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Lab laser means a whole different price point for sure... I was hoping that the LPM I mentioned didn't use the heat method for measuring. I read there are other methods such as the one used in the Newport 820, which can be had at low price off E-Bay. Would something like this be able to help...

Brendon, thank you for your near immediate reply. I am not sure if I understand you correctly. Are you saying that temperature shifts from one measurement to the other - in the environment or within the laser - will create an error margin far above the intended accuracy of the measurement?

I am an amateur astronomer and would like to test the reflectivity of my telescope mirrors. My idea is to use one of my laser pointers (nominal 20mW and 100mW) and measure the intensity before and after the reflection in the mirror. Typical mirror reflectivities in astronomy are 96-99%, which...

I am an amateur astronomer and would like to test the reflectivity of my telescope mirrors. My idea is to use one of my laser pointers (nominal 20mW and 100mW) and measure the intensity before and after the reflection in the mirror. Typical mirror reflectivities in astronomy are 96-99%, which...