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1.3: Applications

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    • High time resolution: Ultrafast Spectroscopy, tracing of ultrafast physical processes in condensed matter (see Figure 1.3), chemical reactions, physical and biological processes, influence chemical reactions with femtosecond pulses: Femto-Chemistry (Noble Prize, 2000 to A. Zewail), high speed electric circuit testing and sampling of electrical signals, see Figure 1.4.
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    Figure 1.3: Pump-probe setup to extract time constants relevant for the carrier dynamics in semiconductors.
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    Figure 1.4: High speed A/D conversion with a high repetition rate picoor femtosecond laser.
    • High spatial resolution: \(c\tau_{\text{FWHM}}\); optical imaging, e.g. optical coherence tomography, see Figs. 1.5-1.8).
    截屏2021-03-25 上午9.08.20.png
    Figure 1.5: Setup for optical coherence tomography. Courtesy of James Fujimoto. Used with permission.

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    Figure 1.6: Cross section through the human eye. Courtesy of James Fujimoto. Used with permission.

    截屏2021-03-25 上午9.08.55.png
    Figure 1.7: Comparison of retinal images taken with a superluminescence diode (top) versus a broadband Ti:sapphire laser (below). Courtesy of James Fujimoto. Used with permission.
    • Imagaing through strongly scattering media:
    截屏2021-03-25 上午9.09.39.png
    Figure 1.8: Imaging of the directly transmitted photons results in an un-blurred picture. Substitution for x-ray imaging; however, transmission is very low.
    • High bandwidth: massive WDM optical communications, many channels from one source or massive TDM, high bit-rate stream of short pulses.
    • High intensities: Large intensities at low average power \(\Rightarrow\) Nonlinear frequency conversion, laser material processing, surgery, high intensity physics: x-ray generation, particle acceleration, ...

    This page titled 1.3: Applications was last modified on Wed, 14 Sep 2022 19:34:37 GMT and is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by Franz X. Kaertner (MIT OpenCourseWare) via source content that was edited to the style and standards of the LibreTexts platform.