Abstract: A variable coherence illumination device is disclosed. The variable coherence illumination device includes a light source generator configured to emit a beam and configured to control a wavelength of the beam, a focusing lens configured to focus the beam, a first diffuser on which a beam passing through the focusing lens is incident, a second diffuser facing the first diffuser and rotatable around a rotation axis of the second diffuser, in which a focusing region on which the beam passing through the first diffuser is focused by the focusing lens is formed on the second diffuser, in which the focusing region of the second diffuser is spaced apart from the rotation axis of the second diffuser.

Abstract: A device and a method for measuring a time-resolved thermal image. An embodiment comprises an optical imaging unit comprising a camera and a probe light source, the optical imaging unit emitting a probe optical signal from the probe light source to a sample during a time-resolution time; a control unit for outputting a first trigger signal to the camera, outputting a driving signal to the probe light source such that the probe light source emits the probe light source to the sample during the time-resolution time, outputting a second trigger signal to a bias unit in an turn-on interval, and outputting no second trigger signal to the bias unit in a turn-off interval; and a bias unit for applying a bias signal generated on the basis of the second trigger signal in the turn-on interval to the sample, and applying no bias signal to the sample in the turn-off interval.