Article,
Theory and experiment of transient two-wave mixing in Yb-doped single-frequency fiber amplifiers induced by frequency modulation.
Contributors
Hauge, Jakob M
0000-0003-1880-8465
[1]
[2]
Affiliations
- [1] NKT Photonics A/S [NORA names: NKT Holding; Private Research];
- [2] Technical University of Denmark [NORA names: DTU Technical University of Denmark; University; Denmark; Europe, EU; Nordic; OECD];
- [3] Norlase ApS
Abstract
This paper presents a theoretical and experimental characterization of an instability phenomenon observed in single-frequency fiber amplifiers when the frequency of the seed laser is modulated. The instability manifests itself as fluctuating elastic back-reflections that occur only when the frequency is decreasing with time. The theory is a generalization of a coupled-mode model developed for a single-frequency fiber amplifier back-seeded with a constant frequency shift relative to the main signal. It can explain most observed features of the experiments in a qualitative and semi-quantitative way. Open questions and directions for further developments are also discussed.
Keywords
amplifier,
back reflection,
characterization,
constant frequency shift,
coupled-mode model,
development,
direction,
experimental characterization,
experiments,
features,
fiber amplifier,
frequency,
frequency modulation,
frequency shift,
generalization,
instability,
instability phenomena,
laser,
mixing,
model,
modulation,
open questions,
phenomenon,
questions,
seed,
seed laser,
semi-quantitative way,
shift,
signal,
single-frequency,
single-frequency fiber amplifiers,
theory,
transient two-wave mixing,
two-wave mixing,
way
