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-{
- "metadata": {
-  "name": ""
- },
- "nbformat": 3,
- "nbformat_minor": 0,
- "worksheets": [
-  {
-   "cells": [
-    {
-     "cell_type": "heading",
-     "level": 1,
-     "metadata": {},
-     "source": [
-      "Chapter 11:Lasers"
-     ]
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": [
-      "Example 11.1, Page number 11.6"
-     ]
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      "\n",
-      "import math\n",
-      "\n",
-      "#Variable declaration\n",
-      "lamda = 6943.*10**-10  #wavelength(m)\n",
-      "T = 300.               #temperature(K)\n",
-      "h = 6.626*10**-34      #Planck's constant\n",
-      "c = 3*10**8            #velocity of light(m/s)\n",
-      "K = 8.61*10**-5\n",
-      "\n",
-      "#Calculations\n",
-      "E2_E1 = (h*c)/(lamda*1.6*10**-19) #in eV\n",
-      "N2_N1 = math.exp(-E2_E1/(K*T))\n",
-      "\n",
-      "#Result\n",
-      "print \"The relative population of two states in a ruby laser is\",round((N2_N1/1E-31),2)"
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "The relative population of two states in a ruby laser is 8.2\n"
-       ]
-      }
-     ],
-     "prompt_number": 12
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": [
-      "Example 11.2, Page number 11.14"
-     ]
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      "\n",
-      "#Variable declaration\n",
-      "a1 = 4.   #diameter of laser beam for distance first(m)\n",
-      "a2 = 6.   # diameter of laser beam from second distance(m)\n",
-      "d1 = 1.   #First distance from laser to output beam spot(m)\n",
-      "d2 = 2.   #Second distance from laser to output beam spot(m)\n",
-      "\n",
-      "#Calculation\n",
-      "D = (a2-a1)/(2*(d2-d1))\n",
-      "\n",
-      "#Result\n",
-      "print \"Divergence =\",D,\"milliradian\""
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "Divergence = 1.0 milliradian\n"
-       ]
-      }
-     ],
-     "prompt_number": 14
-    }
-   ],
-   "metadata": {}
-  }
- ]
-}
-\ No newline at end of file