| Summary: | 碩士 === 國防大學中正理工學院 === 應用物理研究所 === 93 === In recent years, the development of biomedical research has brought great commercial potential. Several fields of the biomedical research have high demand of the biomaterial survey tools. In contrast to the traditional analytical tool of the ultrafast laser (Ti:Sapphire, 800nm), the light source of the chromium forsterite(Cr:F) laser has deeper penetration depths for bio tissues and cells, and less scattering in biomaterials. In addition, three photon microscopy with Cr:F ultrafast laser has better resolutions of the bio image than two photon microscopy with Ti:sapphire ultrafast laser. In our research, we choose chromium forsterite crystal as a gain medium to build a continue-wave laser source, at a wavelength is of about 1.2~1.3 μm in the near infrared region. Especially, because of the long fluorescence lifetime and the broad fluorescence band, the chromium forsterite crystal is suitable for the future development of the Kerr-lens mode-locked femtosecond laser.
The research of this thesis contains three parts : (1) Design and set-up of a laser device. (2) Calculation of pumping parameters and the cavity analysis. (3) Determination of the laser performance and characteristics. The first part deals with the design and proper arrangement of the optical elements of the laser device device. The second part is related to theoretical calculations and experimental measurements which help us understand the pump mode and the cavity mode in the gain region. Finally, we measure the basic properties of our laser device, such as efficiencies, wavelengths turning range, the divergence angle, the threshold power.
Keywords: chromium forsterite(Cr:F), titanum sapphire (Ti:Sapphire), multi-photon microscopy, ultrafast laser, Kerr-lens mode-locked femtosecond laser, optical cavity.
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