Contact
CoCalc Logo Icon
StoreFeaturesDocsShareSupport News AboutSign UpSign In
| Download

Lab 4 fits

Views: 35
Kernel: Python 3 (Anaconda)
#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>
Image in a Jupyter notebook
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.