| Abstract | High power, 20 Hz repetition rate difference frequency mixing of externally synchronized femtosecond Ti:sapphire laser radiation with harmonics of a phase locked picosecond Nd:YAG laser, in a BBO crystal, is shown to produce femtosecond pulses in the visible (666 nm) and infrared (1.77 [mu]m) regions. Using 50 [mu]J of 760 nm amplified Ti:sapphire light, outputs of tens of microjoules at 666 nm, or several microjoules at 1.77 [mu]m, were achieved. This technique can be used to extend the tuning range (720-1000 nm) of the Ti:sapphire laser into the visible (550-700 nm) and the infrared (1.1-2.0 [mu]m) regions of the spectrum. |
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