H. Ahmad, J.W. Chiam, M.Z. Samion, M.K.A. Zaini, M.Z. Zulkifli, K. Thambiratnam
In this work, we successfully demonstrated an all-fiber, dual-wavelength holmium-doped fiber laser (HDFL) with a tunable wavelength spacing range of 8 nm to 24 nm. The HDFL utilizes a Lyot filter to obtain a stable dual wavelength output, with the Lyot filter being constructed from a polarizer, a 20 m polarizing maintaining fiber (PMF) and two polarization controllers (PCs). The dual-wavelength HDFL has an operating wavelength range from 2072.1 nm to 2097.2 nm and a maximum spacing of 24 nm between the lasing wavelengths as well as a signal-to-noise ratio of up to 45 dB and a side mode suppression ratio as low as 0.15 dB. The HDFL is highly stable, with the lasing output have a low power fluctuation of only 2.3 dB over a continuous operation period of 75 min. The proposed HDFL would have substantial applications as a low cost laser source for sensing applications beyond the 2 µm region, particularly those that require a control signal. © 2023 Astro Ltd
Photonics Research Center, University of Malaya, Kuala Lumpur, 50603, Malaysia; Universiti Kuala Lumpur British Malaysian Institute, 8, Selangor, Jln Sungai Pusu, Batu, 53100, Malaysia; Department of Physics, Faculty of Mathematics and Natural Sciences Universitas Negeri Malang, Jalan Semarang 5, Malang, 65145, Indonesia; IIUM Photonics and Quantum Research Centre (iPQC), Kulliyyah of Science, International Islamic University of Malaysia, Bandar Indera Mahkota Pahang, Kuantan, 25200, Malaysia; Physics Department, Kulliyyah of Science, International Islamic University of Malaysia, Bandar Indera Mahkota Pahang, Kuantan, 25200, Malaysia