Phase correlation of laser waves with arbitrary frequency spacing.
The theoretically predicted correlation of laser phase fluctuations in Lambda-type interaction schemes is experimentally demonstrated. We show that the mechanism of correlation in a Lambda scheme is restricted to high-frequency noise components, whereas in a double-Lambda scheme, due to the laser phase locking in a closed-loop interaction, it extends to all noise frequencies. In this case the correlation is weakly sensitive to coherence losses. Thus the double-Lambda scheme can be used to correlate electromagnetic fields with carrier frequency differences beyond the GHz regime.
Huss
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AF
Institut für Experimentalphysik, Technische Universität Graz, Petersgasse 16, 8010 Graz, Austria.
Lammegger
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R
Neureiter
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C
Korsunsky
E A
EA
Windholz
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L