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In second harmonic generation, the phase of the optical field is doubledwhich has important implication. Here the phase doubling effect is utilized tosolve a long-standing challenge in power scaling of single frequency laser.When a (-{\pi}/2, {\pi}/2) binary phase modulation is applied to a singlefrequency seed laser to broaden the spectrum and suppress the stimulatedBrillouin scattering in high power fiber amplifier, the second harmonic of thephase-modulated laser will return to single frequency, because the (-{\pi}/2,{\pi}/2) modulation is doubled to (-{\pi}, {\pi}) for the second harmonic. Acompression rate as high as 95% is demonstrated in the experiment limited bythe electronic bandwidth of the setup, which can be improved with optimizeddevices.

Spectral compression by phase doubling in second harmonic generation