In:
Optics Letters, Optica Publishing Group, Vol. 48, No. 7 ( 2023-04-01), p. 1830-
Kurzfassung:
We report a hybrid mode-locked fiber laser at 2.8 µm based on a large-mode-area Er:ZBLAN fiber. Reliable self-starting mode-locking is achieved via the combination of nonlinear polarization rotation and a semiconductor saturable absorber. Stable mode-locked pulses with a pulse energy of 9.4 nJ and a pulse duration of 325 fs are generated. To the best of our knowledge, this is the highest pulse energy directly generated from a femtosecond mode-locked fluoride fiber laser (MLFFL) to date. The measured M 2 factors are below 1.13, indicating a nearly diffraction-limited beam quality. Demonstration of this laser provides a feasible scheme for the pulse energy scaling of mid-infrared MLFFLs. Moreover, a peculiar multi-soliton mode-locking state is also observed, in which the time interval between the solitons varies irregularly from tens of picoseconds to several nanoseconds.
Materialart:
Online-Ressource
ISSN:
0146-9592
,
1539-4794
Sprache:
Englisch
Verlag:
Optica Publishing Group
Publikationsdatum:
2023
ZDB Id:
243290-0
