Please use a good op-amp and not the 741, which dates back to 1968. There have been improvements in 41 years.......
LDRs are quite sensitive, and you might not even need an op-amp at all.
If the change in light is very small, you can amplify it with an op-amp, but you need to know what the zero point is. In the simplest form you feed the inverting input of the op-amp from a potentiometer and manually adjust the zero point.
You need some negative feedback on an op-amp or it becomes a switch with either zero or maximum output.
I suspect LDRs are fairly temperature dependent.
For best sensitivity, you need to turn the laser on and off (an optical chopper can do that) and you have a
phase sensitive detector to give the output signal.