Optimization of an NALM Mode-Locked All-PM Er:Fiber Laser System

We present an improved design of a nonlinear amplifier loop mirror (NALM) mode-locked Er-fiber laser system with fiber amplifier and compressor contained in all polarization maintaining fiber architecture. Cooperated with a phase shifter in the NALM, the onset behaviors are investigated by optimizin...

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Bibliographic Details
Published in:IEEE photonics technology letters 2017-12, Vol.29 (23), p.2119-2122
Main Authors: Chen, Feihong, Hao, Qiang, Zeng, Heping
Format: Article
Language:English
Subjects:
Amplification
erbium
fiber amplifiers
Fiber lasers
Laser mode locking
Lasers
Optical fiber amplifiers
Optical fiber couplers
Optical fiber dispersion
Optical fibers
Optimization
pulse compression
Pump lasers
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Summary:We present an improved design of a nonlinear amplifier loop mirror (NALM) mode-locked Er-fiber laser system with fiber amplifier and compressor contained in all polarization maintaining fiber architecture. Cooperated with a phase shifter in the NALM, the onset behaviors are investigated by optimizing the laser gain and net-cavity dispersion. As a result, the pulsation threshold is remarkably decreased and as short as 10-ms build-up time is achieved. In addition, with a single-stage bidirectional pumped Er-doped fiber amplifier, the self-started seed pulses of 2.6-mW average power, centered at 1576 nm, are nonlinearly compressed to 42-fs duration with single pulse energy of 2.2 nJ. Moreover, by appropriately optimizing the length of cavity gain and fiber in compressor, 28-fs duration with 3-nJ pulse energy is also achieved from a "morning call" pulse with 1567-nm central wavelength.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2017.2765686