Topic
Supercontinuum
About: Supercontinuum is a research topic. Over the lifetime, 7071 publications have been published within this topic receiving 127671 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: Broadband supercontinuum pulses in the few cycle regime are generated by two-stage filamentation in argon and air starting from 100 fs input pulses, which are sufficiently high-power and stable to record time-resolved 2D PE spectra in a single laser shot.
Abstract: Broadband supercontinuum (SC) pulses in the few cycle regime are a promising source for spectroscopic and imaging applications. However, SC sources are plagued by poor stability, greatly limiting their utility in phase-resolved nonlinear experiments such as 2D photon echo spectroscopy (2D PES). Here, we generated SC by two-stage filamentation in argon and air starting from 100 fs input pulses, which are sufficiently high-power and stable to record time-resolved 2D PE spectra in a single laser shot. We obtain a total power of 400 μJ/pulse in the visible spectral range of 500–850 nm and, after compression, yield pulses with duration of 6 fs according to transient-grating frequency-resolved optical gating (TG-FROG) measurements. We demonstrate the method on the laser dye, Cresyl Violet, and observe coherent oscillations indicative of nuclear wavepacket dynamics.
37 citations
TL;DR: It is shown that quasi-phase-matching via periodic modulations of the waveguide structure provides a useful mechanism to control the evolution of ultrafast pulses during supercontinuum generation.
Abstract: Supercontinuum generation (SCG) in integrated photonic waveguides is a versatile source of broadband light, and the generated spectrum is largely determined by the phase-matching conditions. Here we show that quasi-phase-matching via periodic modulations of the waveguide structure provides a useful mechanism to control the evolution of ultrafast pulses during supercontinuum generation. We experimentally demonstrate a quasi-phase-matched supercontinuum to the ${\mathrm{TE}}_{20}$ and ${\mathrm{TE}}_{00}$ waveguide modes, which enhances the intensity of the SCG in specific spectral regions by as much as 20 dB. We utilize higher-order quasi-phase-matching (up to the 16th order) to enhance the intensity in numerous locations across the spectrum. Quasi-phase-matching adds a unique dimension to the design space for SCG waveguides, allowing the spectrum to be engineered for specific applications.
37 citations
TL;DR: In this paper, a new type of seven-core photonic crystal fiber and demonstrated its all-fiber supercontinuum source pumped with a ytterbium-doped fiber master oscillator power amplifier.
Abstract: We have fabricated a new type of seven-core photonic crystal fiber and demonstrated its all-fiber supercontinuum source pumped with a ytterbium-doped fiber master oscillator power amplifier. The generated supercontinuum covers the wavelength range from 720?nm to beyond 1700?nm, with an output power of 42.3?W. It is the first high-power all-fiber SC source based on seven-core photonic crystal fiber.
37 citations
TL;DR: In this article, the topological charge of supercontinuum optical vortices is determined by inspecting the diffraction pattern through a triangular aperture, and it is shown that the vortex charge is constant, and can be consistently measured, across a wide range of colors.
Abstract: A simple technique for determining the topological charge of supercontinuum optical vortices is presented. The spatial dispersion inherent to generating broadband vortices with a single forked grating is compensated with a double-pass arrangement from a single spatial light modulator. The vortex charge is determined by inspecting the diffraction pattern through a triangular aperture. It is shown that the topological charge is constant, and can be consistently measured, across a wide range of colors.
37 citations
TL;DR: The angular distribution of the supercontinuum emission from multiple infrared laser filaments propagating in air over long distances is characterized, and the total light conversion efficiency from the original laser wavelength into the white-light continuum is estimated.
Abstract: We characterized the angular distribution of the supercontinuum emission from multiple infrared laser filaments propagating in air over long distances, from the infrared (1080 nm) to ultraviolet (225 nm). These experimental data suggest that the X-Waves modeling or Cerenkov emission, rather than phase matching of four-wave mixing, could explain the conical emission. We also estimate the total light conversion efficiency from the original laser wavelength into the white-light continuum.
37 citations