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Supercontinuum Generation in Condensed Matter

  • Q. Z. Wang
  • P. P. Ho
  • R. R. Alfano

Abstract

Supercontinuum generation, the production of intense ultrafast broadband “white light” pulses, arises from the propagation of intense picosecond or shorter laser pulses through condensed or gaseous media. Various processes are responsible for continuum generation. These are called self-, induced-, and cross-phase modulations and four-photon parametric generation. Whenever an intense laser pulse propagates through a medium, it changes the refractive index, which in turn changes the phase, amplitude, and frequency of the incident laser pulse. A phase change can cause a frequency sweep within the pulse envelope. This process has been called self-phase modulation (SPM) (Alfano and Shapiro, 1970a). Nondegenerate four-photon parametric generation (FPPG) usually occurs simultaneously with the SPM process (Alfano and Shapiro, 1970a). Photons at the laser frequency parametrically generate photons to be emitted at Stokes and anti-Stokes frequencies in an angular pattern due to the required phase-matching condition. When a coherent vibrational mode is excited by a laser, stimulated Raman scattering (SRS) occurs. SRS is an important process that competes and couples with SPM. The interference between SRS and SPM causes a change in the emission spectrum resulting in stimulated Raman scattering cross-phase modulation (SRS-XPM) (Gersten et al., 1980). A process similar to SRS-XPM occurs when an intense laser pulse propagates through a medium possessing a large second-order x 2 and third-order x 3 susceptibility.

Keywords

Stimulate Raman Scattering Group Velocity Dispersion Nonlinear Refractive Index Liquid Argon Supercontinuum Generation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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© Springer Science+Business Media New York 1989

Authors and Affiliations

  • Q. Z. Wang
  • P. P. Ho
  • R. R. Alfano

There are no affiliations available

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