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We achieved phase-coherent multicolor femtosecond pulse generation by optical phase locking among the pump and its subharmonic signal and idler pulses in an optical parametric oscillator. The ability for coherent superposition of the multicolor pulses is demonstrated in a time-domain measurement. Clear interferometric fringes between two sum-frequency pulses, corresponding to phase stability among the subharmonics, were observed with phase locking.
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Kobayashi et al. (2003) studied this question.
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