[laser] init

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Simon Bruder 2019-03-11 18:37:57 +00:00
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# LaTeX build files
/latex/**/*.aux
/latex/**/*.eps
/latex/**/*.fdb_latexmk
/latex/**/*.fls
/latex/**/*.log
/latex/**/*.nav
/latex/**/*.out
/latex/**/*.snm
/latex/**/*.toc
*.aux
*.eps
*.fdb_latexmk
*.fls
*.log
*.nav
*.out
*.snm
*.toc
# generated pdfs (reveal pdf export and LaTeX)
*.pdf

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- ./:/srv/www/:ro
labels:
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- "traefik.port=80"

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<tr><td></td><td><a href="revealjs/machtergreifung/">„Machtergreifung“: Von der Präsidialdiktatur zum Führerstaat</a></td></tr>
<tr><td></td><td><a href="revealjs/machtergreifung/handout.pdf">„Machtergreifung“: Von der Präsidialdiktatur zum Führerstaat (handout)</a></td></tr>
<tr><td></td><td><a href="revealjs/information-technology/">information technology</a></td></tr>
<tr><td></td><td><a href="revealjs/laser/">Laser in optischen Laufwerken</a></td></tr>
</table>
</body>
</html>

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background-image="img/laser-matches-styropyro.jpg"
# Einführung
---
<table>
<tr>
<th>L</th>
<td class="fragment" data-fragment-index="1">Light</td>
</tr>
<tr>
<th>A</th>
<td class="fragment" data-fragment-index="1">Amplification by</td>
</tr>
<tr>
<th>S</th>
<td class="fragment" data-fragment-index="1">Stimulated</td>
</tr>
<tr>
<th>E</th>
<td class="fragment" data-fragment-index="1">Emission of</td>
</tr>
<tr>
<th>R</th>
<td class="fragment" data-fragment-index="1">Radiation</td>
</tr>
</table>
<p class="fragment">Lichtverstärkung durch angeregte Abgabe von Strahlung</p>
<notes>
* Angeregte Strahlungsabgabe ist ein Konzept von Einstein
* angeregt heißt, dass Atome, die Strahlung abgeben, nicht im Grundzustand sind
</notes>
---
<div class="table">
<div class="table-row">
<h2 class="table-split">Mikroskopischer Aufbau</h2>
<div class="table-split">
<img src="img/laser-schema.svg">
</div>
</div>
</div>
<notes>
* Unsere Anwendung: Laserdiode
* sehr komplex, daher stark vereinfacht
* Halbleitermaterial: Galliumarsenid, Indiumphosphid
* zwischen Halbleitern: Aktive Region
* Rekombination: Strahlung (Photonen) werden frei
</notes>

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# Anwendungen
---
background-image="img/lasercutter.jpg"
## Lasercutter
---
## Laserschwert

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# Aufbau einer CD
---
<div class="table">
<div class="table-row">
<h2 class="table-split">Schichten</h2>
<div class="table-split">
<img src="img/layers.svg">
</div>
</div>
</div>
---
## Farben
---
background-image="img/pits-lands.jpg"
## »Pits« und »Lands«
---
## Typen
---
## Spuren

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# Demonstration

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# Speicherung
<notes>
* Audio-Daten (Schallwellen)
* digital codiert
* auch beschädigt abspielbar
</notes>
---
## Codierung von Ton
<div class="overlay-container">
<div class="fragment"><img height="350px" src="img/nyquist-shannon-1.svg"></div>
<div class="fragment"><img height="350px" src="img/nyquist-shannon-2.svg"></div>
<div class="fragment"><img height="350px" src="img/nyquist-shannon-3.svg"></div>
</div>
<notes>
* Schallwellen (grün)
* Annäherung an Schallwellen (bis zu ~ 20 Tausend pro Sekunde hörbar)
* Samples (rot)
* repräsentiert: Zeitpunkt und Amplitude (wie stark oben/unten; Lautstärke)
* ungefähres Signal kann rekonstruiert werden
</notes>
---
## Fehlerkorrektur
<script>
document.addEventListener('DOMContentLoaded', () => {
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<div class="fragment" data-id="fehlerkorrektur" data-cycle="0"></div>
<div class="fragment" data-id="fehlerkorrektur" data-cycle="1"></div>
<notes>
* auch sehr komplexes Thema, wieder stark vereinfacht
* Datenstrom wird unterteilt
* an jedes Paket: Prüfsumme
* kann Fehler im Paket korrigieren
* zusätzlich: verteilt
* kann trotz mehrere mm langen Kratzern abspielen
</notes>

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style="font-size: 24px;"
# Ende
<table>
* Wikipedia (en): [Laser diode](https://en.wikipedia.org/wiki/Laser_diode)
* Youtube: [Technology Connections](https://www.youtube.com/channel/UCy0tKL1T7wFoYcxCe0xjN6Q) ([sAbhPeTp51s](https://www.youtube.com/watch?v=sAbhPeTp51s)), [styropyro](https://www.youtube.com/channel/UCJYJgj7rzsn0vdR7fkgjuIA) ([7WoNWslRx1g](https://www.youtube.com/watch?v=7WoNWslRx1g))
* Svarichevsky Mikail (3.13.by): [CD & DVD under microscope](https://3.14.by/en/read/cd-dvd-microscope)
******
* Wikimedia Commons: [Pbroks13](https://commons.wikimedia.org/wiki/User:Pbroks13): [CD layers.svg](https://commons.wikimedia.org/wiki/File:CD_layers.svg)

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\documentclass[
parskip=full,
DIV=16,
paper=a4
]{scrartcl}
\usepackage[ngerman]{babel}
\usepackage{fontspec}
\setromanfont{Georgia}
\setsansfont{Fira Sans}
\renewcommand*{\familydefault}{\sfdefault}
\usepackage{enumitem}
\setlist{noitemsep, topsep=0pt, parsep=0pt, partopsep=0pt} % more compact
\usepackage[compact]{titlesec}
\pagenumbering{gobble}
\title{\vspace{-2em}Laser in optischen Laufwerken}
\author{Jacob Assel, Simon Bruder, Eric Doberstein}
\date{13.03.2019\vspace{-1em}}
\begin{document}
\maketitle
\section*{Einführung}
Laser ist eine Abkürzung für \textbf{L}ight \textbf{A}mplification by
\textbf{S}timulated \textbf{E}mission of \textbf{R}adiation (Lichtverstärkung
durch angeregte Abgabe von Strahlung). Angeregt bedeutet in diesem Fall, dass
das Atom, das die Strahlung abgibt sich nicht im Grundzustand befindet.
\subsection*{Laserdiode}
Im einfachsten Fall ist eine Laserdiode so aufgebaut, dass zwischen zwei
Halbleitern (p- und n-dotiert) aus z.\,B. Galliumarsenid oder Indiumphoshpid
sich die aktive Region befindet, in der die Elektronen und Löcher
rekombinieren. Bei der Rekombination wird Strahlung in der Form von Photonen
frei, die als Laserstrahl sichtbar wird.
\section*{Anwendungen}
\section*{Aufbau einer CD}
\section*{Speicherung}
Auf einer Audio-CD müssen Schallwellen so digital codiert werden, dass man sie
auch von einem beschädigten Medium wieder in Schallwellen umgewandelt werden
können.
\subsection*{Codierung von Ton: Das Nyquist-Shannon-Abtasttheorem}
Schallwellen werden mit einer bestimmten Frequenz (44100 Hz) abgetastet und
für jeden Punkt, an denen die Abtastfrequenz die Schallwelle schneidet wird
ein Datenpunkt gespeichert. Jeder Datenpunkt enthält zwei Werte: Den Zeitpunkt
der Abtastung und die Amplitude (Ausschlag → Lautstärke). Aus diesen
Datenpunkten kann später eine ungefähre Schallwelle rekonstruiert werden.
Dabei ist zu beachten, dass die höchste darstellbare Frequenz die Hälfte der
Abtastrate beträgt (im Fall der CD also 22,05 KHz).
\subsection*{Fehlerkorrektur}
Der wie oben beschriebene Datenstrom wird in kleinere Pakete aufgeteilt. Jedes
der Pakete wird mit einer Prüfsumme versehen, die es ermöglicht, Fehler in
diesem Paket zu erkennen und zu korrigieren. Zusätzlich dazu werden die Pakete
möglichst großflächig zu verteilen, um die Fehler zu verteilen und
dadurch Interpolation zu erleichtern.
\end{document}

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title: "Laser in optischen Laufwerken"
theme: "theme.css"
---
<!--background-image="img/cover.jpg"-->
# Laser in optischen Laufwerken

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@import "../_assets/reveal.js/css/theme/black.css";
@import "../_assets/fonts/Fira Sans/index.css";
@import "../_assets/styles/quote.css";
.reveal h1,
.reveal h2,
.reveal h3,
.reveal h4,
.reveal h5,
.reveal h6,
.reveal {
font-family: "Fira Sans", sans-serif;
}
.reveal section img {
margin: 0;
background: none;
border: none;
box-shadow: none;
}
/* split screen */
.table {
display: table;
}
.table-row {
display: table-row;
}
.table-split {
display: table-cell;
width: 50%;
vertical-align: middle !important;
}
.reveal table th,
.reveal table td {
border-bottom: none;
}
/* image overlay */
.overlay-container {
position: relative;
}
.overlay-container div {
position: absolute;
left: 0;
right:0;
}