I used the ThorLabs power meter to get the transmission coefficients for the five AlGaAs mirrors.
For each measurement, I wrote down the incident power (20 mW nominal), the transmitted power (≈3.5 µW, depending on the mirror and background light level), and the transmitted power with the beam blocked (to get the dark power).
154.9(2.0), 155.4(2.1), 155.4(2.1)
In other news, Tara bonded mirror #114 to spacer #95. The contacting seems to be tough going because of some recalcitrant smudges on the substrate surfaces.