Fig. 1: Experimental setup.
From: Thermal light with enhanced oscillating bunching in field-tested photon-counting LIDAR
a Source of bunched photons. The thermal source is an external cavity laser diode operated just below the lasing threshold. The output is filtered in a free-space setup by a bandpass filter and etalon combination. The etalon is placed in a temperature controller and θ is the incident angle of light through the etalon. b and c illustration of the fiber-based and free-space LIDAR setups used for measurements, respectively.
