研究目的
To explore new materials to act as saturable absorbers (SAs) for passively Q-switched fiber lasers, which can find a multitude of applications in the areas that require a high pulse energy source, such as remote sensing, biomedical diagnostics, spectroscopy, communications, material processing and manufacturing.
研究成果
In this work, a Q-switched EDFL is successfully demonstrated by using ZnO nanoparticles-based SA with simple deposition method. The SA device is prepared by first dissolving the ZnO nanoparticle powder in ethanol and subsequently deposited onto the SMFF via adhesion effect assisted by evaporation process. The ZnO-deposited SMFF is then connected to another clean SMFF to be integrated into the EDFL cavity. Self-started and stable Q-switching in the EDFL is achieved at a low threshold power of 20.24 mW. At the maximum pump power of 48.58 mW, the Q-switched EDFL generates the central wavelength, pulse repetition rate, pulse width, average output power, and pulse energy of 1558.32 nm, 25.59 kHz, 3.65 μs, 0.46 mW, and 18.13 nJ, respectively.
研究不足
The low thermal damage threshold of our ZnO-based SA might be attributed to some parameters that are not well optimized during the SA fabrication procedure, such as the dispersion and concentration of ZnO nanopowder in ethanol solution, as well as the thickness of the ZnO layer on the fiber ferrule.
1：Experimental Design and Method Selection:
The study proposes a simple approach to the fabrication of ZnO nanoparticles-based SA via evaporation technique to adhere the ZnO nanopowder onto the fiber ferrule.
2：Sample Selection and Data Sources:
The ZnO used is originally in the form of powder with a nanoparticle size of ～
3：88 ± 87 nm. List of Experimental Equipment and Materials:
A section of
4：5-m Lucent Technologies HP980 erbium-doped fiber (EDF) is pumped by a 980-nm laser diode (LD) through a 980-nm port of a fused 980-/1550-nm wavelength division multiplexer (WDM). Experimental Procedures and Operational Workflow:
The ZnO nanopowder is first dissolved in a few drops of ethanol on a weighing paper. A single mode fiber ferrule (SMFF) with a clean tip is dipped slightly into the suspension, whereby through the adhesion effect, the ZnO nanopowder will stick to the facet of the SMFF with the help of the ethanol. The SMFF is then left to dry for a few seconds to form a layer of ZnO on the SMFF surface through evaporation process to remove the ethanol residue. The SMFF with the deposited ZnO is then connected to another clean SMFF by using a fiber adaptor to form an SA assembly.
5：Data Analysis Methods:
The output spectrum of the generated Q-switched laser is measured using a Yokogawa AQ6370B Optical Spectrum Analyzer (OSA) with a resolution of 0.02 nm. The pulse train properties of the Q-switched pulses are analyzed by making use of an oscilloscope (Tektronix TDS 3012C) together with a Thorlabs SIR51856 Lightwave Detector for optical-to-electrical conversion in place of the OSA.
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