is there any kind of photodiode avilable that is sunlight protected.that is it recieves light only thru the laser beam which im using as a transmitter n rejects all other light sources particularly sunlight.
try making a filter from a combination of red and green perspex. Perhaps you can modulate the IR source. On the receiver you can then filter out un-modulated IR light. Do a search on IR remote controls to see how this is done