  We report on fabrication of three dimensional (3D) microstructures in glass
with isotropic spatial resolutions. To achieve high throughput fabrication, we
expand the focal spot size with a low-numerical-aperture lens, which naturally
results in a degraded axial resolution. We solve the problem with simultaneous
spatial temporal focusing which leads to an isotropic laser-affected volume
with a spatial resolution of ~100 micron.
