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Message ID: 2031     Entry time: Tue Feb 23 00:22:01 2016
Author: KojiN 
Type: Misc 
Category: PD QE 
Subject: Re-measurement of the QE of the PD without window glass 

The QEs were measured again at every 10 deg incident angle.

The power meter to measure the incident angle was S401C (Thorlabs).

Output voltage was read by the degital multimeter 77 IV (Fluke).

The results are shown in Figs. 1--3.

(About the reflectivities, the data measured in elog2024 are used for now. Those data are obtained with S130C (Thorlabs. error is +/- 7%.))

In Fig. 3, the ratio of the enhanced QE and the not-enhanced QE is shown.

In these figures, the error of the S401C (3%), 77 IV (about 0.4% (depends on the measure value)), and resistances of the readout circuit (assumed to be 1%) are taken into consideration and they are assumed to be independent.

These results are consistent to the data we have measured by last week in the error.

Current errors of the EQEs in Figs. 1 and 2 about +/- 4% and they are mainly determined by the systematic error of the power meter.

Figure 3 claims that the QEs are improved with +/- 0.6% error using our new method.

Fig. 1 Measured QEs.
Fig. 2 Zoomed version of Fig. 1.
Fig. 3 Improvement ratio of the QE.

 

Attachment 1: QE.pdf  5 kB  | Hide | Hide all
QE.pdf
Attachment 2: QE2.pdf  5 kB  | Hide | Hide all
QE2.pdf
Attachment 3: QE3.pdf  4 kB  | Hide | Hide all
QE3.pdf
Attachment 4: QE_enh.txt  679 Bytes  | Hide | Hide all
angle inc(mW,P) error DC(V,P) error enh(V,P) error inc(mW,S) error DC(V,S) error enh(V,S) error
-10 11.45 0.3 1.914 0.007 2.000 0.007 11.48 0.3 1.915 0.007 2.003 0.007
-15 11.50 0.3 1.936 0.007 2.013 0.007 11.53 0.3 1.922 0.007 2.007 0.007
-20 11.56 0.3 1.950 0.007 2.010 0.007 11.62 0.3 1.939 0.007 2.012 0.007
-30 11.53 0.3 1.984 0.007 2.026 0.007 11.65 0.3 1.954 0.007 2.023 0.007
-40 11.55 0.3 2.001 0.007 2.029 0.007 11.58 0.3 1.968 0.007 2.029 0.007
-50 11.66 0.3 1.996 0.007 2.031 0.007 11.60 0.3 1.953 0.007 2.028 0.007
-60 11.67 0.4 1.938 0.007 2.030 0.007 11.68 0.4 1.888 0.007 2.026 0.007
-70 11.69 0.4 1.768 0.006 2.003 0.007 11.68 0.4 1.680 0.006 1.974 0.007
Attachment 5: Ref_QE_wow.txt  452 Bytes  | Hide | Hide all
angle Ref(mW,P) error DC(V,P) error Ref(mW,S) error DC(V,S) error
-10 0.480 0.001 2.02 0.02 0.504 0.001 2.02 0.02
-15 0.434 0.001 2.02 0.02 0.487 0.001 2.02 0.02
-20 0.367 0.001 2.04 0.02 0.454 0.001 2.04 0.02
-30 0.217 0.001 2.06 0.02 0.363 0.001 2.06 0.02
-40 0.136 0.001 2.06 0.02 0.313 0.002 2.04 0.02
-50 0.197 0.002 2.06 0.02 0.408 0.002 2.02 0.02
-60 0.532 0.002 1.98 0.02 .806 0.005 1.94 0.02
-70 1.54 0.01 1.80 0.02 2.04 0.02 1.72 0.02
Attachment 6: QE_enh_cal_NK.m  2 kB  | Hide | Hide all
% 
filename='QE_enh.txt';
delimiterIn = ' ';
headerlinesIn = 1;
A = importdata(filename,delimiterIn,headerlinesIn);

filename='Ref_QE_wow.txt';
B = importdata(filename,delimiterIn,headerlinesIn);

phiP=A.data(:,2);
... 74 more lines ...
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