defocused IR laser safety question

[gbravetti]

I'm working on a project that involves some defocused IR Lasers, to be detected with an IR camera, I'm talking about a defocused ir laser that will produce a 1 inch diameter dot at 3 feet (2.5 cm at 60cm).

For those guys that deals with laser related maths:

How many mw do you think will be safe?

There will be a protection perimeter of 3 feet so will be impossible for somebody to recive a direct eye exposure of a dot smaller than 1 inch.

Thanks!

 

[Cyparagon]

According to the MPE chart on wikipedia, power density should be less than 2mW/cm². 1 inch diameter is an area of 5cm², so the laser should be 10mW or less.