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| author | kinitrupti | 2017-05-12 18:53:46 +0530 |
|---|---|---|
| committer | kinitrupti | 2017-05-12 18:53:46 +0530 |
| commit | 6279fa19ac6e2a4087df2e6fe985430ecc2c2d5d (patch) | |
| tree | 22789c9dbe468dae6697dcd12d8e97de4bcf94a2 /Applied_Physics_by_P._K._Palanisamy/Chapter10_1.ipynb | |
| parent | d36fc3b8f88cc3108ffff6151e376b619b9abb01 (diff) | |
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Removed duplicates
Diffstat (limited to 'Applied_Physics_by_P._K._Palanisamy/Chapter10_1.ipynb')
| -rwxr-xr-x | Applied_Physics_by_P._K._Palanisamy/Chapter10_1.ipynb | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/Applied_Physics_by_P._K._Palanisamy/Chapter10_1.ipynb b/Applied_Physics_by_P._K._Palanisamy/Chapter10_1.ipynb new file mode 100755 index 00000000..4ad21f3b --- /dev/null +++ b/Applied_Physics_by_P._K._Palanisamy/Chapter10_1.ipynb @@ -0,0 +1,167 @@ +{
+ "metadata": {
+ "name": "",
+ "signature": "sha256:04df0fd624434d43d67fac6cabd770a44e2109835e3a6832f168a8a4e92f27c9"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "10: Lasers"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 10.1, Page number 10.6"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "c = 3*10**8 #speed of light(m/sec)\n",
+ "h = 6.6*10**-34 #planck's constant\n",
+ "e = 1.6*10**-19\n",
+ "T = 300 #temperature(K)\n",
+ "K = 8.61*10**-5\n",
+ "lamda = 6943 #wavelength, angstrom\n",
+ "\n",
+ "#Calculation\n",
+ "lamda = lamda*10**-10 #wavelength(m)\n",
+ "#let E2 - E1 be E\n",
+ "E = h*c/lamda #energy(J)\n",
+ "E = E/e #energy(eV)\n",
+ "#let population ratio N2/N1 be N\n",
+ "N = math.exp(-E/(K*T));\n",
+ "\n",
+ "#Result\n",
+ "print \"relative population of 2 states is\",round(N/1e-30,3),\"*10^-30\"\n",
+ "print \"answer given in the book is wrong\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "relative population of 2 states is 1.076 *10^-30\n",
+ "answer given in the book is wrong\n"
+ ]
+ }
+ ],
+ "prompt_number": 2
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 10.2, Page number 10.14"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "a2 = 6 #spot diameter(mm)\n",
+ "a1 = 4 #spot diameter(mm)\n",
+ "d2 = 2 #distance from laser(m)\n",
+ "d1 = 1 #distance from laser(m)\n",
+ "\n",
+ "#Calculation\n",
+ "a2 = a2*10**-3 #spot diameter(m)\n",
+ "a1 = a1*10**-3 #spot diameter(m)\n",
+ "theta = (a2-a1)/(2*(d2-d1)) #divergence(radian)\n",
+ "theta = theta*10**3 #divergence(milli radian)\n",
+ "\n",
+ "#Result\n",
+ "print \"divergence is\",theta,\"milli radian\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "divergence is 1.0 milli radian\n"
+ ]
+ }
+ ],
+ "prompt_number": 3
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 10.3, Page number 10.46"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "n = 1 #for air\n",
+ "lamda = 650 #wavelength(nm)\n",
+ "bs = 1 #beam size(mm)\n",
+ "fl = 1 #focal length of lens(mm)\n",
+ "\n",
+ "#Calculation\n",
+ "lamda = lamda*10**-9 #wavelength(m)\n",
+ "bs = bs*10**-3 #beam size(m)\n",
+ "fl = fl*10**-3 #focal length of lens(m)\n",
+ "tan_theta = fl/(2*bs) #value of tan_theta\n",
+ "theta = math.atan(tan_theta)\n",
+ "NA = n*math.sin(theta)\n",
+ "NA = math.ceil(NA*10**2)/10**2; #rounding off to 2 decimals\n",
+ "ss = 0.6*lamda/NA #spot size(m)\n",
+ "ss = ss*10**6; #spot size(micro metre)\n",
+ "ss = math.ceil(ss*10**3)/10**3; #rounding off to 4 decimals\n",
+ "\n",
+ "#Result\n",
+ "print \"spot size is\",ss,\"micro metre\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "spot size is 0.867 micro metre\n"
+ ]
+ }
+ ],
+ "prompt_number": 6
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+}
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