1,721,035 research outputs found
Frequency Shifting of Femtosecond Pulses by Reflection at Solitons
No full textThe frequency shifting of an ultrashort optical pulse through reflection at a fundamental soliton is experimentally investigated in a microstructured optical fiber. The frequency up- and down-conversion is observed with efficiencies up to 70%. Through employing femtosecond pulses, relevant features of the interaction are highlighted, and the role of either the leading or the trailing edge of the soliton is proven
A Fermat's spiral multifilament-core fiber
No full textA multifilament-core optical fiber where the microstructure is arranged in a Fermat’s spiral is presented. The properties of such a fiber to be exploited for laser light amplification are numerically investigated by means of a full-vectorial finite-element method. Thanks to this peculiar microstructure, the fiber is shown to have an increased Brillouin threshold power and very low bending losses, while preserving a very good beam spatial quality
Picosecond synchronously pumped optical parametric oscillator delivering transform-limited pulses in the degeneracy region
No full textWe report about a PPKTP optical parametric oscillator synchronously pumped by a picosecond Ti:Sapphire laser. The system is tunable in the spectral region around 1.55 lm which corresponds to the degeneracy wavelength. Nevertheless, it is able to deliver transform-limited pulses thanks to the insertion of a properly designed birefringent filter which ensures single-frequency operation as well. The resonating wavelength can be tuned for more than 100 nm by a simple rotation of the filter and is proven to be insensitive to cavity length detuning and pump wavelength drift
Efficient infrared to blue conversion in the propagation of ultrashort pulses in a microstructured fiber
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Efficient infrared-to-blue conversion in the propagation of ultrashort pulses in a microstructured fiber
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