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{
"metadata": {
"name": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 7: Lasers and Holography"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 7.1, Page 410"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Variable declaration\n",
"e = 1.6e-019; # Charge on an electron, eV \n",
"h = 6.62e-034; # Planck's constant, J-s\n",
"c = 3e+008; # Speed of light in vacuum, m/s\n",
"n = 2.8e+019; # Number of photons in laser pulse\n",
"lamda = 7e-007; # Wavelength of the radiation emited by the laser, m\n",
"\n",
"#Calculations\n",
"E = (h*c)/(lamda*e); # Energy of the photon in the laser light, eV\n",
"del_E = E*n; # The energy of laser pulse having n photons, eV\n",
"\n",
"#Result\n",
"print \"The energy of the laser pulse = %4.2e eV\"%del_E\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The energy of the laser pulse = 4.97e+19 eV\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 7.2, Page 411"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from math import *\n",
"\n",
"#Variable declaration\n",
"c = 3.0e8; #velocity of light, m/s\n",
"tc = 0.5e-9 #time duration of pulses(s)\n",
"lamda = 6.5e-7 #wavelength, m\n",
"\n",
"\n",
"#Calculations&Results\n",
"Lc = c*tc; # coherence length, m\n",
"print \"The coherence length is %.2f m\"%Lc\n",
"del_v = 1/tc\n",
"print \"Resultant bandwidth = %.e Hz\"%del_v\n",
"del_lamda = (lamda**2*del_v)/c\n",
"print \"Line width = %.2e m\"%(del_lamda)\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The coherence length is 0.15 m\n",
"Resultant bandwidth = 2e+09 Hz\n",
"Line width = 2.82e-12 m\n"
]
}
],
"prompt_number": 22
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 7.3, Page 411"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from math import *\n",
"\n",
"#Variable declaration\n",
"a = 4e-003; # Coherence width of laser source, m\n",
"lamda = 6e-007; # Wavelength of the pulse, m\n",
"D = 100; # Distance of the surface from laser source, m\n",
"\n",
"#Calculations&Results\n",
"A = 2*lamda/a; # Angular spread of laser beam, radian\n",
"print \"The angular spread = %1.0e radian\"%A\n",
"theta = A/2; # Semi angle, radian\n",
"A_s = pi*(D*theta)**2; # Areal spread of laser beam, Sq.m\n",
"print \"The areal spread = %1.0e Sq.m\"%A_s\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The angular spread = 3e-04 radian\n",
"The areal spread = 7e-04 Sq.m\n"
]
}
],
"prompt_number": 24
}
],
"metadata": {}
}
]
}
|
