The American National Standard (ANSI Standard Z136.1-1993) for the Safe Use of Lasers, is universally recognized as the definitive document for establishing an institutional program. Their basic classification system has been adopted by every major national and international standards board, including the Center for Devices and Radiological Health (CDRH) in the U.S. Federal Laser Product Performance Standard which governs the manufacture of lasers in the United States.
The ANSI scheme provides for a total of six laser classes: Class 1, 2, 2a, 3a, 3b, and 4. Higher numbers reflect an increased potential to harm users. According to the standard, knowing the classification of a particular device and comparing the information to the following table will usually eliminate the need to measure laser radiation or perform complex quantitative analyses of hazard potential.
Researchers and Medical Personnel working with Class 3b and/or Class 4 Lasers or Laser Systems must comply with the requirements of this program.
* During operation and maintenance only. Alignment and service procedures of an embedded Class 2, 3, or 4 laser shall require control or administrative procedures appropriate to the class during these functions.