Sodium carbonate modulated ultrashort mode-locked stretched pulses in an erbium-doped fiber laser
Document Type
Article
Publication Date
9-1-2023
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 181 MW/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. (c) 2023 Optica Publishing Group
Divisions
sch_ecs
Funders
Hunan Provincial Education Department (22A0544),Science and Technology Program of Hunan Province (2021RC5012)
Publication Title
Applied Optics
Volume
62
Issue
26
Publisher
Optica Publishing Group
Publisher Location
2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA