In this paper, a pulsed laser-assisted micro-dimple formation on chromium film deposited on a cast iron piston ring under different ambient conditions, such as deionized water, coaxially flowing Ar inert gas (200 kPa), atmospheric air and vacuum (0.003 Pa) is reported. A pulsed nanosecond Nd3+: YAG laser with a wavelength of 532 nm, pulsed repetition rate of 10 Hz and with a pulse width of 6 ns was used. The key laser variables selected for study is pulse energy (5 - 30 mJ) and number of pulses (50,100 pulses). The geometrical features like diameter, depth and aspect ratio which are the important attributes that influence the quality of a drilled micro-dimples are comprehensively investigated. In all the ambient conditions, the diameter and the depth of microdimples increased with increase in the laser ablation energy. On the other hand, the diameter increased and the depth of micro-dimple decreased as the ambient condition changed from vacuum, air, inert gas and water. In the case of water ambience, the overall efficiency of laser ablation was lower than that of other media. Nevertheless, it offered process advantage in terms of less heat affected zone and micro cracks.