Femtosecond-pulse cavity-dumped solid-state oscillator design and application to ultrafast microscopy
1999
The construction, modeling, and performance characteristics of a
new resonator design for ultrafast cavity-dumped oscillators are
presented. An acousto-optic Bragg cell was incorporated at the end
of the longer arm of a Ti:sapphire oscillator rather than in the
shorter arm as in several recent studies. The new arrangement
improves the pulse intensity stability of the oscillator and
significantly reduces the effort required in construction. The
experimental findings are supported by comparison of the stability
regions of the laser cavities based on the two different
designs. To demonstrate the potential of cavity-dumped oscillators
for spatially resolved ultrafast spectroscopy studies, the pulse
duration is characterized at the focal plane of two achromatic
high-N.A. oil-immersion objectives with different amounts of flat-field
correction. Transform-limited pulse widths as short as 15 fs are
obtained. To our knowledge, this is the shortest pulse duration
measured with true high-N.A. (N.A. > 1) focusing conditions.
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