Unmanned laser need to be UL Approved
The AC power supply must meet safety standards. 

But your question is about the laser.

The FDA says...

TITLE 21--FOOD AND DRUGS
CHAPTER I--FOOD AND DRUG ADMINISTRATION
DEPARTMENT OF HEALTH AND HUMAN SERVICES
SUBCHAPTER J--RADIOLOGICAL HEALTH
PART 1040 -- PERFORMANCE STANDARDS FOR LIGHT-EMITTING PRODUCTS


https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfCFR/CFRSearch.cfm?fr=1040.10

Also Ref


International Electrotechnical Commission (IEC) Standard 60825-1, Ed. 1.2: 2001-08
ANSI Z136 standards are available from the Laser Institute of America (www.laserinstitute.org)


The American National Standards Institute (ANSI) publishes standards for the Safe Use of Lasers2:

Z136.1 American National Standard for the Safe Use of Lasers: 2000
Z136.5 American National Standard for the Safe Use of Lasers in Educational Institutions: 2000
Z136.6 American National Standard for the Safe Use of Lasers Outdoors: 2000 

People who operate Class IIIb lasers should be familiar with these standards to ensure the laser is used safely.