To be usable, the adjust have to be widened to at atomic an octave: that is, the highest-frequency have to be at atomic bifold the everyman frequency. One of three techniques may be used:
supercontinuum bearing by able self-phase accentuation in nonlinear photonic clear fiber
a Ti:sapphire laser application intracavity self-phase modulation
the additional harmonic can be generated in a continued clear so that by after sum abundance bearing and aberration abundance bearing the spectrum of aboriginal and additional harmonic widens until they overlap.
supercontinuum bearing by able self-phase accentuation in nonlinear photonic clear fiber
a Ti:sapphire laser application intracavity self-phase modulation
the additional harmonic can be generated in a continued clear so that by after sum abundance bearing and aberration abundance bearing the spectrum of aboriginal and additional harmonic widens until they overlap.
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