  We have developed a method for producing spatially stable micron-scale liquid
targets of flexible shapes at kilohertz repetition rate for use in air and
vacuum, by perturbing 5 and 30 \mu m diameter streams with femtosecond laser
pulses and monitoring the temporal development of the perturbation. Using
water, we have produced features such as 2.1 \mu m diameter droplet and 1.3 \mu
m diameter neck with less than 0.3 \mu m shot-to-shot variation, with prospects
for further reduction in size and variability. The use of such micron-scale
targets can be expected to prevent conductive heat dissipation, enhance field
strength for ion acceleration and allow spatially-deterministic laser-cluster
experiments.
