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Microstructure‐fiber sources of mode‐separable supercontinuum emission for wave‐mixing spectroscopy
Author(s) -
Fedotov A. B.,
Zhou Ping,
Tarasevitch A. P.,
Dukel'skii K. V.,
Kondrat'ev Yu. N.,
Shevandin V. S.,
Smirnov V. B.,
von der Linde D.,
Zheltikov A. M.
Publication year - 2002
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.935
Subject(s) - supercontinuum , materials science , optics , microstructure , doppler broadening , laser , wavelength , fiber , optoelectronics , zero dispersion wavelength , optical fiber , photonic crystal fiber , dispersion shifted fiber , spectral line , physics , fiber optic sensor , composite material , astronomy
Microstructure fibers are shown to provide a high efficiency of generation of mode‐separable and frequency‐convertible supercontinuum of a high spectral and spatial quality, offering much promise as sources of broadband radiation for wave‐mixing spectroscopy and time‐resolved pump–probe measurements, and also for seeding optical parametric amplifiers. The long‐wavelength and visible parts of supercontinuum emission generated by 40 fs pulses of 800 nm Ti : sapphire laser radiation in fused‐silica microstructure fibers are shown to be spatially separated in microstructure‐fiber modes. With an appropriate spectral filtering, bell‐shaped modes of the long‐wavelength section (∼720–900 nm) of the supercontinuum generated in a microstructure fiber with a small core diameter can be separated from either doughnut‐like or bipartite modes of the visible part (∼400–600 nm) of this supercontinuum. This effect can be employed for the spectral slicing of single modes of supercontinuum emission from microstructure fibers. Frequency convertibility of spectrally sliced supercontinuum is demonstrated by experiments on sum‐frequency generation in a non‐linear crystal. Copyright © 2002 John Wiley & Sons, Ltd.