Confocal scanning microimaging system based on short-wave infrared APD (avalanche photodiode)

The invention belongs to the field of the microimaging of applied optics and near-infrared imaging, and establishes one set of confocal scanning microimaging system which can be applied to the area onthe basis of an APD (Avalanche Photodiode) which has a good response on short-wave infrared light (900-1,700nm). On the basis of a commercial confocal scanning microscope, a big NA (Numerical Aperture) objective lens infrared antireflection is used for focusing exciting light to a sample, and the fluorescence of the exciting light is collected. After a short-wave infrared light signal passes through the internal light path of the microscope, the short-wave infrared light signal is introduced out of an output port and enters the detector APD through a collimator and an optical fiber. After theoptical signal is converted into an electric pulse, a high-speed data collection card and a self-designed synchronous circuit are used for collection. After the electric signal is transmitted into acomputer, self-designed sof