| Summary: | 碩士 === 國立成功大學 === 工程科學系碩博士班 === 101 === In this thesis, a three-dimensional (3D) nonlinear optical endoscope with the depth scanning capability has been developed. It includes a developed 2D fiber-optic scanning endoscope and combines with a micro-motor for axial scanning. Therefore, it provides 3D nonlinear optical images such as two-photon excitation fluorescence and second harmonic generation. The developed 2D scanning probe includes a double clad fiber to develop the laser pulses and collect nonlinear optical signal, a spiral fiber scanner forced by a piezoelectric tube, an assembly of three miniature achromatic lenses to reduce the focal shift, and a micro-motor and some z-axis components for achieving the depth scanning. A pair of double prisms can produce the negative group velocity dispersion mainly from the fiber to compensate the dispersion.
In the 2D scanning tube, a spiral scanning pattern is utilized to drive the fiber cantilever to obtain 2D nonlinear optical images. The field of view is approximately 60 μm in diameter, the pixels are 273*273, the frame rate is 5 Hz, and the resonant frequency is 855 Hz. The 2D scanning tube is housed with a micro-motor for z-axis motion. Furthermore, all components are integrated into a 3D nonlinear optical endoscope. The diameter of the probe is 6 mm and the length is 6.4 cm. The micro-motor achieves axial scanning. Finally, the 3D nonlinear optical images are obtained by a compact, feasible, and fiber-based endoscope.
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