本文選題：半導體泵浦　切入點：摻鏑　出處：《南京理工大學》2017年碩士論文

【摘要】：黃光激光器在熒光顯微成像、流式細胞術、眼科光凝等生物醫(yī)學領域有著重要的應用前景。近年來,LD泵浦的全固態(tài)黃光激光器發(fā)展迅速,高穩(wěn)定性、高效率、高光束質量的全固態(tài)黃光激光器是當前激光領域內(nèi)的研究熱點。目前的全固態(tài)黃光激光器面臨著一個嚴峻的問題:絕大多數(shù)黃光激光器依賴于通過紅外激光的非線性頻率轉換方式實現(xiàn)。這就造成了,一方面,非線性轉換過程中基頻光模式競爭導致黃光輸出功率的穩(wěn)定性較差、光束質量不佳;另一方面,系統(tǒng)的復雜程度直接導致了激光器的體積較大,從而對激光器的可靠性造成了嚴重的影響,難以滿足實際應用的要求。本文旨在提出一種實現(xiàn)穩(wěn)定性好、體積小的醫(yī)用黃光激光器的新思路。采用半導體泵浦摻Dy3+激光介質的一步式方案,實現(xiàn)高穩(wěn)定性、小體積、高亮度的黃光激光輸出。主要做了如下研究工作:理論方面:探索一種高穩(wěn)定性、小體積全固態(tài)黃光激光器的實現(xiàn)方法。根據(jù)摻Dy3+激光介質的特殊能級結構,采用半導體激光泵浦,利用4Fg/2→6H13/2的能級躍遷,無需非線性頻率轉化,直接可以獲得黃光波段的激光,從根本上解決困擾全固態(tài)黃光激光器的穩(wěn)定性問題。實驗方面:首先,對比分析Dy:YAG單晶、Dy:YAG陶瓷和Dy:BSO單晶的光學性能;然后,設計對熱效應不靈敏的諧振腔,并優(yōu)化泵浦光和振蕩光之間的模式匹配;最后,在理論分析和數(shù)值模擬的基礎上,首次在國內(nèi)通過Dy:YAG單晶實現(xiàn)了全固態(tài)582.7 nm黃光激光輸出。
[Abstract]:Yellow laser has an important application prospect in the fields of fluorescence microscopic imaging, flow cytometry, ophthalmic photocoagulation and other biomedical fields.In recent years, the all-solid-state yellow laser pumped by LD-pumped laser is a hot spot in the field of laser field, with rapid development, high stability, high efficiency and high beam quality.At present, the all-solid-state yellow laser is faced with a severe problem: most yellow lasers depend on the nonlinear frequency conversion mode of infrared laser.On the one hand, the fundamental frequency mode competition in the nonlinear conversion process leads to poor stability of the yellow light output power and poor beam quality; on the other hand, the complexity of the system directly leads to the larger volume of the laser.Thus, the reliability of the laser is seriously affected and it is difficult to meet the requirements of practical application.In this paper, a new idea is proposed to realize the good stability and small volume of medical yellow laser.A one step scheme of semiconductor pumped Dy3 doped laser medium is used to realize the yellow laser output with high stability, small volume and high brightness.The main work is as follows: in theory, a high stability, small volume all-solid-state yellow laser is studied.According to the special energy level structure of Dy3 doped laser medium, the laser in yellow wave band can be directly obtained by using semiconductor laser pump and the energy level transition of 4Fg/2 6H13/2 without nonlinear frequency conversion.The stability problem of all-solid-state yellow laser is solved fundamentally.Experimental aspects: firstly, the optical properties of Dy:YAG single crystal Dy: YAG ceramics and Dy:BSO single crystal are compared and analyzed; then, the resonator which is not sensitive to thermal effect is designed, and the mode matching between pump light and oscillating light is optimized.On the basis of theoretical analysis and numerical simulation, the all-solid-state 582.7 nm yellow laser output is realized by Dy:YAG single crystal in China for the first time.
【學位授予單位】：南京理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN248

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本文編號：1694301