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diff --git a/Applied_Physics-II/chapter4.ipynb b/Applied_Physics-II/chapter4.ipynb new file mode 100755 index 00000000..11b66b2f --- /dev/null +++ b/Applied_Physics-II/chapter4.ipynb @@ -0,0 +1,163 @@ +{ + "metadata": { + "celltoolbar": "Raw Cell Format", + "name": "", + "signature": "sha256:e413b3bea25c7729b7ae1f595bf0f843336be8c682782f6b92de1c93aa46ed9d" + }, + "nbformat": 3, + "nbformat_minor": 0, + "worksheets": [ + { + "cells": [ + { + "cell_type": "heading", + "level": 1, + "metadata": {}, + "source": [ + "Chapter 4: Laser" + ] + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 4.1,Page number 4-27" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "import math\n", + "\n", + "#Given Data:\n", + "lamda=694.3*10**-9 #Wavelength in meter\n", + "T=300 #Temperature in Kelvin\n", + "\n", + "h=6.63*10**-34 #Planck's Constant\n", + "c=3*10**8 #Velocity of light\n", + "K=1.38*10**-21 #Boltzmann Constant\n", + "\n", + "#Calculations:\n", + "delE= h*c/lamda #Energy difference between two energy states N and N0\n", + "\n", + "#N=N0*e^-delE/(K*T)\n", + "R=math.e**(-delE/(K*T)) #R=Ratio of N and N0 i.e.(R=N/N0)\n", + "\n", + "#(Printing mistake in textbook)\n", + "#instead of e^-.692, it has taken e^-69.2\n", + "\n", + "print\"The ratio of population of two energy states is = \",R\n", + "print\" (calculation mistake in book)\"\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "The ratio of population of two energy states is = 0.500588928485\n", + " (calculation mistake in book)\n" + ] + } + ], + "prompt_number": 1 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 4.2,Page number 4-28" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "\n", + "import math\n", + "\n", + "#Given Data:\n", + "lamda=6328*10**-10 #Wavelength in meter\n", + "P=4.5*10**-3 #Power in watts\n", + "h=6.63*10**-34 #Planck's Constant\n", + "c=3*10**8 #Velocity of light\n", + "\n", + "#Calculations:\n", + "delE= h*c/lamda #Energy difference\n", + "#N*delE=P\n", + "N=P/delE #number of photons emitted per second\n", + "\n", + "print\"Number of photons emitted per second is =\",N\n", + "\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Number of photons emitted per second is = 1.43167420814e+16\n" + ] + } + ], + "prompt_number": 3 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 4.3,Page number 4-29" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "import math\n", + "\n", + "#Given Data:\n", + "lamda=780*10**-9 #Wavelength of photon in meter\n", + "P=20*10**-3 #Power of each pulse in watts\n", + "t=10*10**-9 #Duration of each pulse\n", + "h=6.63*10**-34 #Planck's Constant\n", + "c=3*10**8 #Velocity of light\n", + "\n", + "#Calculations:\n", + "delE= h*c/lamda #Energy of each photon\n", + "E=P*t #Energy of each pulse\n", + "\n", + "N=E/delE #Number of photons in each pulse\n", + "print\"Number of photons in each pulse is =\",N\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Number of photons in each pulse is = 784313725.49\n" + ] + } + ], + "prompt_number": 6 + }, + { + "cell_type": "code", + "collapsed": false, + "input": [], + "language": "python", + "metadata": {}, + "outputs": [] + } + ], + "metadata": {} + } + ] +}
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