High dynamic range laser far-field focal spot measurement device and method

The invention relates to a high dynamic range laser far-field focal spot measurement device and method. The high dynamic range laser far-field focal spot measurement device comprises a laser beam shrinkage or expander system, an attenuation wedge plate, a spectroscope, a scientific grade CCD (Charge Coupled Device) detector, a micro lens array, a CCD detector and a control computer; the laser beam shrinkage or expander system, the attenuation wedge plate and the spectroscope are arranged on the same light path in turn; the light incident to the spectroscope is divided into the transmission light and the reflected light through the spectroscope; the scientific grade CCD detector is arranged on a light path of the reflected light after the reflected light passes through the spectroscope; the micro lens array and the CCD detector are arranged on a light path of the refracted light in turn after the refracted light passes through the spectroscope; the scientific grade CCD detector and the CCD detector are connected with the control computer. According to the high dynamic range laser far-field focal spot measurement device and method, the dynamic measurement on high dynamic range laser far-field focal spots can be achieved and the measurement accuracy can be well ensured.