People do carry laser pointers for rescue. There are drawbacks however.
First pointing a laser at an airplane is a serious no,no.
Second you have to make sure you pack it in something water proof.
Third they are difficult to aim at someone far away, especially in the day.
Fourth most are poorly made and have a much higher failure rate than a mirror.

That being said, my thermal imager (which I generally have with me when I'm in the bush) has a laser pointer built in and I find it handy for all kinds of things.

You could change the color of the laser pointer by grabbing a clear sheet, and using a colored permanent marker and run the red or green laser through it, hopefully the laser won't burn through your color filter. As goes for survival it's a great little handy tool.