Are DPSS lasers susceptible to IR back reflections

[m0f]

I'm getting a little bit of IR leakage and wanted to add a filter. The easiest place to mount it would be my pbs cube mount after the cube at 0 degrees, however would reflect it straight back to the lasers.

I'm getting about 150mw of IR between the two dhom's.

So I'm curious if back reflections of IR can be an issue with dpss lasers? Is it a better idea to place it at 45 degrees ?

[-bart-]

As far as i know dpss lasers are not vulnerable to some ir back reflection.
Because thats is what the oc mirror is designed for in the first place : reflecting ir back.

It is questionable if the ir makes it through the pbs and scannermirrors anyways ....
Place the ir filter under a few degrees angle if it makes you feel better.
A full 45 degrees might affect its visible transmittance.

[142laser]

almost all lasers are sensitive to exact retro reflections; try to avoid them. A few degrees is fine.