Journal
OPTICS LETTERS
Volume 28, Issue 11, Pages 947-949Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.28.000947
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A balanced cross correlator, the optical equivalent of a balanced microwave phase detector, is demonstrated. Its use in synchronizing an octave-spanning Ti:sapphire laser and a 30-fs Cr:forsterite laser yields 300-attosecond timing jitter measured from 10 mHz to 2.3 MHz. The spectral overlap between the two lasers is strong enough to permit direct detection of the difference in carrier-envelope offset frequency between the two lasers. (C) 2003 Optical Society of America.
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