Photocor Complex optical unit

The optical bench (5) and precision turntable (10) are mounted on a rigid base plate (6). He-Ne laser (1) in adjustable laser holders (2) and the focusing optics (3) are fixed on the bench. The incident laser beam can be attenuated by Interchangeable neutral-glass filter (4). The transmitted laser beam is attenuated by an neutral-glass filter (9). The thermostat (7) and the sample-cell holder (8) are coaxial with the turntable axis. The photon counting system (14) is mounted on the rotating arm of turntable (11). The photon counting system comprises the efficient receiving optics (13) with the interchangeable pinholes for selection of aperture (12), low-noise single-photon PMT, and amplifier-discriminator (15). The output signal of the photon counting system is analyzed by the flex-logic correlator, which is connected to personal computer. The personal computer performs the instrument control and data fitting and analysis.