Abstract
We demonstrate phase locking between two pairs of nanosecond laser pulses generated from independent sources. We achieve phase locking experimentally by separately mixing two uncorrelated dye lasers of frequencies and with a common beam of frequency thereby generating two additional frequencies and We demonstrate that there are well-defined phase relationships between any two-photon process using the and the pair of frequencies versus any two-photon process that uses the and the pair. In particular, interference between the two identical sum frequencies and which we generate in a separate pair of mixing crystals, yields stable interference fringes with measured modulation depths of ±40%. Well-defined phase relationships are especially useful for two-photon versus two-photon coherent control experiments. In addition, the system can be used to transport, with a high degree of stability, the phase of a given input laser frequency to higher frequencies by use of carrier lasers that need not be correlated.
© 2003 Optical Society of America
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