtsov, A. V. Yakovlev

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

We report the first implementation of a new cavity topology for mode-locked fibre lasers. This new 'drop-shaped' cavity topology employs a dual-fibre optical collimator and allows for a relatively simple cavity design with continuously adjustable length. It combines the advantages of the conventional ring cavity topology with the adjustment capabilities of hybrid ring-linear cavities (e.g. σ-cavities). Reliable femtosecond pulsed lasing was demonstrated in the experimental drop-shaped Er-doped fibre lasers, which were mode-locked in two different ways - by exploiting nonlinear polarisation evolution (NPE) and by means of a semiconductor saturable absorber. In the case of NPE-based mode locking, the shortest pulse duration was ∼450 fs. The pulse repetition rate could be continuously varied within 3 kHz around ∼25 MHz in the NPE-mode-locked lasers when the distance between the dual-fibre optical collimator and the cavity mirror was adjusted. This feature could, in principle, allow active stabilisation of the pulse repetition rate. Thus, mode-locked fibre lasers with the proposed drop-shaped cavity topology could be applied in metrology and other fields where a high stability of pulse repetition rate or its synchronization with an external clock is required.

Original languageEnglish
Article number115101
Number of pages7
JournalLaser Physics Letters
Volume14
Issue number11
DOIs
Publication statusPublished - 1 Nov 2017

Keywords

  • fibre lasers
  • mode locking
  • optical resonators
  • MANAGEMENT
  • SOLITON LASER
  • NONLINEAR POLARIZATION EVOLUTION
  • REPETITION RATE CONTROL
  • LOCKING
  • PULSES
  • ERBIUM LASER
  • MASTER OSCILLATOR
  • GENERATION
  • RING CAVITY

Fingerprint Dive into the research topics of 'Mode-locked fibre lasers with an adjustable drop-shaped cavity'. Together they form a unique fingerprint.

Cite this