Abstract
A passively Q-switched fiber laser using a Saturable Absorber (SA) fabricated from a new Poly (N-vinyl Carbazole) – Polypyrrole/Graphene Oxide (PNVC-PPy/GO) nanocomposite material deposited on a tapered fiber is proposed and demonstrated. The PNVC-PPy/GO composition is deposited along a 3mm length of the 6.5cm tapered fiber which has a tapered waist of 8µm. Q-switched pulses are obtained with repetition rates of 25.15–42.7kHz and pulse widths of 5.74–2.48μs over a pump power range of 12.8–40.0mW. A maximum average power of 0.19mW and pulse energy of 4.43nJ are also observed. The proposed Q-switched maintains advantages of a simple design and low fabrication cost while at the same time generating high quality Q-switched pulses.
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