Abstract
Long-term optical phase-coherent two-color femtosecond pulses were generated by use of passively timing-synchronized Ti:sapphire and Cr:forsterite lasers. The relative carrier-envelope phase relation was fixed by an active feedback loop. The accumulated phase noise from of the locked beat note was , showing tight phase locking. The optical frequency fluctuation between two femtosecond combs was submillihertz, with a averaged counter measurement over , leading to a long-term femtosecond frequency-comb connection.
© 2005 Optical Society of America
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