A visible laser diode will have negligible impact on the receiver
performance of most commercial IR receiver modules, because they
contain an optical bandpass filter, which discriminates against
visible light and obviously pass IR.

The addition of an IR transmission filter to any home made IR receiver
(that doesn't have an integral IR filter) makes sense, because it will
greatly improve the signal-to-noise ratio (in the presence of strong
sunlight) of the receiver.  The use of an IR filter will allow
detection of the IR signal at further distances from the transmitter
than for the situation of using no filter at all.

If an IR receiver doesn't have an IR filter in it, you could easily
"saturate" the receiver, using a visible light source, so that the
receiver would be incapable of detecting an IR signal.  IR-sensitive
semiconductor photodetectors are generally very sensitive to visible
light.  Conversely, visible light-sensitive photodetectors are
generally somewhat sensitive to IR wavelengths.  Ever tried looking at
an IR LED with your camcorder, for instance?

Hope this helps!
Gary