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Optical properties of distributed feedback waveguide lasers based on sol-gel glass.

机译：基于溶胶-凝胶玻璃的分布式反馈波导激光器的光学特性。

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摘要

Distributed feedback (DFB) waveguide laser based on sol-gel materials have generated much interest because of the versatility of sol-gel technique and the potential applications in integrated optics. In this dissertation, Optical properties of sol-gel waveguides based on zirconia materials with or without dye dopants have been investigated by spectroscopic ellipsometry (SE) in the wavelength range from 300 to 800 nm. Lasing characteristics of asymmetric and symmetric DFB waveguide lasers have also been studied.; Zirconia, zirconia-ORMOSIL and zirconia-titania-ORMOSIL films on silicon and glass substrates were prepared by sol-gel method with the thickness from 0.1 to 10 mum. The dispersion curves rose sharply at shorter wavelengths, as expected of typical shape of a dispersion curve near an electronic interband transition. By varying ORMOSIL ratio and the annealed temperature from room temperature to 500°C, the refractive indices changed from 1.53 to 2.15. The extinction coefficients was in the range from 1 x 10-4 to 1 x 10-3. Furthermore, some degree of inhomogeneity has been found in zirconia films when they were treated at the temperature over 200°C. The addition of ORMOSIL and titania improved the microstructure of the zirconia films, and made possible films as thick as 10 mum.; The complex refractive index of zirconia films doped with rhodamine 6G, rhodamine 640 and oxazine 725 was deduced from SE spectra using classical Lorentz model. The derived absorption spectra agreed well with those measured by spectrophotometer. Unlike the pure zirconia films, the spectra of refractive index for dye-doped films exhibited anomalous dispersion. Moreover, the SE spectra of the layered waveguide structures were analyzed by appropriate models. For the multilayer structure, the volume fraction of titania-silica in the interlayer was found to decrease with the initial thickness of the guiding films.; Highly homogeneous sol-gel zirconia and zirconia-ORMOSIL films doped with rhodamine 6G, rhodamine 640 and oxazine 725 on glass substrates have been used in a distributed feedback configuration to obtain tunable laser emission from yellow to near infrared region. As many as eight pairs of TE/TM waves corresponding to eight propagation modes were simultaneously produced by circularly polarized crossing beams in a R6G-doped zirconia-titania-ORMOSIL waveguide laser of 6.7 mum thickness. Symmetric waveguide laser with guiding film of 0.1 mum was also achieved by using a cover layer of sol-gel titania-silica whose refractive index matches that of the glass substrate. Furthermore, the photostability of the R6G and R640 in different sol-gel hosts were investigated. Compared with titania-silica, zirconia-ORMOSIL and zirconia-titania-ORMOSIL, zirconia seemed ideal as a host matrix for functional organic dopants in view of stable lasing emission and high photostability.
机译：基于溶胶-凝胶材料的分布式反馈（DFB）波导激光器由于溶胶-凝胶技术的多功能性以及在集成光学中的潜在应用而引起了人们的极大兴趣。本文通过椭圆偏振光谱法（SE）在300〜800nm波长范围内研究了基于氧化锆材料的溶胶-凝胶波导的光学性能。还研究了非对称和对称DFB波导激光器的激光特性。通过溶胶-凝胶法在硅和玻璃基板上制备氧化锆，氧化锆-ORMOSIL和氧化锆-二氧化钛-ORMOSIL膜，其厚度为0.1至10μm。如在电子带间跃迁附近的色散曲线的典型形状所预期的，色散曲线在较短的波长处急剧上升。通过将ORMOSIL比和退火温度从室温更改为500°C，折射率从1.53变为2.15。消光系数在1×10-4至1×10-3的范围内。此外，当在超过200℃的温度下处理时，在氧化锆膜中发现一定程度的不均匀性。 ORMOSIL和二氧化钛的加入改善了氧化锆膜的微观结构，并使得厚度可能达到10μm的膜成为可能。使用经典的Lorentz模型从SE光谱中推导了掺有若丹明6G，若丹明640和恶嗪725的氧化锆膜的复折射率。所得到的吸收光谱与通过分光光度计测量的吸收光谱非常吻合。与纯氧化锆薄膜不同，染料掺杂薄膜的折射率光谱显示出异常色散。此外，通过适当的模型分析了分层波导结构的SE光谱。对于多层结构，发现中间层中二氧化钛-二氧化硅的体积分数随引导膜的初始厚度而降低。在玻璃基板上掺杂了若丹明6G，若丹明640和恶嗪725的高度均匀的溶胶-凝胶氧化锆和氧化锆-ORMOSIL膜已用于分布式反馈配置中，以获得从黄色到近红外区域的可调激光发射。在厚度为6.7 m的R6G掺杂的氧化锆-二氧化钛-ORMOSIL波导激光器中，圆偏振交叉光束同时产生了多达八对对应于八个传播模式的TE / TM波。通过使用折射率与玻璃基板的折射率匹配的溶胶-凝胶二氧化钛-二氧化硅的覆盖层，也可以获得具有0.1 mm引导膜的对称波导激光器。此外，研究了R6G和R640在不同溶胶-凝胶基质中的光稳定性。与二氧化钛-二氧化硅，氧化锆-ORMOSIL和氧化锆-二氧化钛-ORMOSIL相比，鉴于稳定的激光发射和高光稳定性，氧化锆似乎是功能性有机掺杂剂的理想基质。

著录项

  • 作者

    Shi, Lei.;

  • 作者单位

    The Chinese University of Hong Kong (People's Republic of China).;

  • 授予单位 The Chinese University of Hong Kong (People's Republic of China).;
  • 学科 Physics Optics.
  • 学位 Ph.D.
  • 年度 2004
  • 页码 171 p.
  • 总页数 171
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 光学;
  • 关键词

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