Microstructure‐fiber sources of mode‐separable supercontinuum emission for wave‐mixing spectroscopy

Abstract

Microstructure fibers are shown to provide a high efficiency of generation of mode-separable and frequencyconvertible 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.

Solitonic spectral transformations in double core photonic crystal fiber

“…This interaction can smear out the two spectral peaks occurred at low energies and resulting in one broad feature at higher excitation energies. Similarly, possibility of spectral content control by varying the excitation conditions of multicore fibers was shown in the case of two 23 and seven 24 coupled fiber cores at femtosecond excitation. In comparison the energy dependence of the visible spectra at double core excitation (Fig.8b) to the single core excitation spectra (Fig.5) the simplier character is observable in correspondence to the IR behaviour.…”

Identification of the role of higher-order effects in supercontinuum generation in the microstructured fiber

“…The broadband SC generation in the microstructured fiber currently attracts a lot of attention because of its being increasingly used in metrology, optical coherence tomography and optical communication [8][9][10]. SC generation is usually the synergy of some fundamental sophisticated nonlinear processes.…”

Fast wavelength multiplexing of a white-light supercontinuum using a digital micromirror device for improved three-dimensional fluorescence microscopy

“…The PCF-based WLS source has found applications in frequency metrology, 14 spectroscopy, 15,16 and various types of microscopy and imaging. [17][18][19] For many of these techniques, the ability to select discrete wavelengths from the WLS is key to the success of the source.…”