Fiber amplifier system resistance to nonlinear spectral broadening and decoherence
AssigneeNorthrop Grumman Systems Corporation
InventorGregory D. Goodno
Life of this patent
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Abstract
A method for reducing nonlinear frequency shifts and suppressing stimulated Brillouin scattering (SBS) in a fiber laser amplifier system. The method includes providing a seed beam having a certain wavelength and frequency modulating the seed beam with an RF waveform to spectrally broadening the seed beam, where the RF waveform is a relatively slow-speed waveform having a large modulation depth. The method also includes amplifying the frequency modulated seed beam with an amplifier having a large nonlinear phase shift and exhibiting frequency modulation (FM) to amplitude modulation (AM) conversion, where the modulation depth is much larger than the nonlinear phase shift of the amplifier.
Claims20
A method for reducing nonlinear frequency shifts and suppressing stimulated Brillouin scattering (SBS) in a fiber laser amplifier system, said method comprising:
- providing at least one seed beam having a certain wavelength;
- frequency modulating the at least one seed beam with an RF waveform to spectrally broaden the seed beam, said RF waveform being a relatively slow-speed waveform having a large modulation depth;
- and
- amplifying the modulated seed beam with an amplifier having a large nonlinear phase shift and exhibiting frequency modulation (FM) to amplitude modulation (AM) conversion, wherein the modulation depth is much larger than the nonlinear phase shift.
A method for reducing nonlinear frequency shifts and suppressing stimulated Brillouin scattering (SBS) in a fiber laser amplifier system, said method comprising:
- providing at least one seed beam having a certain wavelength;
- frequency modulating the at least one seed beam with an RF waveform to spectrally broaden the seed beam, said RF waveform being a relatively slow-speed waveform having a large modulation depth;
- and
- amplifying the frequency modulated seed beam with an amplifier.
A system for reducing nonlinear frequency shifts and suppressing stimulated Brillouin scattering (SBS) in a fiber laser amplifier system, said system comprising:
- means for providing at least one seed beam having a certain wavelength;
- means for frequency modulating the at least one seed beam with an RF waveform to spectrally broaden the seed beam, said RF waveform being a relatively slow-speed waveform and having a large modulation depth;
- and
- means for amplifying the frequency modulated at least one seed beam where the means for amplifying has a large nonlinear phase shift and exhibiting frequency modulation (FM) to amplitude modulation (AM) conversion, wherein the modulation depth is much larger than the nonlinear phase shift.
Dependencies are inferred from the claim text.