Patent ID: 6932806

Claim:
An apparatus for assessing irradiation intensity of a laser beam comprising: a reference object on which photo-ablation is caused by irradiating an ultraviolet laser beam for ablation and on which an irradiation region is formed by an ultraviolet laser processing device which processes the reference object in a condition of ablating a predetermined irradiation region to a uniform depth, the reference object having a layer in which a transmitting quantity of illumination light changes in accordance with a thickness; an image obtaining device which obtains an image having information on a gradation contrast change based on the transmitting quantity of the illumination light transmitted through respective positions in the irradiation region of the reference object by projecting the illumination light onto the reference object on which the irradiation region has been formed; and an assessing device which assesses appropriateness of irradiation intensity distribution of the ultraviolet laser processing device based on whether the gradation contrast change is in a permissible range by analyzing information on a luminance change in the irradiation region of the image.