O. Pfister et al., DIVISION BY 3 OF OPTICAL FREQUENCIES BY USE OF DIFFERENCE-FREQUENCY-GENERATION IN NONCRITICALLY PHASE-MATCHED RBTIOASO4, Optics letters, 21(17), 1996, pp. 1387-1389
A new scheme for coherently connecting optical frequencies in a 3:1 ra
tio has been demonstrated. To phase lock a Nd:YAG laser at 1064 nm wit
h a CO overtone laser at 3192 nm, we generated their difference freque
ncy in RbTiOAsO4 (RTA) and beat it against the second harmonic of 3192
nm that was generated in AgGaSe2.