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Frequency Combs for Spectroscopy in the Vacuum Ultraviolet.

機(jī)譯：真空紫外光譜中的頻率梳。

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摘要

This dissertation explores frequency comb spectroscopy and, in particular, its extension to the vacuum-ultraviolet (VUV) and extreme-ultraviolet (XUV) wavelength regimes through a technique called intracavity high harmonic generation (IHHG). By combining the techniques of passive pulse amplification in an enhancement cavity with high harmonic generation, IHHG enables the direct conversion of near-infrared radiation to the VUV/XUV while still maintaining the underlying comb structure.;As part of this work, a series of numerical simulations was performed to investigate the plasma that is formed in the IHHG process and its implications for the resulting VUV comb. It was demonstrated that a fundamental limitation to the performance of IHHG experiments is due to the single-pass ionization phase shift acquired by the pulse circulating in the enhancement cavity. Furthermore, we showed that a static background plasma accumulates between pulses and complicates cavity stabilization.;Insights gained from the simulations led to the development of a novel pump-probe technique using the enhancement cavity that allowed a direct measurement of the intracavity plasma and its decay dynamics in real-time. Because the plasma lifetime plays such a crucial role in the operation of these cavities, it was important to have a method to test ways of reducing it.;To build on our initial IHHG results showing record-level powers in the XUV, we implemented a fully phase-coherent dual comb spectrometer consisting of two identical IHHG systems operating in parallel. The system is designed for precision spectroscopy in the VUV and is based on a pair of homemade ytterbium fiber lasers that use a parabolic amplification scheme to achieve 80 fs pulses after amplification to 50 W of average power. Initial dual comb data showing system performance at the fundamental frequency and third harmonic are presented.
機(jī)譯：本文探討了頻率梳光譜技術(shù)，特別是通過(guò)腔內(nèi)高諧波產(chǎn)生（IHHG）技術(shù)將其擴(kuò)展到真空紫外（VUV）和極紫外（XUV）波長(zhǎng)范圍。通過(guò)將增強(qiáng)型腔中的無(wú)源脈沖放大技術(shù)與高次諧波產(chǎn)生相結(jié)合，IHHG能夠?qū)⒔t外輻射直接轉(zhuǎn)換為VUV / XUV，同時(shí)仍保持底層梳狀結(jié)構(gòu)。進(jìn)行了數(shù)值模擬，以研究在IHHG工藝中形成的等離子體及其對(duì)所得VUV梳的影響。事實(shí)證明，對(duì)IHHG實(shí)驗(yàn)性能的基本限制是由于增強(qiáng)腔中循環(huán)的脈沖獲得的單程電離相移。此外，我們還顯示出靜態(tài)背景等離子體在脈沖之間累積，并使腔穩(wěn)定性變得復(fù)雜。從仿真中獲得的見解導(dǎo)致了使用增強(qiáng)腔的新型泵浦探針技術(shù)的發(fā)展，該技術(shù)允許直接測(cè)量腔內(nèi)等離子體及其衰減實(shí)時(shí)動(dòng)態(tài)。由于等離子壽命在這些腔體的運(yùn)行中起著至關(guān)重要的作用，因此重要的是要有一種方法來(lái)測(cè)試減小腔體的方法。要基于我們最初的IHHG結(jié)果顯示XUV的功率水平，我們實(shí)施了全相干雙梳光譜儀，由兩個(gè)并行運(yùn)行的相同IHHG系統(tǒng)組成。該系統(tǒng)設(shè)計(jì)用于VUV中的精密光譜學(xué)，基于一對(duì)自制的fiber光纖激光器，這些激光器使用拋物線放大方案，在放大到50 W平均功率后可實(shí)現(xiàn)80 fs脈沖。給出了初始雙梳數(shù)據(jù)，該數(shù)據(jù)顯示了在基頻和三次諧波下的系統(tǒng)性能。

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  • 作者

    Carlson, David R.;

  • 作者單位

    The University of Arizona.;

  • 授予單位 The University of Arizona.;
  • 學(xué)科 Optics.;Physics.
  • 學(xué)位 Ph.D.
  • 年度 2016
  • 頁(yè)碼 101 p.
  • 總頁(yè)數(shù) 101
  • 原文格式 PDF
  • 正文語(yǔ)種 eng
  • 中圖分類
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