Abstract

Sum frequency generation (SFG) is a method used to extend the wavelength range of efficient Near IR lasers to the visible. Except for third harmonic generation (a special case of SFG), this method has not been widely used due to the difficulty of overlapping pulses from separate lasers. Since SFG is a nonlinear process, short, high peak power pulses (20 nsec wide) are used which must be temporally overlapped to within 3-5 nsec for efficient mixing to occur. A reliable synchronization method would permit the development of a tunable blue- green source by SFG of Ti:Al2O3 (700-950 nm) and Nd:YAG (1 or 1.3 microns).

© 1989 Optical Society of America

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