Abstract
Covalent organic frameworks (COFs) are materials that can be used in a wide variety of applications because of the nature of their ordered, crystalline, low-density, and porous structures. This work demonstrates the use of a π-electron-extended porphyrin/pyrene-linked COF (PorPh-PyTA-COF) as a saturable absorber (SA) in the 1.5 μm spectral region. The nonlinear optical absorption properties of this COF SA were studied and demonstrated a modulation depth of 0.8 % and saturation intensity of 0.5 kW/cm2. Using the COF SA, the operation of a mode-locked erbium-doped fiber laser was realized with a pulse duration of 506 fs at 1570 nm. This is believed to be the first report of a COF-based mode-locked fiber laser operating in the near-infrared spectral range. Additionally, a 3.7 dB polarization-dependent loss was measured in the COF SA and its role in the mode-locking process was also discussed.
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