Bright spatially coherent wavelength-tunable deep-UV laser source using an Ar-filled photonic crystal fiber

Nicolas Y Joly, J Nold, Wonkeun Chang, P Hölzer, Alexander Nazarkin, G K L Wong, Fabio Biancalana, Philip St J Russell

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We report on the spectral broadening of similar to 1 mu J 30 fs pulses propagating in an Ar-filled hollow-core photonic crystal fiber. In contrast with supercontinuum generation in a solid-core photonic crystal fiber, the absence of Raman and unique pressure-controlled dispersion results in efficient emission of dispersive waves in the deep-UV region. The UV light emerges in the single-lobed fundamental mode and is tunable from 200 to 320 nm by varying the pulse energy and gas pressure. The setup is extremely simple, involving <1 m of a gas-filled photonic crystal fiber, and the UV signal is stable and bright, with experimental IR to deep-UV conversion efficiencies as high as 8 %. The source is of immediate interest in applications demanding high spatial coherence, such as laser lithography or confocal microscopy.

Original languageEnglish
Article number203901
Number of pages4
JournalPhysical Review Letters
Issue number20
Publication statusPublished - 20 May 2011

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