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 μm) regions. Using 50 μJ of 760 nm amplified Ti:sapphire light, outputs of tens of microjoules at 666 nm, or several microjoules at 1.77 μm, 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 μm) regions of the spectrum.
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