... he has to shield 405nm, not 700 - so common orange, UV-shielding windows, as used for protecting PCB-labs could be sufficient.
My first windows for diodes with 2Watts@445nm were such windows, stated as blocking all light below 500nm.
When testing with eye, camera and UV-sensor, the blocking of 445nm (and even better for 405nm) is perfect ... but this windows aren't qualified as 'laser-safe', so use at own risk
Viktor
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Aufruf zum Projekt "Müll-freie Meere" - [
reprap.org] -- Deutsche Facebook-Gruppe - [
www.facebook.com]
Call for the project "garbage-free seas" - [
reprap.org]