| Summary: | 碩士 === 國立中央大學 === 光電科學研究所 === 99 === Today, there are many different technologies to produce the corresponding output of the laser spectrum, but most of these technologies can’t control the spectral width result in the limit of the application. For example, such applications in optical communications need the narrower bandwidth of a particular signal to be the data transmission. Therefore, we can see many technologies of the narrowing bandwidth have been developed. However, these techniques have shortcomings. The use of Volume Bragg Grating is a more clever way, both narrow bandwidth and avoid the loss of energy that we can see a lot of applications in the literature.
Using periodically poled lithium niobate to be optical parametric oscillator (OPO) and Q-switched modulator is a mature technology. This thesis also successfully integrated the two components on the same chip, and demonstrated a spectral narrowed intracavity OPO (IOPO) in a Q-switched Nd:YVO4 laser with a 1064-nm Volume Bragg Grating as the pump laser mirror and another 1560-nm Volume Bragg Grating as the OPO mirror which has been a factor of 16.35 narrower than that obtained in a typical IOPO system using two dielectric mirrors.
Chapter one will introduce the experimental background and the motivation and chapter two described the theory and working principle about the device in my thesis, such as quasi-phase matched, active electro-optic modulator and Bragg diffraction device; Chapter three will introduce how to make the distribution of periodic 2D active Q-modulation components and optical parametric oscillator. Chapter four will use experiment to verify the 2D PPLN with VBG that the device can achieve the narrow bandwidth optical communication light source. Chapter five is a summary of proposed research in this thesis and future prospects.
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