Niniejsza praca dotyczy zagadnień związanych z wytwarzaniem światło-wodowych struktur periodycznych przy wykorzystaniu lasera ekscymerowego oraz masek dyfrakcyjnych.
W pracy wykazano w jaki sposób wybrane parametry układu laserowego wpływają na parametry optyczne wytworzonych struktur. Wymagało to przeprowadzenia obliczeń numerycznych określających wpływ kluczowych parametrów fizycznych struktur na ich właściwości optyczne. Pozwoliło to na wyznaczenie wartości kluczowych parametrów fizycznych struktur takich jak długość okresu, długość struktury, zmiana współczynnika załamania wewnątrz struktury, pozwalających na uzyskanie pożądanych charakterystyk widmowych. Parametry te zostały uwzględnione w procesie projektowanie i wykonania kompletnej linii technologicznej umożliwiającej zapis siatek Bragga na włóknach światłowodowych.
Do oceny parametrów wytwarzanych struktur optycznych wprowadzono (zdefiniowano) odpowiednie wskaźniki jakościowe. Następnie wykazano możliwość wpływania na te parametry poprzez regulację parametrów układu laserowego. W tym celu zaprojektowano układ przeniesienia wiązki promieniowania UV z lasera na włókno światłowodowe umożliwiający i kontrolowanie sterowanie geometrią wiązki optycznej. Układ przeniesienia na włókno światłowodowe dostosowano do rzeczywistego rozkładu natężenia wyjściowej wiązki laserowej. Aby zapewnić optymalność warunków zapisu struktur wykonano również projekt układu dystansowania oraz obserwacji położenia włókien światłowodowych względem maski fazowej. Wymiernym efektem badań uzyskanych przy wykorzystaniu zaproponowanego układu optycznego była wykonana na potrzeby pracy analiza wpływu parametrów ułożenia geometrycznego włókna na parametry optyczne periodycznych struktur optycznych. Istotnym elementem było również określenie wpływu zamian parametrów lasera ekscymerowego (częstotliwość generowanych impulsów, energia impulsów, repetycja, czas ekspozycji włókna) na parametry optyczne wytwarzanych siatek Bragga.
Za osiągnięcia własne pracy uważam:
zdefiniowanie wskaźników jakościowych światłowodowych siatek Bragga na podstawie wykresów ich widm,
wykonanie obliczeń numerycznych pozwalających na określenie wpływu parametrów fizycznych struktur na ich właściwości optyczne (modelowanie przy wykorzystaniu techniki macierzy przejścia),
123
wykonanie projektu układu przeniesienia wiązki UV z lasera na włókno światłowodowe i umożliwiającego sterowanie wiązką w środowisku CAD,
zaproponowanie oraz realizację metody pomiaru rozkładu natężenia wiązki UV po przejściu przez układ przeniesienia
określenie warunków nieniszczących dla elementów optycznych w zaprojektowanym układzie,
zaprojektowanie układu dystansowania włókna światłowodowego
względem maski fazowej,
określenie możliwości uzyskania powtarzalności parametrów
wytwarzanych struktur,
określenie wpływu parametrów geometrycznych układu przeniesienia wiązki laserowej na wskaźniki jakościowe charakteryzujące struktury na podstawie ich widm,
wyznaczenie wpływu parametrów pracy lasera ekscymerowego na zdefiniowane wskaźniki jakościowe.
124
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Streszczenie
Niniejsza praca dotyczy zagadnień związanych z technologią wytwarzania światłowodowych siatek Bragga. W szczególności podjęto w niej zadanie zaprojektowania oraz realizacji kompletnego układu do zapisu struktur periodycznych wytwarzanych we włóknach światłowodowych. Do realizacji układu wykorzystano metodę maski fazowej, w której głównym elementem jest laser ekscymerowy o długości fali 248nm.
W pierwszej części pracy zawarto teoretyczne podstawy światłowodowych siatek Bragga w tym podział struktur periodycznych oraz ich charakterystykę. Następnie przedstawiono zjawisko fotoczułości włókien światłowodowych ze szkła kwarcowego domieszkowanych tlenkiem germanu. Kolejno podjęty został