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首页> 外文学位 >Development of a tunable, narrow linewidth 2.066 micrometer holmium, thulium: yttrium lithium fluoride laser for open-path remote sensing of atmospheric carbon dioxide and water vapor.
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Development of a tunable, narrow linewidth 2.066 micrometer holmium, thulium: yttrium lithium fluoride laser for open-path remote sensing of atmospheric carbon dioxide and water vapor.

机译：研发了一种可调谐，窄线宽2.066微米的,、 :：氟化钇钇锂激光器，用于大气二氧化碳和水蒸气的开放路径遥感。

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摘要

A tunable, narrow-frequency, continuous wave 2.066 {dollar}mu{dollar}m Ho:YLF laser was developed, characterized, and used for the first time in preliminary spectroscopic measurements of CO{dollar}sb2{dollar} and water vapor in the laboratory and atmosphere. The laser was constructed using a 4 mm long, codoped 5% Tm and 0.5% Ho Yttrium Lithium Fluoride (YLF) crystal that was cut at Brewster's angle, cooled to -15{dollar}spcirc{dollar}C using a TE cooler, and pumped by an Ar{dollar}sp+{dollar} pumped Ti:Sapphire laser operating at 792 nm. Intracavity etalons were used to reduce the laser linewidth to about 0.025 cm{dollar}sp{lcub}-1{rcub}{dollar}, consisting of two longitudinal modes. The peak Ho:YLF laser output power with intracavity etalons was about 32 mW at a pump power of 500 mW. The laser wavelength was continuously tunable across the laser cavity longitudinal modes over about a 6 cm{dollar}sp{lcub}-1{rcub}{dollar} range. The output beam profile was nearly Gaussian, but had a slight astigmatism and possibly some higher order transverse modes.; The Ho:YLF laser was used to perform spectroscopic measurements on molecular CO{dollar}sb2{dollar} in a laboratory absorption cell. The transmission spectra of CO{dollar}sb2{dollar} were taken across several absorption lines of CO{dollar}sb2{dollar} and the measured peak transmission and linewidth agreed within {dollar}pm{dollar}8 and {dollar}pm{dollar}5% respectively, with those published previously. The discrepancies were attributed to the asymmetric multimode operation of the laser.; The Ho:YLF laser was also used to measure the concentration of CO{dollar}sb2{dollar} and of water vapor in the atmosphere. Preliminary path averaged concentration measurements of CO{dollar}sb2{dollar} were taken for a 135 m path over a parking lot. The CO{dollar}sb2{dollar} concentration was found to be about 450 to 550 ppm ({dollar}pm{dollar}20%) which is somewhat higher than the accepted world average concentration of CO{dollar}sb2{dollar} of 330 ppm. In addition, the measured water vapor concentration over the same path was found to be about 2000 ppm ({dollar}pm{dollar}20%) which was within about 15% of the actual value.
机译：开发并表征了可调谐的窄频连续波2.066 {μm}μm{m}} Ho：YLF激光器，并对其进行了表征，并将其首次用于初步光谱测量中的CO {sb2sb2 {oll}}和水蒸气。实验室和气氛。激光是使用4毫米长，共掺杂的5％Tm和0.5％氟化Ho钇锂（YLF）晶体构成的，该晶体以Brewster角切割，并使用TE冷却器冷却至-15spspcirc {dollarC}，以及由工作在792 nm的Ar {dollar} sp + {dollar}泵浦的Ti：Sapphire激光器泵浦。腔内标准具用于将激光线宽减小至约0.025 cm {dol}} {lcub} -1 {rcub} {dollar}，包括两个纵向模式。腔内标准具的峰值Ho：YLF激光输出功率在500 mW的泵浦功率下约为32 mW。激光波长在大约6 cm {dol} sp {lcub} -1 {rcub} {dollar}范围内的激光腔纵向模式上连续可调。输出光束轮廓几乎是高斯分布，但有轻微的像散，可能还有一些更高阶的横向模。 Ho：YLF激光器用于在实验室吸收池中对分子CO {sb2} {sb2}进行光谱测量。沿CO {dollar} sb2 {dollar}的多个吸收线截取了CO {dollar} sb2 {dollar}的透射光谱，并且测得的峰值透射率和线宽在{dollar} pm {dollar} 8和{dollar} pm {美元} 5％，与先前发布的那些相比。差异归因于激光器的不对称多模工作。 Ho：YLF激光器还用于测量大气中CO {sb2sb2 {dollar}和水蒸气的浓度。对停车场上方135 m的路径进行了CO {dollar} sb2 {dollar}的平均路径平均浓度测量。发现CO {dollar} sb2 {dollar}的浓度约为450至550 ppm（pm）{{dollar} 20％），这略高于世界公认的CO {dollar} sb2 {dollar}的浓度。 330 ppm。另外，发现在同一路径上测得的水蒸气浓度为约2000ppm（（pmpm {20％），这在实际值的约15％以内。

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  • 作者

    Taczak, Thomas Michael.;

  • 作者单位

    University of South Florida.;

  • 授予单位 University of South Florida.;
  • 学科 Physics Optics.; Physics Atmospheric Science.
  • 学位 Ph.D.
  • 年度 1996
  • 页码 199 p.
  • 总页数 199
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 光学;大气科学（气象学）;
  • 关键词

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