Systems and methods are provided for detecting contaminants associated with a target. In one embodiment, a system is provided that comprises a tunable laser configured to transmit an illuminator pulse at a target for a predetermined time duration and a laser Doppler vibrometer system configured to transmit a probe pulse at a surface of the target within the predetermined time duration. The laser Doppler vibrometer system is further configured to detect and analyze at least one return pulse of the probe pulse to determine a surface expansion velocity of contaminants associated with the target due to the illuminator pulse.