| Summary: | 碩士 === 國立成功大學 === 光電科學與工程研究所 === 97 === In this paper, we divided the research of fiber lasers into two parts. First, in fiber lasers, we solved the damage problem present at the output facet in high-peak power laser systems. Unlike other approaches, such as the use of a large core fiber, which would produce multimode laser output, or the use of fusion-splicing coreless end caps to increase the spot size at the silica-air interface, which would limit the allowable bend radius of the fiber, in this paper, we bonded an optical flat at the fiber exit facet to decrease intensity and to maintain good beam quality with a matched refraction index of the bond. We also showed that the output power efficiency through the bond could reach up to 96 %. The bond could increase the reliability of a high-peak power fiber laser demonstrated beyond 1 kW with a 70 nanosecond pulse width and a repetition rate of 80 kHz.
Secondly, we extended the application of the bonding process to replace costly Fiber Bragg Grating (FBG) with the optical filter by a silicate bonding process. We set up a simple fiber laser system with the optical filter and showed the transmission efficiency of the filter could reach up to 88 % and operated the bond in the CW fiber laser system to produce 3.17 W laser power at 1.1 μm. The low manufacturing cost and good temperature stability made the optical filter an excellent candidate for FBG.
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