| Summary: | 碩士 === 國立臺北科技大學 === 光電工程系 === 106 === The laboratory has previously completed the use of quantum dot films and nanoparticle films to produce new Q-switched fiber lasers, but the three-nano-particle nanoparticle film loses the role of Q-switched lasers at high pump power. In this paper, the experimental structure of the polarization controller is removed, and stable pulse energy can be obtained. In order to better understand the characteristics of the nanoparticle film, two nanoparticle films were used as the saturated absorber. It was found that the range of action of the three nanoparticle films in the same system was similar, about half of the pump power threshold ratio.
In the Q-switched fiber laser system with a wavelength of 1.55μm, this paper successfully combines two nano-particle films and a quantum dot film into a new saturated absorber to generate a new Q-switched laser with a pump power of 71.7. ~176.4 (mW), the maximum output power of 7.49mW, and the maximum output pulse energy of 197nJ, the pulse time can be as short as 2.8μs, the repetition frequency is between 17.03kHz and 44.05kHz, and a stable pulse energy output with an increase in pump power.
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