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  Coating Ring-down Measurement Lab elog  Not logged in ELOG logo
Message ID: 238     Entry time: Fri Dec 9 13:13:32 2016
Author: Gabriele 
Type: General 
Category: Measurements 
Subject: Silicon sample 

Silicon wafer from WRS materials, diameter 3", thickness 356-406 microns.

2016-12-09

  • 1:00pm, retaining ring and pins installed back, optical system realigned to horizontal reference
  • 1:08pm, in chamber, balanced. Since silicon reflection is higher than silica, installed a ND0.3 to avoid QPD saturation
  • 1:10pm, roughing pump on
  • 1:23pm, turbo pump on
  • Excitations
    • Quiet time before excitation: 1165359305
      Excitation (broad band) at 1165359337 (60 s)
      Quiet time after excitation: 1165359399

2016-12-12

  • Excitation:
    • Quiet time before excitation: 1165611248
      Broadband excitation
      Quiet time after excitation: 1165611382
    • Quiet time before excitation: 1165611540
      100-1000 Hz excitation
      Quiet time after excitation: 1165611619
  • 2:05pm, pumps stopped

​Results

% Freq        Q                Q (C.I. 95%)        Q (C.I. 95%)
2043.9        6.5333e+03        6.5061e+03        6.5607e+03
2307.9        1.6958e+04        1.6895e+04        1.7022e+04
3671.0        2.7458e+04        2.7324e+04        2.7595e+04
4909.0        4.1605e+04        4.1322e+04        4.1892e+04
5268.1        2.5236e+04        2.5186e+04        2.5286e+04
6079.0        2.6835e+04        2.6311e+04        2.7382e+04
7317.4        5.1946e+04        5.1799e+04        5.2095e+04
7391.0        1.3702e+04        1.3441e+04        1.3973e+04
8586.6        5.3491e+04        5.2271e+04        5.4769e+04
8719.9        5.4501e+04        5.3904e+04        5.5111e+04
9600.4        6.6514e+04        6.6390e+04        6.6639e+04
9622.1        3.0667e+04        3.0505e+04        3.0830e+04
10507.0        8.1040e+04        8.0965e+04        8.1115e+04
11053.9        6.0651e+04        5.9853e+04        6.1471e+04
11397.5        5.2873e+04        5.2242e+04        5.3520e+04
11950.0        3.2045e+04        3.1514e+04        3.2593e+04
12083.0        8.8181e+04        8.7571e+04        8.8800e+04
12330.6        4.9761e+04        4.8997e+04        5.0549e+04
13799.0        4.8752e+04        4.7609e+04        4.9951e+04
14911.9        8.7301e+04        8.6550e+04        8.8066e+04
15849.6        3.7500e+04        3.6882e+04        3.8139e+04
17381.4        7.5930e+04        7.4582e+04        7.7328e+04
17585.0        9.7947e+04        9.6811e+04        9.9110e+04
17597.0        2.8465e+04        2.7318e+04        2.9712e+04
18310.4        9.0019e+04        8.9175e+04        9.0879e+04
18542.1        6.8287e+04        6.7506e+04        6.9088e+04
18547.5        1.4131e+05        1.4017e+05        1.4248e+05
18774.9        1.0588e+05        1.0490e+05        1.0687e+05
19066.6        8.0216e+04        7.8924e+04        8.1551e+04
20253.5        9.6914e+04        9.4540e+04        9.9411e+04
20463.0        1.0020e+05        9.9323e+04        1.0109e+05
21188.2        1.1931e+05        1.1851e+05        1.2012e+05
21828.5        1.4420e+05        1.4290e+05        1.4552e+05
21837.5        1.5768e+05        1.5639e+05        1.5899e+05
22976.0        5.6472e+04        5.6229e+04        5.6717e+04
23356.5        1.2871e+05        1.2729e+05        1.3017e+05
23398.5        1.4698e+05        1.4422e+05        1.4984e+05
23455.0        1.1209e+05        1.0950e+05        1.1479e+05
23457.7        1.0716e+05        1.0509e+05        1.0932e+05
23496.0        1.4477e+05        1.4295e+05        1.4665e+05
23703.5        1.5954e+05        1.5695e+05        1.6222e+05
23993.0        1.3344e+05        1.3183e+05        1.3510e+05
24758.2        1.4752e+05        1.4655e+05        1.4850e+05
24952.6        1.3025e+05        1.2972e+05        1.3077e+05
25139.0        3.3941e+04        3.3575e+04        3.4316e+04
25298.5        1.0825e+05        1.0603e+05        1.1056e+05
25387.1        1.3101e+05        1.3055e+05        1.3148e+05
25391.7        1.2021e+05        1.2011e+05        1.2032e+05
26752.9        1.0624e+05        1.0595e+05        1.0653e+05
26762.0        1.8838e+05        1.8490e+05        1.9200e+05
26838.0        6.9555e+04        6.7066e+04        7.2237e+04
27147.7        1.0675e+05        1.0571e+05        1.0780e+05
27698.0        8.3204e+04        8.1975e+04        8.4471e+04
28101.4        1.7792e+05        1.7748e+05        1.7836e+05
28109.4        8.9486e+04        8.8527e+04        9.0466e+04
28480.6        1.1985e+05        1.1934e+05        1.2037e+05
28972.0        4.5087e+04        4.3490e+04        4.6806e+04
28979.3        1.3823e+05        1.3750e+05        1.3897e+05
29044.6        1.7261e+05        1.7177e+05        1.7347e+05
29166.4        1.7820e+05        1.7785e+05        1.7855e+05
29222.0        1.8986e+05        1.8640e+05        1.9345e+05
29451.0        3.4557e+04        3.3927e+04        3.5211e+04
30284.4        1.9755e+05        1.9701e+05        1.9810e+05
30691.3        9.7139e+04        9.6728e+04        9.7553e+04
31228.6        1.2060e+05        1.2028e+05        1.2092e+05
32159.5        2.0041e+05        1.9800e+05        2.0288e+05
32226.8        7.3880e+04        7.3119e+04        7.4658e+04
32366.0        2.0220e+05        2.0185e+05        2.0255e+05

 

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