Using a modulated laser as @jremington suggested seems like the best way to go. That's how IR remotes work. Doing so would greatly reduce ambient light sensitivity and at the same time allow @anon89368908 to use a significantly lower optical power.
At a significant incease in hardware complexity and cost. @anon89368908 would have to start over from scratch
IR Remote boards are cheap and simple.
IR is not 532nm
Obviously. The laser source OP selected for this project may not have been the best choice. But, we don't know what all the requirements are.
I think @anon89368908 made it clear
waveshare has a red 5 mW laser-sensor which has a modulated laser.
The wave-share specs say range 0,8 m (max 1,5m).
This is valid for white or at least grey objects that reflect / spread the light into all directions.
I tested this laser-sensor with a cat-eye-reflector.
Which reflects all light back to exactly the same direction as it was coming from.
(This IS the cat-eye-effect and this is what makes them shine so bright)
At a distance of 200 feet I had no more room to go any further away
sensor still switching properly between beam present / beam not present
This sensor has a collimator lens that is concentrating the light on the fototransistor
If you would like to use the green laser and the posted receivers
I would put the optical sensor in a black tube 5 inch long
not shining inner surface = non-glossy surface.
The same standards that you "read and agreed" to, then immediately disobeyed? Do not make others regret your choices.
That is my mistake and I regret my language in stating standards should be set, with myself not following them. Thanks to all for the information and recommendations.
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Stefan
Let me first apologize for my earlier response. I'm not happy with it and should have responded with the necessary information and not with what I did. I appreciate your suggestions and plan on seeing what they can do. I offer the rest of the community the same apology and thanks for the suggestions they have made.
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I've ordered the sensors your suggested. In looking at the reflectors, do I assume the "german" reflectors are the better choice. In researching the models, it appears the ones available in bulk from Amazon are Chinese made and has lines in the lens from the process, which I would think causes the beam to be possibly reflected back inaccurately. The German model appears to not have any ridge lines, as in the picture you included above. Thoughts? Thanks.