摘要
本論文分為兩部分，在第一部份，利用矽酸鹽化學鍵結解決高功率脈衝光纖雷射的端面因為光強度太大而產生熱損壞的問題。一般使用大孔徑光纖纖核降低光強度解決端面的熱損壞問題，此類方法會產生多模態(橫模)雷射光輸出降低光品質，或者在光纖出口熔接一段沒有纖核的光纖放大光束，此方式會降低了此段光纖的彎曲容忍度造成應用上的困難。有別於上述方法，我們於光纖端面利用矽酸鹽鍵結黏著光學玻璃作為保護元件，在介面折射率匹配的情況下將其出光光斑放大減少光強度來避免端面的熱損壞，維持單模輸出且有高機動性與低成本，利用此保護元件，我們成功使1 kW脈衝光纖雷射產生穩定輸出。
第二部份，在光纖濾光元件的研發方面：由於光纖光柵容易受熱
影響而降低濾光效率，且製作成本昂貴。我們提出一套新穎且簡單的元件製作方法，取代高製作成本的布拉格光纖光柵 (Fiber Bragg Grating)，即藉由將有濾光功能的光學膜鍍於光纖端面並用矽酸鹽鍵結鍍膜光纖作為雷射共振腔的高反射偶合端，此鍍膜端反射雷射光源且讓幫浦光穿透，量出此元件對幫浦光的穿透效率為88 ％，並用此元件架設出功率3.17 W 波長1.1 μm的CW雷射。

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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