any low power 445nm lasers

[Leodahsan]

Yes.
Back reflection is not an issue at low power.
The only time back reflection has ever damaged one of my diodes is when I used a mirror to reflect >90% of the laser beam of a LOC diode back onto the die.

You need to reflect a high percentage of the power to cause any damage to the cavity, and some diodes are more vulnerable than others due to their construction.

oh yeah, thanks.
would like to see some more info about back reflection