新型全固态飞秒激光器的研究及其超连续光谱的产生
发布时间：2018-09-09 10:42
【摘要】：基于二极管泵浦(LD)泵浦产生的全固态超快激光因其独有的优点,例如高效率,低成本,结构紧凑等,具有重要的研究意义,也具有广泛的应用价值,一直是激光技术领域的研究前沿和热点。本论文致力于新型全固态超快激光器和其超连续光谱的实验研究,力求做到脉宽更短、能量更高、使用更方便、运行更稳定并且能应用到产生跨倍频程的超连续光谱上。另外本文也介绍了国际上基于全固态飞秒激光器产生超连续光谱的发展情况。超短脉冲产生的超连续光谱目前也是非线性光学的一个重要分支,超连续光谱理论和实验技术的不断进步推动了精密计量学,超精细光谱学,现代生物医学,超高速光通信等领域的发展。目前有国内外主要有两种方式产生超连续光谱,一种是通过微纳结构光纤即光子晶体光纤,除此之外国外还报道了一些将超短脉冲耦合进拉锥光纤产生超连续光的实验。拉锥光纤是国际上一种新型的光纤后处理技术,实验中通过将光纤加热,拉锥可以改变光纤的形状,性能,制作各种各样的光纤器件。这项技术可以使普通光纤或光子晶体光纤的应用更加丰富。本文的主要内容和创新成果主要有以下几个方面:1.使用多种掺杂Yb~(3+)离子的晶体作为增益介质研制飞秒量级的全固态激光器。其中Yb:YGG晶体和现在已经实现商业化的Yb:YAG晶体具有相近的热力学和机械性能,其荧光带宽是Yb:YAG的四倍,达到22nm。理论上此晶体可以支持激光器产生亚百飞秒的脉冲。在本实验中,采用被动锁模技术的激光最终得到了196fs的激光脉冲,功率在300m W。此外也采用了Yb:YCOB和Yb:CYA晶体做增益介质,也使用被动锁模技术研制出飞秒量级锁模激光器。2.得到了Yb:YCOB激光器产生的跨倍频程的超连续光谱,光谱范围在550nm-1350nm。首先根据拉锥光纤这一新型光纤处理技术自主搭建了拉锥光纤仪,将普通光纤通过拉锥变成拉锥光纤,然后使用自己研制的新型Yb:YCOB飞秒固态激光器通过拉锥光纤的光谱展宽能力,得到跨倍频程的超连续光谱。基于此结果讨论了将此实验设备应用在研制新型光学频率梳系统的前景和展望。
[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.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：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.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN248
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