近年來醫療美容的需求越來越廣泛，人們可能因為重大事故造成身體外表的損害或者對自己的容貌不夠滿意而尋求醫療美容的幫助，以此達成生理與心理的需求。醫療美容又以雷射的方式最為廣泛，像是以雷射除斑、除疤或是除毛等對於皮膚的醫療為重。因此本論文將研製1040 nm的長脈衝光纖雷射，首先架設光纖環形雷射，使用DFB雷射泵激摻鐿光纖產生放大自發輻射並製作環形共振腔使光子共振，我們測試改變摻鐿光纖長度、分光比對雷射的影響，最佳結果在摻鐿光纖長度為150 cm並且分光比為80/20時有著光信雜比(OSNR)為36.09dB與15.78 mW的最佳輸出結果，並且在加上光纖布拉格光柵後，光信雜比能夠提升至40.456 dB，接著基於環形雷射架構使用偏振疊加波鎖模的方式製作長脈衝雷射，當輸入功率為301.6 mW，在共振腔長為8.7 m時脈衝寬度為17 ns，脈衝重複率為18.5 MHz，換算後脈衝能量與尖峰功率為87.5 pJ與0.031 W，將共振腔增長至1054 m時，脈衝寬度為650 ns，脈衝重複率為181.8 kHz，換算後脈衝能量與尖峰功率為27.5 nJ與0.042 W，並以主振盪功率放大器的架構製作摻鐿光纖放大器，採用雙前向泵激的方式進行放大，並在輸出端加上模場轉換元件將大模場轉換為單模輸出，最終測試結果當兩顆泵激雷射電流為2.25 A時，摻鐿光纖長度為3 m時有著20.4 dB的最佳增益，最終輸出功率為505.7 mW，脈衝寬度為1.158 μs，脈衝重複率為181.1 kHz，換算後脈衝能量與尖峰功率為2.7 μJ與2.41 W，在動物實驗部分，透過不同輸出功率分別打在老鼠的背部，並在顯微鏡下觀察，在功率提升後將對老鼠造成淨膚的效果。

In recent years, the demand for medical cosmetology has become more and more extensive. People may seek medical cosmetology help because of major accidents causing physical damage or unsatisfactory appearance to meet their physical and psychological needs. Medical cosmetology is the most widely used method of laser, such as laser spot removal, scar removal or hair removal, etc. for skin care. Therefore, this paper will develop a long pulse fiber laser of 1040 nm. First, set up a fiber ring laser, use DFB laser to pump Ytterbium fiber to generate amplified spontaneous emission (ASE) and make a ring resonator to resonate the photons. We test to change the length of ytterbium fiber and splitting ratio on the laser, the best result is when the length of Ytterbium-doped fiber is 150 cm and the splitting ratio is 10/90, there is the best output result of OSNR of 39.354 dB and 5.341 mW. And after adding the fiber Bragg grating (FBG), The OSNR can be increased to 40.456 dB. And then a long pulse laser is made based on the ring laser architecture using polarization additive-pulse mode locking(P-APM). When the input power is 301.6 mW and the resonant cavity length is 8.7 m, the pulse width is 17 ns. The repetition rate is 18.5 MHz. After conversion, the pulse energy and peak power are 87.5 pJ and 0.031 W respectively. When the cavity is increased to 1054 m, the pulse width is 650 ns, and the pulse repetition rate is 181.8 kHz. After conversion, the pulse energy and peak power are 27.5 nJ and 0.042 W respectively. Ytterbium-doped fiber amplifier is made with the structure of master oscillator power amplifier (MOPA). Double forward pumping is adopted for amplification, and the mode field adapter is added at the output end to convert the large mode field into single mode output. The final test results when the two pump laser currents are 2.25 A, the Ytterbium-doped fiber has the best gain of 16.064 dB when the length is 3 m, the final output power is 505.7 mW, the pulse width is 1.158 μs, and the pulse repetition rate is 181.1 kHz, the converted pulse energy and peak power are 2.7 μJ and 2.41 W respectively, which is expected to be used in skin treatment. In the animal experiment part, the rats were hit on the backs of rats with different output powers and observed under a microscope. After the power was increased, the rats would have a skin-cleaning effect.

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