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Rauscheigenschaften von passiv modengekoppelten Ytterbium-Faserlasern

Rauscheigenschaften von passiv modengekoppelten Ytterbium-Faserlasern


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About the Book

Rauscharme Lasersysteme werden fur zahlreiche Anwendungen wie unter anderem die optische Frequenzmetrologie benotigt. Obwohl Faserlaser im Vergleich zu herkommlich genutzten schlechtere Rauscheigenschaften aufweisen, bieten sie dennoch entscheidende Vorteile wie die Justagefreiheit und geringe Kosten. Allerdings sind die Pulsenergien durch die hohen auftretenden nichtlinearen Effekte limitiert. Durch die Nutzung von „wave-breaking“-freien Pulsen in normal dispersiven Faserlasern ist es allerdings moglich die Pulsenergien gegenuber herkommlichen Faserlasersystemen um bis zu eine Großenordnung zu erhohen. Bezuglich der Rauscheigenschaften existieren fur dieses Pulsregime jedoch bisher keine detaillierten Untersuchungen. In dieser Arbeit wurde ein entsprechendes Lasersystem realisiert, und es konnte durch einen Vergleich eines analytischen Modells zur Berechnung der Quantenrauscheinflusse mit numerischen Simulationen geklart werden, dass das analytische Modell die Quantenrauscheinflusse um bis zu 14 dB unterschatzt. Eine Messung des entsprechenden Phasenrauschens der Repetitionsrate zeigte eine optimale Ubereinstimmung mit den Ergebnissen der numerischen Simulationen, wodurch gezeigt werden konnte, dass die Rauscheinflusse nur durch Quantenfluktuationen dominiert waren. Zur vollstandigen Charakterisierung der Rauscheigenschaften wurden zusatzlich das Phasenrauschen einer optischen Linie und das Rauschen der Schlupffrequenz (CEO-Frequenz) untersucht. Diese beiden Parameter sind uber das Gummiband-Modell eng miteinander verknupft. Es konnte gezeigt werden, dass resultierend aus den dominierenden Quantenrauscheinflussen das optische Phasenrauschen im Vergleich zu dem Rauschen der CEO-Frequenz deutlich niedriger war, und dass der Fixpunkt des Gummibandes innerhalb des optischen Spektrums lag. Entsprechend war die spektrale Rauschleistungsdichte der CEO-Phasenfluktuationen einen Faktor (?opt/fRep)2 ( 140 dB) großer als die der Phasenfluktuationen der Repetitionsrate, wodurch sich eine CEOFrequenz- Linienbreite von ca. 3MHz ergab. Insgesamt konnte erstmals experimentell und theoretisch gezeigt werden, dass Faserlaser aufgrund ihrer limitierten Pulsenergie, der großen Pulsdauer und der hohen resonatorinternen Verluste sehr starken Einflussen von Quantenrauschen unterliegen, woraus sich ein erhohter zeitlicher Jitter und hohe CEOFrequenz- Linienbreiten im MHz-Bereich ergeben konnen. Durch die gewonnenen Erkenntnisse war es moglich, ein neues Konzept fur die Realisierung eines sehr rauscharmen Femtosekunden-Faserlasers zu formulieren.


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Product Details
  • ISBN-13: 9783869552361
  • Publisher: Cuvillier Verlag
  • Binding: Paperback
  • Language: German
  • Width: 197 mm
  • ISBN-10: 3869552360
  • Publisher Date: 2/21/2010
  • Height: 210 mm
  • Weight: 8 gr


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Rauscheigenschaften von passiv modengekoppelten Ytterbium-Faserlasern
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