新型全固態(tài)飛秒激光器的研究及其超連續(xù)光譜的產(chǎn)生
發(fā)布時間：2018-09-09 10:42
【摘要】：基于二極管泵浦(LD)泵浦產(chǎn)生的全固態(tài)超快激光因其獨有的優(yōu)點,例如高效率,低成本,結(jié)構(gòu)緊湊等,具有重要的研究意義,也具有廣泛的應用價值,一直是激光技術(shù)領(lǐng)域的研究前沿和熱點。本論文致力于新型全固態(tài)超快激光器和其超連續(xù)光譜的實驗研究,力求做到脈寬更短、能量更高、使用更方便、運行更穩(wěn)定并且能應用到產(chǎn)生跨倍頻程的超連續(xù)光譜上。另外本文也介紹了國際上基于全固態(tài)飛秒激光器產(chǎn)生超連續(xù)光譜的發(fā)展情況。超短脈沖產(chǎn)生的超連續(xù)光譜目前也是非線性光學的一個重要分支,超連續(xù)光譜理論和實驗技術(shù)的不斷進步推動了精密計量學,超精細光譜學,現(xiàn)代生物醫(yī)學,超高速光通信等領(lǐng)域的發(fā)展。目前有國內(nèi)外主要有兩種方式產(chǎn)生超連續(xù)光譜,一種是通過微納結(jié)構(gòu)光纖即光子晶體光纖,除此之外國外還報道了一些將超短脈沖耦合進拉錐光纖產(chǎn)生超連續(xù)光的實驗。拉錐光纖是國際上一種新型的光纖后處理技術(shù),實驗中通過將光纖加熱,拉錐可以改變光纖的形狀,性能,制作各種各樣的光纖器件。這項技術(shù)可以使普通光纖或光子晶體光纖的應用更加豐富。本文的主要內(nèi)容和創(chuàng)新成果主要有以下幾個方面:1.使用多種摻雜Yb~(3+)離子的晶體作為增益介質(zhì)研制飛秒量級的全固態(tài)激光器。其中Yb:YGG晶體和現(xiàn)在已經(jīng)實現(xiàn)商業(yè)化的Yb:YAG晶體具有相近的熱力學和機械性能,其熒光帶寬是Yb:YAG的四倍,達到22nm。理論上此晶體可以支持激光器產(chǎn)生亞百飛秒的脈沖。在本實驗中,采用被動鎖模技術(shù)的激光最終得到了196fs的激光脈沖,功率在300m W。此外也采用了Yb:YCOB和Yb:CYA晶體做增益介質(zhì),也使用被動鎖模技術(shù)研制出飛秒量級鎖模激光器。2.得到了Yb:YCOB激光器產(chǎn)生的跨倍頻程的超連續(xù)光譜,光譜范圍在550nm-1350nm。首先根據(jù)拉錐光纖這一新型光纖處理技術(shù)自主搭建了拉錐光纖儀,將普通光纖通過拉錐變成拉錐光纖,然后使用自己研制的新型Yb:YCOB飛秒固態(tài)激光器通過拉錐光纖的光譜展寬能力,得到跨倍頻程的超連續(xù)光譜。基于此結(jié)果討論了將此實驗設(shè)備應用在研制新型光學頻率梳系統(tǒng)的前景和展望。
[Abstract]:The all-solid-state ultra-fast laser pumped by diode pumped (LD) has its unique advantages, such as high efficiency, low cost, compact structure and so on. It has always been the research frontier and hot spot in the field of laser technology. This thesis is devoted to the experimental study of a novel all-solid-state ultra-fast laser and its supercontinuum spectrum, which aims to achieve shorter pulse width, higher energy, more convenient operation, more stable operation and can be applied to the supercontinuum spectrum which produces cross-frequency doubling. In addition, the development of supercontinuum spectra based on all-solid-state femtosecond lasers is also introduced. Ultra-continuous spectrum produced by ultrashort pulse is also an important branch of nonlinear optics. The continuous progress of theory and experimental technology of hypercontinuum spectroscopy has promoted precision metrology, hyperfine spectroscopy and modern biomedicine. The development of super-high-speed optical communication and other fields. At present, there are two main ways to produce supercontinuum spectrum at home and abroad. One is photonic crystal fiber via micro-nano structure fiber. In addition, some experiments of coupling ultrashort pulse into tapered fiber to produce supercontinuum light have been reported abroad. Tapered fiber is a new type of fiber post-processing technology in the world. By heating the fiber the tapered fiber can change the shape and performance of the fiber and make a variety of optical fiber devices. This technique can enrich the application of ordinary fiber or photonic crystal fiber. The main contents and innovative achievements of this paper are as follows: 1. An all-solid-state laser with femtosecond order of magnitude is developed using a variety of crystals doped with Yb~ (3) ions as gain medium. The Yb:YGG crystal has the similar thermodynamic and mechanical properties as the Yb:YAG crystal which has been commercialized now. The fluorescence bandwidth of the crystal is four times that of Yb:YAG, reaching 22 nm. Theoretically, this crystal can support the laser to produce sub-100 femtosecond pulses. In this experiment, the laser pulse of 196fs is obtained by passive mode-locking technique, and the power is 300 MW. In addition, Yb:YCOB and Yb:CYA crystals are used as gain media, and femtosecond mode locked laser. 2 is also developed by passive mode-locking technique. The supercontinuum spectrum produced by Yb:YCOB laser is obtained. The spectral range is from 550 nm to 1350 nm. First of all, according to the new fiber processing technology, the tapered fiber instrument is built, and the ordinary fiber is turned into a tapered fiber through the tapered fiber. Then, a novel Yb:YCOB femtosecond solid-state laser is developed, and the spectral broadening ability of the tapered fiber is obtained by using the new solid-state laser. Based on the results, the prospect and prospect of applying the experimental equipment to the development of a new type of optical frequency comb system are discussed.
【學位授予單位】：中國石油大學(華東)
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN248
[Abstract]:The all-solid-state ultra-fast laser pumped by diode pumped (LD) has its unique advantages, such as high efficiency, low cost, compact structure and so on. It has always been the research frontier and hot spot in the field of laser technology. This thesis is devoted to the experimental study of a novel all-solid-state ultra-fast laser and its supercontinuum spectrum, which aims to achieve shorter pulse width, higher energy, more convenient operation, more stable operation and can be applied to the supercontinuum spectrum which produces cross-frequency doubling. In addition, the development of supercontinuum spectra based on all-solid-state femtosecond lasers is also introduced. Ultra-continuous spectrum produced by ultrashort pulse is also an important branch of nonlinear optics. The continuous progress of theory and experimental technology of hypercontinuum spectroscopy has promoted precision metrology, hyperfine spectroscopy and modern biomedicine. The development of super-high-speed optical communication and other fields. At present, there are two main ways to produce supercontinuum spectrum at home and abroad. One is photonic crystal fiber via micro-nano structure fiber. In addition, some experiments of coupling ultrashort pulse into tapered fiber to produce supercontinuum light have been reported abroad. Tapered fiber is a new type of fiber post-processing technology in the world. By heating the fiber the tapered fiber can change the shape and performance of the fiber and make a variety of optical fiber devices. This technique can enrich the application of ordinary fiber or photonic crystal fiber. The main contents and innovative achievements of this paper are as follows: 1. An all-solid-state laser with femtosecond order of magnitude is developed using a variety of crystals doped with Yb~ (3) ions as gain medium. The Yb:YGG crystal has the similar thermodynamic and mechanical properties as the Yb:YAG crystal which has been commercialized now. The fluorescence bandwidth of the crystal is four times that of Yb:YAG, reaching 22 nm. Theoretically, this crystal can support the laser to produce sub-100 femtosecond pulses. In this experiment, the laser pulse of 196fs is obtained by passive mode-locking technique, and the power is 300 MW. In addition, Yb:YCOB and Yb:CYA crystals are used as gain media, and femtosecond mode locked laser. 2 is also developed by passive mode-locking technique. The supercontinuum spectrum produced by Yb:YCOB laser is obtained. The spectral range is from 550 nm to 1350 nm. First of all, according to the new fiber processing technology, the tapered fiber instrument is built, and the ordinary fiber is turned into a tapered fiber through the tapered fiber. Then, a novel Yb:YCOB femtosecond solid-state laser is developed, and the spectral broadening ability of the tapered fiber is obtained by using the new solid-state laser. Based on the results, the prospect and prospect of applying the experimental equipment to the development of a new type of optical frequency comb system are discussed.
【學位授予單位】：中國石油大學(華東)
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN248
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