Browsing by Subject "Saturable absorber"

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    MXene-Cr2C as a novel saturable absorber for mode-locking at 2.07 μm
    (Elsevier BV * North-Holland, 2025-07-21) Ahmad, Harith; Kamaruzzaman, Khalil; Samion, Muhamad Zharif; Yusoff, Norazriena; Ortaç, Bülend; Radzi, Zamri
    MXenes have been demonstrated as saturable absorbers for mode-locking in fiber laser systems operating from 1 to 2 μm wavelength. Despite that, there has been no utilization of MXene as a mode-locker at the extended 2 μm wavelength. In this work, we present the potential of MXene material (Cr2C) for mode-locking in a Holmium-doped fiber laser (HDFL). The Cr2C-SA had a saturation intensity of 1.7 MW/cm2 and a modulation depth of 14.2 %, respectively. Stable fundamental mode-locked pulses were realized at the pump power of 1.6 W. The mode-locked pulses had a repetition rate of 13.74 MHz, centered at 2077.54 nm, with a pulse duration of 1.75 ps. This study presented the first HDFL system to use MXene as a saturable absorber and the first utilization of Cr2C as a mode-locker.
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    O-band femtosecond mode-locked laser by using Ni-MOF in praseodymium-doped fluoride fiber
    (Elsevier BV * North-Holland, 2024-09-27) Ahmad, H.; Nizamani, B.; Samion, M. Z.; Mutlu, S.; Yilmaz, S. Savaskan; Arsu, N.; Thambiratnam, K.; Ortaç, Bülent
    This work reports an ultrafast mode-locked fiber laser at the less investigated region of the O-band using a nickel metal-organic framework (Ni-MOF), which works as a saturable absorber (SA). Ni-MOF was prepared using the high-power laser-induced method. A stable mode-locked laser of 450 fs pulse duration was obtained. The repetition rate and signal-to-noise ratio (SNR) were 0.408 MHz and 52.5 dB, while the lasers operate at a wavelength of 1298.1 nm. At the pump power of 88 mW, the mode-locked laser was characterized to have an average output power of 0.69 mW, corresponding to a pulse energy of 1.69 nJ and a pulse peak power of 3.53 kW. Additionally, harmonic mode-locked laser operation was also achieved above the pump power of 88 mW. With the harmonic mode-locked laser operation, the pulse repetition rate increased to 2.45 MHz when the pump power was 125.7 mW. To the author's knowledge, this is the first report of novel MOF material used as an SA in praseodymium-doped fluoride fiber (PDFF) laser.