Abstract
The use of silver (Ag)-nanoparticle as saturable absorber (SA) to induce tunable Q-switched fiber laser in C-band is demonstrated. The Ag-nanoparticle SA exhibits modulation depth of 31.6% and saturation intensity of 0.54MWcm−2. The SA is integrated into the laser cavity by sandwiching it between two fiber ferrules. Lasing in CW region starts at 10mW, whereas stable self-starting Q-switching with a central wavelength of 1558.4nm begins at 20mW. As the pump power increases, the repetition rate varies from 10.5kHz to 24.4kHz and the narrowest pulse width obtained is around 6.5µs. The Q-switched laser has a tuning range of 27.3nm (1552.9–1580.2nm). The stability of the pulse is verified from the radio-freqeuncy (RF) spectrum with a measured signal-to-noise ratio (SNR) of 46.22dB. The ability of Ag-nanoparticle as an effective SA may lead to further development of pulsed fiber laser in the field of photonics.
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