SharedLab Notebooks / 2018-03-01-182344.ipynbOpen in CoCalc
Lab 4 fits
#Optical Power vs Injection Current at 20C
I(mA) P(micro-Watts)
25.01  45.5
26.04  55.4
27.06  86.7
28.04  502
29.04  1.26 milli-watts scale now
30.04  2.01
31.03  2.72
32.01  3.42
33.00  4.12
34.00  4.84
35.01  5.55
36.00  6.24
37.00  6.93
38.00  7.62
39.00  8.31
40.00  9.00

current = [25.01,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40]
power = [.0455,.0554,.0867,.502,1.26,2.01,2.72,3.42,4.12,4.84,5.55,6.24,6.93,7.62,8.31,9.00]


import numpy as np
import matplotlib.pyplot as plt
current = [25.01,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40]
power = [.0455,.0554,.0867,.502,1.26,2.01,2.72,3.42,4.12,4.84,5.55,6.24,6.93,7.62,8.31,9.00]
plt.scatter(current, power)

<matplotlib.collections.PathCollection at 0x7fde91299a20>
def expfit(x, A, B):
reutrn A*np.e**(B*x)

np.curve_fit(_)

Optical Power vs Current at 25.01C
I(mA)  P(mW)
20.04  .0215
21.00  .0229
22.01  .0246
23.03  .0266
23.99  .0290
25.01  .0321
25.99  .0364
27.01  .0435
28.00  .0592
29.00  .1490
30.00  .8430
30.99  1.550
32.01  2.270
33.00  3.000
33.99  3.690
35.00  4.390
36.00  5.060
37.00  5.750
38.00  6.420
38.99  7.090
40.00  7.780

Optical Power vs Curret at 40C
I(mA)  P(mW)
20.01  .0198
21.01  .0206
22.01  .0219
23.03  .0227
24.04  .0242
25.00  .0256
26.01  .0273
27.00  .0297
28.00  .0311
28.99  .0339
30.00  .0380
31.03  .0441
32.02  .0530
33.00  .0787
33.99  .3550
34.99  1.080
36.00  1.810
37.00  2.510
38.00  3.210
39.01  3.900
40.00  4.570

Same Graph at 45C
I(mA)  P(mW)
20.00  .0180
21.00  .0180
22.00  .0199
23.00  .0208
24.00  .0218
25.00  .0230
26.00  .0243
27.00  .0257
28.00  .0273
29.00  .0293
30.00  .0315
31.00  .0345
32.00  .0382
33.00  .0436
34.00  .0525
35.00  .0743
36.00  .2240
37.00  .9420
38.00  1.640
39.00  2.350
40.00  3.040

15C
I(mA)  P(mW)
20.00  .0250
21.00  .0271
22.00  .0303
23.00  .0347
24.00  .0418
25.00  .0564
26.00  .1810
27.00  .8930
28.00  1.630
30.00  3.040
32.00  4.460
34.00  5.850
36.00  7.260
38.00  8.620
40.00  9.950 (might be due to power meter limit)

30C
I(mA)  P(mW)
25.00  .0290
26.00  .0319
27.00  .0359
28.00  .0418
29.00  .0530
30.00  .0870
31.00  .5650
32.00  1.280
34.00  2.690
36.00  4.090
38.00  5.450
40.00  6.790

35C
I(mA)  P(mW)
26.00  .0285
27.00  .0311
28.00  .0342
29.00  .0389
30.00  .0460
31.00  .0603
32.00  .1310
33.00  .7470
34.00  1.460
35.00  2.160
36.00  2.870
38.00  4.250
40.00  5.620

40C 511.48nm with .810 intensity

LAB EXPERIMENT 8
1) How does the lock-in output signal compare with the input fluorescence signal both in
shape and signal-to-noise.
It will be a DC signal that tells us how much of the frequency is in the photodiode input flouresence signal. The input flouresence signal will be a lot noisier, think line noise and other stuff, while the DC signal will just suffer from the internal noise of the amplifier and DVM.

2) How does the signal shape depend upon the phase setting of the lock-in amplifier?
It will just oscillate with respect to the flourescence signal.