[Miyamoto, Akutsu]

I calculated calibration factor of EYA Optical Lever.

L : distance from mirror to QPD.(~1130mm)

δ : angle of mirror(Pitch or Yaw)

C1 : This factor transform output of QPD into displacement (mm) (http://klog.icrr.u-tokyo.ac.jp/osl/?r=1360)

C2 : caliblation factor. C2 = 1/(8*L*C1) 　

Result

C2_Pitch = 109.5

C2_Yaw = -103.2

next step, to check this caliblation I used coil-magnet actuator.

I attach this result graphs.

H1,H3-Actuator : Pitch direction

H2,H4-Actuator : Yaw direction

Horizontal axis : Input voltage of actuator

Vertical axis : mirror angle

According to the calculation using 4 actuator efficiency : 3.3um/V

gradiation 16.5 urad/V, but in this test the Pitch is less than 16.5 urad/V, and the Yaw is

larger than 16.5 urad/V.

We should check again.