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).
Mirror
|
Transmission (ppm) |
Average (ppm) |
| #114 |
142(6) |
142(6) |
| #132 |
162.4(1.4), 159.8(2.1), 163.0(2.1) |
161.7(1.9) |
| #137 |
149.8(3.4), 149.5(2.0), 148.0(2.0) |
149.1(2.5) |
| #141 |
154.9(2.0), 155.4(2.1), 155.4(2.1)
|
155.2(2.1) |
| #143 |
155.6(2.1), 154.7(2.1) |
155.2(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. |