First, remove the two easy crates at the right end of the chain by pusing them to the target.
Now move every crate and the laser one down, like this:
Nov move every crate and the laser one position to the right.
You should be able to remove the crate on the right side.
Push every remaining item one down again, and the laser one position more. The level should look like this:
Now every crate one left and then every crate one down again. Remove the one to the right. Repeat until all crates are pushed into the target.