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 10mHzto1MHz of the locked beat note was 0.43rad, showing tight phase locking. The optical frequency fluctuation between two femtosecond combs was submillihertz, with a 1s averaged counter measurement over 3400s, leading to a long-term femtosecond frequency-comb connection.

© 2005 Optical Society of America

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