Which Class 2 laser can potentially cause hazards when using collecting optics?

Class 2 lasers are considered low-power lasers that emit visible light and have an output power of up to 1 milliwatt (mW). The primary safety concern with these lasers is that they can cause eye damage if a person stares into the beam for an extended period. However, Class 2 lasers, in general, are designed to be inherently safe due to the human reflexes that prompt the eye to blink or look away quickly from bright light.

The Class 2M laser, on the other hand, operates within the same power range but poses additional risks when used with collecting optics such as magnifying lenses, binoculars, or camera lenses. These optics can concentrate the beam, increasing the intensity of the light and potentially elevating the risk for eye damage if the focused beam is directed into the eye. The magnifying effect transforms the lower-risk laser into a potentially hazardous one.

Recognizing the specific risks associated with using collecting optics in conjunction with Class 2M lasers is crucial for safely managing laser applications, and this understanding underscores why Class 2M is seen as potentially hazardous when additional optical elements are involved. The other classes mentioned do not have this same potential for increased hazard due to optics.