Tunable passively Q-switched ultranarrow linewidth erbium-doped fiber laser

• Main Authors: Zulkifli, Mohd Zamani, Muhammad, Farah Diana, Mohd Azri, M. F., Mohd Yusof, M. K., Hamdan, K. Z., Samsudin, S. A., Yasin, Moh
• Format: Article
• Language: English; English
• Published: Elsevier B.V. 2020
• Subjects: Q Science (General); QC Physics
• Online Access: http://irep.iium.edu.my/82213/1/82213_Tunable%20passively%20Q-switched%20ultranarrow%20linewidth%20erbium-doped%20fiber%20laser_full%20text.pdf; http://irep.iium.edu.my/82213/2/82213_Tunable%20passively%20Q-switched%20ultranarrow%20linewidth%20erbium-doped%20fiber%20laser_scopus.pdf; http://irep.iium.edu.my/82213/; https://www.sciencedirect.com/science/article/pii/S2211379719333327?via%3Dihub
• Institution: Universiti Islam Antarabangsa Malaysia

A tunable passively Q-switched erbium-doped fiber laser with ultranarrow linewidth is proposed and demonstrated. With the single wall carbon nanotubes (SWCNTs) as the passive Q-switch, the ultranarrow linewidth laser operation is realized based on spectral filtering effect. using an ultranarrow tunable bandpass filter (UNTBF). The Q-switched laser spectrum is tunable from 1525 to 1561 nm, covering a wavelength range of 36 nm. At 1545 nm, the highest repetition rate of ~38 kHz and the lowest pulse width of 1.15 μs are obtained, with the corresponding pulse energy of approximately 0.18 nJ. The linewidth measurement using self-heterodyne technique yields a linewidth value of 17.5 kHz, which may be the narrowest linewidth for a Q-switched fiber laser to the best of our knowledge.