Abstract
A novel saturable absorber (SA) was fabricated by coating the topological insulator (TI) film on microfiber using pulsed laser deposition (PLD) method. The TISA device had an insertion loss of ~1.25 dB, a saturable intensity of 26.7 MW/cm2, a modulation depth of ~5.7%, and a nonsaturable loss of 20.5%. Upon employing this SA device, we established a passively mode-locked EDFL and achieved nearly free-chirped soliton pulse with 286 fs of pulse duration and >73 dB of signal to noise ratio (SNR). This result clearly evidences that the PLD is an effective scheme for practical SA device fabrication.
Highlights
A novel saturable absorber (SA) was fabricated by coating the topological insulator (TI) film on microfiber using pulsed laser deposition (PLD) method
In mode-locking, carbon nanotubes (CNTs) is an intrinsic selective-broadband SA depending on its tube-diameter, which usually leads to a larger non-saturable loss for obtaining a broadband operation
The SA device based on the evanescent wave interaction is an effective approach to achieve mode-locked fiber laser[25,26]
Summary
A practical topological insulator saturable absorber for mode-locked fiber laser A novel saturable absorber (SA) was fabricated by coating the topological insulator (TI) film on microfiber using pulsed laser deposition (PLD) method. The SA device based on the evanescent wave interaction is an effective approach to achieve mode-locked fiber laser[25,26].
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