Low threshold L-band mode-locked ultrafast fiber laser assisted by microfiber-based carbon nanotube saturable absorber
| Autor: | E. K. Ng, K. Y. Lau, Mohd Adzir Mahdi, Zulfadzli Yusoff, Mohammed T. Alresheedi, M. H. Abu Bakar, Ahmad Fauzi Abas |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
business.product_category Physics::Optics 02 engineering and technology Carbon nanotube 01 natural sciences law.invention 010309 optics 020210 optoelectronics & photonics Optics law Fiber laser 0103 physical sciences Microfiber 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering Physical and Theoretical Chemistry business.industry Pulse duration Saturable absorption Laser Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Wavelength business Ultrashort pulse |
| Zdroj: | Optics Communications. 413:249-254 |
| ISSN: | 0030-4018 |
| DOI: | 10.1016/j.optcom.2017.12.056 |
| Popis: | We demonstrate a passively mode-locked erbium-doped fiber laser in L-band wavelength region with low mode-locking threshold employing a 1425 nm pump wavelength. The mode-locking regime is generated by microfiber-based saturable absorber using carbon nanotube-polymer composite in a ring cavity. This carbon nanotube saturable absorber shows saturation intensity of 9 MW/cm2. In this work, mode-locking laser threshold is observed at 36.4 mW pump power. At the maximum pump power of 107.6 mW, we obtain pulse duration at full-width half-maximum point of 490 fs and time bandwidth product of 0.33, which corresponds to 3-dB spectral bandwidth of 5.8 nm. The pulse repetition rate remains constant throughout the experiment at 5.8 MHz due to fixed cavity length of 35.5 m. Average output power and pulse energy of 10.8 mW and 1.92 nJ are attained respectively through a 30% laser output extracted from the mode-locked cavity. This work highlights the feasibility of attaining a low threshold mode-locked laser source to be employed as seed laser in L-band wavelength region. |
| Databáze: | OpenAIRE |
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