Sodium carbonate modulated ultrashort mode-locked stretched pulses in an erbium-doped fiber laser

Author:

Najm Mustafa Mohammed,Zhang Pei1,Al-Azzawi Alabbas A.23,Abdullah Mohammed Najm4,Yasin Moh5,Harun Sulaiman WadiORCID

Affiliation:

1. Hunan First Normal University

2. Ministry of Higher Education and Scientific Research

3. Al-Esraa University College

4. University of Technology

5. Faculty of Science and Technology

Abstract

In this paper, we propose a new, to the best of our knowledge, saturable absorber (SA) based on sodium carbonate (Na2CO3) for producing an ultrafast mode-locked stretched pulse in a passively erbium-doped fiber laser at near-zero dispersion. The solid film of a Na2CO3-SA was fabricated by the drop-casting method using polyvinyl alcohol as a host polymer. The modulation depth of the proposed SA, which was measured by a balanced twin detector technique, was 2.3% with saturation intensity of 181MW/cm2. The mode-locking operation of the EDFL-based Na2CO3-SA was observed at a pump power of 117 mW. A stable stretched pulse was generated by using the proposed Na2CO3-SA. The laser can generate pulses with a repetition rate and duration of 1.87 MHz and 820 fs, respectively, within a bandwidth of 6.6 nm. The single pulse energy reaches up to 5 nJ, which is equivalent to the average output power of 9.3 mW. Finally, to the best of our knowledge, this is the first report on using the Na2CO3-SA for generating a stretched-pulse mode-locked fiber laser.

Funder

Scientific Research Foundation of Hunan Provincial Education Department

Science and Technology Program of Hunan Province

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering

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