Dark pulse mode-locked laser based on aluminum zinc oxide coated D-shape fiber as saturable absorber

• Main Authors: Nizamani, Bilal, Jafry, Afiq Arif Aminuddin, Fizza, Ghulam, Memon, Faisal Ahmed, Salam, Sameer, Najm, Mustafa Mohammed, Abdul Khudus, Muhammad Imran Mustafa, Hanafi, Effariza, Apsari, Retna, Harun, Sulaiman Wadi
• Format: Article
• Published: Taylor & Francis 2021
• Subjects: QC Physics; TA Engineering (General). Civil engineering (General)
• Online Access: http://eprints.um.edu.my/35326/

We have experimentally reported aluminum zinc oxide (AZO) as a novel saturable absorber to generate a mode-locked laser operating in dark pulsed regime. The D-shaped fiber was first prepared by side polishing a single-mode fiber to the 1 dB insertion loss. The AZO was dissolved in isopropyl alcohol and then deposited onto the D-shaped fiber by drop casting method. By carefully optimizing the polarization of the cavity, a dark pulse was achieved, which remained stable within the pump power of 65.7-101.35 mW. Pulse width was 220 ns, and the pulse repetition rate was 1.85 MHz.