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Opt Lett. 1996 Sep 1;21(17):1387-9.

Division by 3 of optical frequencies by use of difference-frequency generation in noncritically phase-matched RbTiOAsO(4).

Abstract

A new scheme for coherently connecting optical frequencies in a 3:1 ratio has been demonstrated. To phase lock a Nd:YAG laser at 1064 nm with a CO overtone laser at 3192 nm, we generated their difference frequency in RbTiOAsO(4) (RTA) and beat it against the second harmonic of 3192 nm that was generated in AgGaSe(2).

PMID:
19876361

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