ISO 11254-3:2006 describes a test procedure for assurance of power density (energy density) handling capability of optical surfaces, both coated and uncoated.ISO 11254-3:2006 specifies this procedure by providing two test methods for assurance of the power density (energy density) handling capability of optical surfaces.The first method provides a rigorous test that fulfils requirements at a specified confidence level in the knowledge of potential defects.The second method provides a simple test for an empirically derived test level, allowing an inexpensive test.