【摘要】：2μm波段光纖激光器在激光醫(yī)療、自由空間光通訊、中紅外泵浦等領域具有廣泛的應用前景。其通常是由激光泵浦摻銩或摻鈥光纖得到2μm波段增益譜,通過濾波器產(chǎn)生多波長激光輸出。本文使用摻銩光纖作為增益介質(zhì),設計分析了幾種不同結(jié)構(gòu)的多波長摻銩光纖激光器,分別實現(xiàn)了2μm波段多波長激光輸出與多波長鎖模激光輸出,主要研究內(nèi)容概括為以下幾點:1.研究了摻銩光纖的增益譜特性。通過使用1565nm半導體激光器泵浦摻銩光纖得到增益范圍1750-2200nm的增益譜。分析了不同泵浦功率、不同光纖長度對增益譜輸出特性的影響。2.設計了兩種以多模干涉濾波結(jié)構(gòu)為基礎的2μm波段多波長光纖激光器。采用Sagnac環(huán)和多模干涉濾波器復合得到了雙波長間隔3nm-80nm可調(diào)諧輸出,在不同泵浦功率和偏振態(tài)下可得到1-4個波長的激光輸出。通過將多模干涉濾波結(jié)構(gòu)與梳狀濾波器復合,得到了雙波長間隔調(diào)諧范圍26.7nm的激光輸出,激光線寬7.5MHz。3.設計了基于非線性偏振旋轉(zhuǎn)效應的2μm波段多波長光纖激光器,得到了1-5個波長的穩(wěn)定激光輸出。通過對腔內(nèi)增加雙折射光纖,增強腔內(nèi)雙折射效應,得到127nm的單波長可調(diào)諧輸出,在不同偏振態(tài)下也可實現(xiàn)1-5個波長的激光輸出。4.設計了2μm波段多波長鎖模光纖激光器。實現(xiàn)了雙波長鎖模脈沖輸出,脈寬72ps,重頻12MHz。通過對腔內(nèi)非線性效應的優(yōu)化,得到調(diào)諧范圍87nm的雙波長鎖模輸出,脈寬75ps,重頻3MHz。
[Abstract]:The 2 渭 m band fiber laser has a wide application prospect in the fields of laser medical treatment, free space optical communication, mid-infrared pumping and so on. The gain spectrum of 2 渭 m band is usually obtained by laser pumped thulium doped or holmium doped fiber, and the multi-wavelength laser output is generated by the filter. In this paper, using thulium doped fiber as gain medium, several kinds of multi wavelength thulium doped fiber lasers with different structures are designed and analyzed. The output of 2 渭 m wavelength multi wavelength laser and multi wavelength mode-locked laser are realized, respectively. The main research contents are summarized as follows: 1. The gain spectrum characteristics of thulium doped fiber are studied. The gain spectrum of 1750-2200nm in gain range is obtained by pumping thulium doped fiber with 1565nm semiconductor laser. The effect of different pump power and fiber length on the output characteristics of gain spectrum is analyzed. Two kinds of 2 渭 m wavelength multiwavelength fiber lasers based on multimode interference filter structure are designed. The dual-wavelength interval 3nm-80nm tunable output is obtained by using Sagnac loop and multi-mode interference filter. The laser output of 1-4 wavelengths can be obtained under different pump power and polarization state. By combining the multimode interference filter structure with the comb filter, the laser output of 26.7nm with dual wavelength interval tuning range is obtained. The laser linewidth is 7.5 MHz 路3. A 2 渭 m wavelength multiwavelength fiber laser based on nonlinear polarization rotation effect is designed, and a stable output of 1-5 wavelengths is obtained. The single wavelength tunable output of 127nm can be obtained by adding birefringent fiber to the cavity and the birefringence effect can be enhanced. The laser output of 1-5 wavelengths can also be realized in different polarization states. A 2 渭 m multiwavelength mode-locked fiber laser is designed. Double wavelength mode-locked pulse output is realized, pulse width is 72 pss, repetition rate is 12 MHz. By optimizing the intracavity nonlinear effect, the tunable range of 87nm is obtained with a dual wavelength mode-locked output, a pulse width of 75 pss and a repetition frequency of 3 MHz.
【學位授予單位】：長春理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN248

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