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Message ID: 1468     Entry time: Tue Aug 5 18:10:31 2014
Author: Evan 
Type: DailyProgress 
Category: optic 
Subject: AlGaAs mirror transmissions; optical contacting 

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.

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