Broadband source of picosecond radiation

Coherent light generators – Raman laser

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372 6, 372 23, 372 92, 372 51, 307426, H01S 330

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active

H00000159

ABSTRACT:
The present invention relates to a means for generating a broadband source of picosecond radiation in the visible and near-infrared spectral regions. In operation, picosecond pulses with wavelength .lambda. are supplied by a laser pump source (10) and injected into the liquid core of a single mode optical fiber (18). A broadband continuum is generated in the liquid core by two mechanisms. Stimulated Raman scattering in the liquid core of the optical fiber shifts the wavelength of the incoming radiation by an amount equal to the energy of the vibrations in the liquid molecules, where with sufficient power, multiple shifts are possible. In addition, the pump radiation and the shifted radiation are broadened by self-phase modulation thereby "filling" the region between the discrete shifted lines. The output radiation from the optical fiber is, therefore, a broadband tunable picosecond pulse source.

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