The government employs a great many safety officers. I doubt many people know all of them. A "reasonable person" may conclude, upon presentation of a "Laser Safety Officer" ID, that you are there on official business.
Depends on context. It's not illegal merely to carry such an ID. It's probably not illegal to give one to a Secret Service agent, either, unless you're trying to deceive them, but that's likely skirting close to the edge.
"Certified Laser Safety Officer" from the Board of Laser Safety ("It should be emphasized that a certificate awarded by the BLS does not constitute a license to practice, nor does it guarantee that a CLSO meets any federal, state or other requirements related to the practice of laser safety.") - http://www.lasersafety.org/uploads/pdf/clso_pp_manual.pdf .
In other words, a 'Certified Laser Safety Officer' is not a government-specific designation.
Depends on context. It's not illegal merely to carry such an ID. It's probably not illegal to give one to a Secret Service agent, either, unless you're trying to deceive them, but that's likely skirting close to the edge.