Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1990-02-26
1991-05-14
Gonzalez, Frank
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307425, 307428, 350 963, 350353, 350354, 372 6, 372 21, G02B 626
Patent
active
050150545
ABSTRACT:
A method and apparatus is disclosed that provides a laser output beam having a broad bandwidth and an intensity smooth over time. The bandwidth of the laser output can be varied easily by varying the intensity of a broadband source. The present invention includes an optical modulation apparatus comprising a narrowband laser that outputs a horizontally polarized beam (a "signal beam") and a broadband laser that outputs a vertically polarized beam (a "pump beam") whose intensity varies rapidly. The two beam are coupled into a birefringent laser material so that the respective polarizations coincide with the principal axes of the material. As the two beams travel through the material, the polarization preserving properties of the birefringent material maintain the respective polarizations of the two beam; however there is coupling between the two beams as a result of cross phase modulations, which induces a bandwidth change of the signal beam. The amount of bandwidth change is dependent upon the average intensity of the pump beam. The beams are coupled out from the birefringent material and the modulated signal beam is separated by a polarization selector. The modulated signal beam now has a wider bandwidth, and its shape remains smooth in time. This signal beam can be applied to incoherence inducing systems. The different bandwidths required by these different incoherence inducing systems can be obtained by varying the intensity of the pump beam.
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Gaither Roger S.
Gonzalez Frank
Hansen Galen J.
McFarland James D.
Moser William R.
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