The invention discloses a high-precision
laser divergence angle parameter calibration device. A to-be-tested
laser (1) is focused through a lens (6) after being reflected through an
optical flat (3) and a spectroscope (2); a converge light is divided into two testing light paths of transmission and reflection after passing through a
beam splitter (7); when a focus
light spot not exceeds a photosurface of a
CCD camera (8), the testing light path is the transmission light path; the
CCD camera (8) is located at a lens focal plane position, and the focal spot
diameter is calculated by a formula (2); conversely, the testing light path is reflecting light path; a
ground glass screen (9) is located at the lens focal plane, an imaging
system (10) images the
light spot on the
ground glass screen (9); the focal spot
diameter is calculated by the formula (2). A calibration parameter fn is substituted; a formula (3) is used for calculating the
divergence angle of the to-be-tested
laser; according to the established
confusion disc model base, the collected focal spot is performed with
confusion disc spreading and superposition; thus the
measurement uncertainty introduced by aberration and light path imbalance of the lens (6) is evaluated.