  We propose a high resolution spatial diagnostic method via inserting a
millimeter-gap grating into the collimated terahertz beam to monitor the minute
variation of the terahertz beam in strong-field terahertz sources, which is
difficult to be resolved in conventional terahertz imaging systems. To verify
the method, we intentionally fabricate tiny variations of the terahertz beam
through tuning the iris for the infrared pumping beam before the tilted
pulse-front pumping (TPFP) setups. The phenomena can be well explained by the
the theory based on tilted pulse front technique and terahertz diffraction. We
believe our observation not only help further understand the mechanism of
intense terahertz generation, but also may be useful for strong-field terahertz
applications.
