Blue extended super continuum light source

Details Blue extended super continuum light source Blue extended super continuum light source

2010-07-30

2011-11-15

Sanghavi, Hemang (Department: 2874)

Optical: systems and elements

Optical frequency converter

C385S122000, C372S006000, C372S023000

Reexamination Certificate

active

08059333

ABSTRACT:
In a blue extended super continuum light source, when pulses of partly coherent monochromatic “pump” radiation of essentially constant amplitude are propagating through a microstructure fiber medium within a region of anomalous dispersion of the medium, then, provided the medium has a finite nonlinear coefficient of the index of refraction, the pump pulse is subject to a modulation instability. This results in formation of a train of narrow pulses with Tera Hertz repetition rate. Phase match between red shifted Raman solitons generated by the pump pulse and energy shed by the pump pulse at all frequencies with a group velocity below the pump pulse group velocity may lead to the formation of Cherenkov radiation. The solitons may seed Cherenkov radiation at different wavelengths depending on the actual fiber parameters. This allows extension of generated super continuum light beyond the four wave mixing limit when applying picosecond or nanosecond pump pulses.

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