Temat: supercontinuum generation

Skocz do pozycji: 1.

Tytuł:: Influence of dispersion slope on soliton spectral tunneling in photonic crystal fiber
Autorzy:: Yang, Yunxia
Yang, Hua
Tong, Xiongfeng
Zhao, Saili
Chen, Shuyuan
Tematy:: soliton spectral tunneling
supercontinuum generation
dispersion slope; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/2033951.pdf Link otwiera się w nowym oknie
Opis:: We report a numerical investigation of how the dispersion slope affects the soliton spectral tunneling (SST) in a photonic crystal fiber with three zero dispersion wavelengths. It is discovered that a larger dispersion slope makes group-velocity mismatch between the initial soliton and the transferred wave thereby suppressing the SST effect, while a proper decrease of the dispersion slope enhances the SST effect to widen a supercontinuum range. Besides, we find a soliton-like leaking dispersion wave, which can sustain information and energy for a short time within a particular spectral range.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Setting an Upper-Wavelength Limit to the Supercontinuum Generated in a Photonic Crystal Fibre
Autorzy:: Tartara, L.
Degiorgio, V.
Cherif, R.
Zghal, M.
Tematy:: nonlinear optics
photonic crystal fibres
supercontinuum generation; Pokaż więcej
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/308817.pdf Link otwiera się w nowym oknie
Opis:: We report about a novel kind of supercontinuum generation in a photonic crystal fibre in which the spectral broadening occurs only on the blue side of the pump wavelength. As a consequence a limit to the extent of the supercontinuum is set and thus a way for tailoring the broadened spectrum according to a peculiar application is provided. We present a theoretical explanation along with experimental data which are supported by the results of a set of numerical simulations.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Supercontinuum fiber laser source for water quality and heavy metals detection
Autorzy:: Teh, P. C.
Ho, Y. H.
Ong, C. E.
Lee, S. C.
Lo, P. K.
Lai, K. C.
Yeap, K. H.
Loh, S. H.
Teh, P. S.
Tey, K. L.
Tematy:: supercontinuum generation
master oscillator power amplifier
nonlinear optics
transmittance measurement
heavy metal contaminants; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/174135.pdf Link otwiera się w nowym oknie
Opis:: We report a compact, all fiber, 150 ps fiber master oscillator power amplifier operating at 1064 nm that has the ability of producing a maximum average output power of 2.16 W with peak power as high as 10 kW. The output from the master oscillator power amplifier is spliced with a highly nonlinear photonic crystal fiber, generating a supercontinuum with an average power of 250 mW at repetition rate of 1 MHz and spectrum bandwidth spanning from 600 to 1700 nm. The developed supercontinuum system is used to detect the presence of heavy metal contaminants in water by a simple light transmittance method to ensure that the water is free from heavy metal contaminants and safe for consumption. The supercontinuum laser source was shone onto a water sample with a detector placed at another end in order to measure the transmitted supercontinuum light. By measuring the amount of light attenuated at particular wavelength, the concentration of heavy metal contaminants present in the water sample could be determined.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Poszerzenie widma impulsu laserowego poprzez zastosowanie przewężki dwustronnej na standardowym włóknie jednomodowym
Broadening of a pulse laser spectrum obtained by bionical taper on a standard single mode optical fiber
Autorzy:: Stasiewicz, K. A.
Młyńczak, J.
Jaroszewicz, L. R.
Kopczyński, K.
Tematy:: poszerzenie impulsu
efekt supercontinuum
przewężka światłowodowa
laser impulsowy
broadening of a pulse
supercontinuum generation
optical fiber taper
pulse laser; Pokaż więcej
Wydawca:: Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Powiązania:: https://bibliotekanauki.pl/articles/211082.pdf Link otwiera się w nowym oknie
Opis:: Praca przedstawia eksperymentalne wyniki poszerzenia impulsu laserowego dużej mocy w standardowych światłowodach telekomunikacyjnych. Poszerzenie uzyskano poprzez wykorzystanie technologii przewężki dwustronnej, której optymalizacja dla danego typu włókna pozwala na sterowanie tak szerokością impulsu jak i składem widmowym wychodzącej wiązki, prowadząc w konsekwencji do generacji światła białego.
The papers describes the results of a laser pulse broadening in tapered standard single mode fiber. Additional description of a set - up for taper manufacturing, with a principle of its operation, based on elongation procedure of fiber-optics in a low-pressure gas burner, is also presented. A virtue of such a set-up is the possibility of different kinds of taper manufacturing, like punctual, long distance on regular or increasing distance. Tapering process allows us to change a diameter of an optical fiber what means boundary condition changes, beam is propagating in a core (made from silica) surrounded by air. There is a large refractive index step between these two media, allowing for confined pulse (with high power) in a very small area. This effect causes increasing intensity of a propagated beam and amplifies nonlinear effects, like self-phase modulation etc. The article presents the results of pulse broadening obtained in different tapers, made on a single-mode fiber for a wavelength of 1310 nm and a core diameter of about 9 žm. As a light source, the pumped laser operated at a wavelength of 532 nm, which emitted the pulses of 0.6 ns with a repetition rate of about 1 kHz, has been used. All the measured fibers with a taper have a length of about 3 m, where about 1.2 m was for the input (for easier launching) and the output (for easier connection with an optical spectrum analyzer). Experimental results show the pulse broadening in the used taper structures. The best result are obtained for a long distance taper, where the elongated part was about 50 mm (flame brush is travelling to and from along the constant length). For this taper, it can be observed more flat spectrum broadening to the longer wavelength, together with increasing average power of a laser. Theoretically the best broadening we should obtain for a taper length of about 100 mm what will be one of the next subjects of our research. Other tapers also cause broadening effects but their spectra are not so flat. Interesting example is a taper with an increasing length of elongation. We observed additional spectral pick at the wavelength of about 630 nm and 950 nm. These picks are connected with the smaller core diameter obtained in this type of tapering process (the smaller core, the larger broadening). The worst results were for a punctual taper. In this case, a diameter of a taper is very small (about several micrometers) but the losses are very high. The presented results show that biconical tapered single mode optical fiber is a good way to obtain spectral broadening (supercontinuum effect).
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Fully negative near-zero ultra-flat dispersion photonic crystal fibers in E+S+C+L band
Autorzy:: Mao, Yucheng
Ma, Yiwu
Huang, Ying
Yang, Hua
Tematy:: photonic crystal fibre
ultra-flattened dispersion
confinement loss
dispersion management method
supercontinuum
SC
generation; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/2172855.pdf Link otwiera się w nowym oknie
Opis:: We demonstrate a modified hexagonal three-layer air-hole photonic crystal fiber (PCF) which presents a good ability of dispersion management. The proposed PCF not only achieved an ultra-flattened all-negative dispersion characteristics of 0.15085 ps/(km·nm) fluctuation within the wavelength range of E+S+C+L wavelength band but also has been able to obtain other interesting features such as low confinement loss. Furthermore, the quadrilateral and octagonal structures are investigated to compare the superiority of different structures and analyze why we chose the hexagonal one.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Badanie optycznych właściwości materiałów fotonicznych metodą spektroskopii czasowo rozdzielczej
The study of optical properties of photonic materials by the techniques of time resolved spectroscopy.
Autorzy:: Marchenko, Anastasiia
Opis:: Eksperyment pump-probe należy do jednej z technik spektroskopii czasowo-rozdzielczej. W pracy opisano zaprojektowanie i zbudowanie układu eksperymentalnego pompująco-próbkującego, który pozwala na pomiar zmian absorpcji lub transmisji materiału optycznego. Badana próbka zostaje wzbudzona impulsami z lasera femtosekundowego, kolejny impuls opóźniony względem impulsu wzbudzającego jest używany do rejestracji zmian absorpcji wprowadzonych poprzez wzbudzenie. W pracy także opisano techniki ustalenia zerowego opóźnienia wiązek oraz podstawową teorię generacji superkontinuum, w tym wybór materiałów do jego generacji.
The pump-probe experiment belongs to one of the techniques of time-resolved spectroscopy. The design and construction of an experimental pump-probe setup that allows the measurement of changes in the absorption or transmission of optical material were described. The studied sample is excited with pulses from the femtosecond laser, the next pulse delayed with respect to the excitation pulse is used to register the absorption changes introduced by the excitation. Also, techniques for chirp-measurements and basic theory of supercontinuum generation, including the selection of materials for its generation, were described.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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