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diff --git a/Modern_Physics_By_G.Aruldas/Chapter15_1.ipynb b/Modern_Physics_By_G.Aruldas/Chapter15_1.ipynb new file mode 100755 index 00000000..48af1473 --- /dev/null +++ b/Modern_Physics_By_G.Aruldas/Chapter15_1.ipynb @@ -0,0 +1,203 @@ +{
+ "metadata": {
+ "name": "",
+ "signature": "sha256:ede2b0bb266c67744fbe14f69a09ec9b5592c13400e7d0bf2db5fa598ebe9db1"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "15: Lasers"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 15.1, Page number 283"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "k=1.38*10**-23; #boltzmann constant(J/K)\n",
+ "T=1000; #temperature(K)\n",
+ "new1=7.5*10**14; \n",
+ "new2=4.3*10**14;\n",
+ "h=6.626*10**-34; #planck's constant(Js)\n",
+ "\n",
+ "#Calculation\n",
+ "kT=k*T;\n",
+ "#optical region extends from 4000 to 7000 angstrom\n",
+ "hnew=h*(new1-new2); \n",
+ "\n",
+ "#Result\n",
+ "print \"value of kT is\",kT,\"J\"\n",
+ "print \"value of hnew is\",hnew,\"J\"\n",
+ "print \"hnew>kT.therefore spontaneous transitions are dominant ones in optical region\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "value of kT is 1.38e-20 J\n",
+ "value of hnew is 2.12032e-19 J\n",
+ "hnew>kT.therefore spontaneous transitions are dominant ones in optical region\n"
+ ]
+ }
+ ],
+ "prompt_number": 3
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 15.2, Page number 298"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "h=6.626*10**-34; #planck's constant(Js)\n",
+ "c=3*10**8; #velocity of light(m/sec)\n",
+ "P=0.6; #power(watt)\n",
+ "T=30*10**-3; #time(s)\n",
+ "lamda=640*10**-9; #wavelength(m)\n",
+ "\n",
+ "#Calculation\n",
+ "E=P*T; #energy deposited(J)\n",
+ "n=E*lamda/(h*c); #number of photons in each pulse\n",
+ "\n",
+ "#Result\n",
+ "print \"energy deposited is\",E,\"J\"\n",
+ "print \"number of photons in each pulse is\",round(n/10**16,1),\"*10**16\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "energy deposited is 0.018 J\n",
+ "number of photons in each pulse is 5.8 *10**16\n"
+ ]
+ }
+ ],
+ "prompt_number": 6
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 15.3, Page number 298"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "lamda=5000*10**-10; #wavelength(m)\n",
+ "f=0.2; #focal length(m)\n",
+ "a=0.009; #radius of aperture(m)\n",
+ "P=2.5*10**-3; #power(W)\n",
+ "\n",
+ "#Calculation\n",
+ "A=math.pi*lamda**2*f**2/a**2; #area of spot at focal plane(m**2)\n",
+ "I=P/A; #intensity at focus(W/m**2)\n",
+ "\n",
+ "#Result\n",
+ "print \"area of spot at focal plane is\",round(A*10**10,2),\"*10**-10 m**2\"\n",
+ "print \"intensity at focus is\",round(I/10**6,3),\"*10**6 W/m**2\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "area of spot at focal plane is 3.88 *10**-10 m**2\n",
+ "intensity at focus is 6.446 *10**6 W/m**2\n"
+ ]
+ }
+ ],
+ "prompt_number": 11
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 15.4, Page number 298"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "lamda=693*10**-9; #wavelength(m)\n",
+ "D=3*10**-3; #diameter of mirror(m)\n",
+ "d=300*10**3; #distance from earth(m)\n",
+ "\n",
+ "#Calculation\n",
+ "delta_theta=1.22*lamda/D; #angular spread(rad)\n",
+ "a=delta_theta*d; #diameter of beam on satellite(m)\n",
+ "\n",
+ "#Result\n",
+ "print \"angular spread is\",round(delta_theta*10**4,2),\"*10**-4 rad\"\n",
+ "print \"diameter of beam on satellite is\",round(a,2),\"m\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "angular spread is 2.82 *10**-4 rad\n",
+ "diameter of beam on satellite is 84.55 m\n"
+ ]
+ }
+ ],
+ "prompt_number": 15
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+}
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