White-light supercontinuum generation in normally dispersive optical fiber using original multi-wavelength pumping system

Abstract

We report on the experimental demonstration of a white-light supercontinuum generation in normally dispersive singlemode air-silica microstructured fiber. We demonstrate that the simultaneous excitation of the microstuctured fiber in its normal and anomalous dispersion regimes using the fundamental and second harmonic signals of a passively Q-switched microchip laser leads to a homogeneous supercontinuum in the visible range. This pumping scheme allows the suppression of the cascaded Raman effect predominance in favor of an efficient spectrum broadening induced by parametric phenomena. A flat supercontinuum extended from 400 to 700 nm is achieved.

Multimodal Imaging of Living Cells with Multiplex Coherent Anti-stokes Raman Scattering (CARS), Third-order Sum Frequency Generation (TSFG) and Two-photon Excitation Fluorescence (TPEF) Using a Nanosecond White-light Laser Source

“…Dual-wavelength pumping enables us to obtain homogeneous spectral broadening, smooth spectral profile, and single mode operation in the visible range. 16,17 By using the SC light source with dual-pumping scheme, we have reported the first demonstration of Raman optical activity (ROA) by coherent anti-Stokes Raman scattering (CARS) in the visible range. 18 The SC has been widely used in microscopic imaging.…”

Four-wave mixing UV generation in optical microfibers

“…Ultraviolet (UV) generation has traditionally relied on crystals and gases to allow frequency conversion from longer wavelengths [1][2][3][4][5][6][7][8][9][10]. These methods involve the use of nonlinear crystals such as KTP, KDP, sapphire, K2Al2B2O7, potassium pentaborate (KB5), the exploitation of nonlinear processes in waveguides such as photonic crystal fibers or the use of hybrid schemes employing both waveguides and nonlinear crystals [1][2][3][4][5][6][7].…”

“…These methods involve the use of nonlinear crystals such as KTP, KDP, sapphire, K2Al2B2O7, potassium pentaborate (KB5), the exploitation of nonlinear processes in waveguides such as photonic crystal fibers or the use of hybrid schemes employing both waveguides and nonlinear crystals [1][2][3][4][5][6][7]. Fiberized UV generation in optical fibers typically involve the use of gas-filled hollow core microstructured fibers, or otherwise exploit nonlinear processes such as supercontinuum generation to generate a broad spectrum which extends down to the UV wavelength region [8][9][10][11][12][13][14][15].…”

Overcoming temporal polarization instabilities from the latent birefringence in all-normal dispersion, wave-breaking-extended nonlinear fiber supercontinuum generation

“…Fibers exhibiting normal dispersion relax the constraints on the launched pulse duration, and permit stable SC generation with a much broader range of input pulse parameters. Photonic crystal fibers (PCF) with all normal dispersion have been used to create few-cycle pulses [2], octave-spanning SC [3], white-light SC [3,4], and high compression ratio pulses [2,[5][6][7]. Solid, ultrahigh-numerical-apertures (UHNA) fibers with all normal dispersion profiles are less frequently used, e.g.…”