Multiwall carbon nanotube polyvinyl alcohol-based saturable absorber in passively Q-switched fiber laser

Abstract

In this work, we demonstrated a compact Q-switched erbium-doped fiber laser capable of generating high-energy pulses using a newly developed multiwall carbon nanotube (CNT) polyvinyl alcohol (PVA) thin film based saturable absorber. Q-switched pulse operation is obtained by sandwiching the thin film between two fiber ferrules forming a saturable absorber. A saturable absorber with 1.25 wt. % of PVA concentration shows a consistency in generating pulsed laser with a good range of tunable repetition rate, shortest pulse width, and produces a high pulse energy and peak power. The pulse train generated has a maximum repetition rate of 29.9 kHz with a corresponding pulse width of 3.49 μs as a function of maximum pump power of 32.15 mW. The maximum average output power of the Q-switched fiber laser system is 1.49 mW, which translates to a pulse energy of 49.8 nJ. The proposed method of multiwall CNT/PVA thin film fabrication is low in cost and involves uncomplicated processes.

The synergistic effect of CNTs-polymeric surfactant on the properties of concrete nanocomposites: Comparative study

“…However, it is reported in the literature that there is a peak here. 34,35 The XPS spectra given in Figure 3(d Steps of the production procedure applied for the samples produced in this study.…”

“…The peak at 1400 cm À1 was not seen since it overlapped with the peak of D band. However, it is reported in the literature that there is a peak here 34,35. The XPS spectra given in Figure3(d) shows that CNTs were covered with PVA.…”

A switchable femtosecond and picosecond soliton fiber laser mode-locked by carbon nanotubes

“…In these works, the pulse durations are from several tens of femtoseconds to hundreds of picoseconds, fully exploiting the merits of SWNTs [50,51]. However, the most investigators are committed to achieve only femtosecond or picosecond solitons in one laser system [52,53]. Recently, Liu et al realized a versatile multi-wavelength mode-locked fiber laser based on three fiber Bragg gratings (FBGs) [54].…”

Optically Modulated Tunable O-Band Praseodymium-Doped Fluoride Fiber Laser Utilizing Multi-Walled Carbon Nanotube Saturable Absorber*

“…The fabrication of the MWCNT based SA has been discussed in detail. [30] The proposed laser is initially operated without the TBPF and the SA in the cavity, and in this configuration, a continuous wave (CW) threshold power of 218 mW is observed. With the SA incorporated into the cavity, a modulated output is now obtained at a threshold power of 511 mW.…”