Mode-locked near-infrared thulium doped fibre laser using evanescent field effect with Bi2O3 saturable absorber. (26th March 2019)

• Record Type: Journal Article
• Authors: Ahmad, H; Monajemi, H; Thambiratnam, K; Ismail, M F
• Is Part Of: Laser physics. Volume 29:Number 5(2019)
• Publication Date: 2019-03-26
• Subjects: thulium doped fibre laser -- Bi2O3 saturable absorber -- evanescent field effect; Lasers -- Periodicals; 621.36605
• DOI: 10.1088/1555-6611/ab0d10
• Languages: English
• ISSNs: 1054-660X

Abstract

Abstract: Using the evanescent field effect, a high power passively mode-locked laser with a pulse duration of 1.85 ps and the pulse energy of 13.15 pJ is demonstrated. A Bi2 O3 solution is used as a saturable absorber (SA) on a side polished fibre incorporated into a thulium doped fibre laser cavity for operation in the mid-infrared range. The 37.61% SA has a modulation depth and creates a highly stable mode-locked pulse output with a short pulse duration. The calculated net cavity dispersion at central wavelength is −1.4 ps 2, indicating operation is in the anomalous dispersion regime and confirmed by the presence of Kelly's side-bands observed in the generated optical spectrum. Radio frequency analysis reveals a high signal to noise ratio, making this laser stable for use in telecommunication systems.