Is it possible to adjust the sensitivity of a Phototransistor?

Hello!
For a university project I use one of those cheap 650nm Lasermodules you can buy on ebay and I want to detect, wether the laser is pointed correctly with a phototransistor. This worked when I build the system in my basement, but now in another room with daylight the transistor is constantly activated and the transistor almost reaches its voltage limit.
Is there a way to change that sensibility to make the laser impact more measurable?

Thank you for your help!

Sure. Shield the phototransistor from the stray light! Put it in on end of a toilet paper roll and aim the roll at the laser.

Paul

If you post your circuit it might be possible to suggest changes.

If you pulse the laser , then look for the AC component on the transistor output .
You can get photo transistors with a base connection - that can be used to change sensitivity.

You could also use a colour filter across the receiver

hammy:
If you pulse the laser , then look for the AC component on the transistor output .
You can get photo transistors with a base connection - that can be used to change sensitivity.

You could also use a colour filter across the receiver

Yes.

Why are there so many pirates here?

OP’s image.

The 6.8k resistor is not needed.

A tunnel is a good idea, also you can experiment with light filters.

Maybe try a reflector, place the detector at the transmitter location.