The high resolution imaging result of a laboratory-scale stripmap mode synthetic aperture ladar (SAL) is reported. The high resolution SAL imaging is realized utilizing an equivalent transmitting/receiving aperture of 0.5 mm×0.5 mm，and the high resolution images with picturesque high quality are generated at target distance of 12.9 m. The azimuth resolution synthetic aperture of the SAL images is over 100 times better than the real aperture diffraction limited resolution. The range compressed images of cooperative target and diffusive target, azimuth focused images and phase gradient autofocus (PGA) processed images are given in detail. Experimental figures display a clear SAL image formation process with the typical focused images of every processing step. Experimental results show that PGA has very robust focusing ability in SAL image processing, multiple iterations can greatly improve the imaging quality.