Pulsed lasers are used for simultaneous single-beam three-dimensional optical trapping of and second-harmonic generation in 50–100-nm nonlinear particles. The emission power of the frequency-doubled light, the trapping stability, and the particle degradation are investigated for KTP and LiNbO3 particles trapped by 25-kHz-repetition-rate Q-switched Nd:YAG and 76-MHz mode-locked Ti:sapphire l a s e r s . Typically 1 pW-10 nW of frequency-doubled light is detected from stably trapped particles. The particles may be used as probes for nonintrusively scanned near-field optical microscopy.
© 1995 Optical Society of America
L. Malmqvist and H. M. Hertz, "Second-harmonic generation in optically trapped nonlinear particles with pulsed lasers," Appl. Opt. 34, 3392-3397 (1995)