You can make your own laser power meter using an IR detector such as the MLX90614 (or equ.)
Use a high-temp high carbon spray paint (auto engine exhaust black) and paint one side of a borosilicate glass microscope slide cover slip. Use adheasive to glue 1 corner of the slide to a push-pin.
This is your laser target. Mount vertically or horizontally in free air.
I'll post temp chart as soon as I retrieve them from backup. A 1mW laser pointer will have an under 1-deg F temperature rise.
The chart below was calibrated using a semi-professional ($300) laser power meter:
RAW:
