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Ultrafast Mid-Infrared Laser-Solid Interactions
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| 자료유형 | 학위논문 |
|---|---|
| 서명/저자사항 | Ultrafast Mid-Infrared Laser-Solid Interactions. |
| 개인저자 | Werner, Kevin Thomas. |
| 단체저자명 | The Ohio State University. Physics. |
| 발행사항 | [S.l.]: The Ohio State University., 2019. |
| 발행사항 | Ann Arbor: ProQuest Dissertations & Theses, 2019. |
| 형태사항 | 220 p. |
| 기본자료 저록 | Dissertations Abstracts International 81-02B. Dissertation Abstract International |
| ISBN | 9781085653336 |
| 학위논문주기 | Thesis (Ph.D.)--The Ohio State University, 2019. |
| 일반주기 |
Source: Dissertations Abstracts International, Volume: 81-02, Section: B.
Advisor: Chowdhury, Enam. |
| 이용제한사항 | This item must not be sold to any third party vendors. |
| 요약 | This dissertation presents a study of the fundamental mechanisms of ultrafast mid-infrared laser-solid interactions, focusing on semiconductors. Laser intensities both above and below the laser-induced damage threshold are used in this study. Despite a recent increase in interest in both applications and fundamental mechanisms, the mid-infrared wavelength regime has hardly been studied previously with ultrashort pulses.New ultrafast mid-infrared laser sources allow for increased access to this regime of laser-solid interaction. An ultrafast, mid-infrared optical parametric amplifier was designed, fabricated, and characterized. The construction of this optical parametric amplifier has led to many experiments and collaborations, which are presented in this dissertation.Measurements of single and multi-pulse laser induced damage thresholds were studied in silicon as a function of mid-infrared wavelength. Additionally, unique morphology was studied with a wide array of imaging techniques. The results of these studies were compared to existing theoretical models and experiments with near-infrared, visible, and ultraviolet wavelengths. We find that further modification to existing models and/or new models are needed to explain the data. Our computational efforts, while they don't show good matching to the experimental data, will contribute to future studies in this area.Experimental studies and numerical simulations were also performed with intensity below the laser induced damage threshold. Polycrystalline zinc selenide is an exciting source of broadband supercontinuum and high-harmonic generation via random quasi phase matching, exhibiting broad transparency in the mid-infrared (0.5-20 關m). The effects of wavelength, pulse power, intensity, propagation length, and crystallinity on supercontinuum and high harmonic generation are investigated experimentally using ultrafast mid-infrared pulses. Observed harmonic conversion efficiency scales linearly in propagation length reaching as high as 36%. For the first time to our knowledge, n2 is measured for mid-infrared wavelengths in ZnSe: n2(貫=3.9 關m)=(1.2짹0.3x10-14 cm2/W). Our n2 measurement is applied to simulations modeling high-harmonic generation in polycrystalline ZnSe as an effective medium using unidirectional pulse propagation simulations. Good matching to the experimental results is found, and the model suggests the harmonics are generated by cascaded harmonic generation. |
| 일반주제명 | Physics. |
| 언어 | 영어 |
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