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{
"metadata": {
"name": "",
"signature": "sha256:6e57ef3dccc3c7eb94a4d9debf60856f056a841840d4cb2d77b1c0cffbc72c7b"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"11: Laser, holography and Fibre optics"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example number 11.1, Page number 317"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"n1=1.53; #refractive index of core\n",
"n2=1.5; #refractive index of cladding\n",
"lamda=1*10**-6; #wavelength(m)\n",
"a=50*10**-6; #core radius(m)\n",
"\n",
"#Calculation\n",
"NA=math.sqrt((n1**2)-(n2**2)); #numerical aperture(m)\n",
"V=((2*math.pi*a)*NA)/lamda; #normalised frequency\n",
"M=(V**2)/2; #number of guided mode\n",
"\n",
"#Result\n",
"print \"normalised frequency is\",round(V,2)\n",
"print \"number of guided mode is\",round(M)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"normalised frequency is 94.72\n",
"number of guided mode is 4486.0\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example number 11.2, Page number 317"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"n1=1.53; #refractive index of core\n",
"n2=1.5; #refractive index of cladding\n",
"lamda=1*10**-6; #wavelength(m)\n",
"\n",
"#Calculation\n",
"NA=math.sqrt((n1**2)-(n2**2)); #numerical aperture(m)\n",
"a=(2.405*lamda)/(2*math.pi*NA); #core radius(m)\n",
"\n",
"#Result\n",
"print \"core radius is less than\",round(a*10**6,2),\"micro m\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"core radius is less than 1.27 micro m\n"
]
}
],
"prompt_number": 7
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example number 11.3, Page number 317"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"NA=0.5; #numerical aperture(m)\n",
"n1=1.54; #refractive index of core\n",
"\n",
"#Calculation\n",
"n2=math.sqrt((n1**2)-(NA**2)); #refractive index of cladding\n",
"n=(n1-n2)/n1; #change in core cladding refractive index\n",
"\n",
"#Result\n",
"print \"refractive index of cladding is\",round(n2,4)\n",
"print \"change in core cladding refractive index is\",round(n,4)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"refractive index of cladding is 1.4566\n",
"change in core cladding refractive index is 0.0542\n"
]
}
],
"prompt_number": 11
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example number 11.4, Page number 318"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"NA=0.5; #numerical aperture(m)\n",
"n1=1.48; #refractive index of core\n",
"\n",
"#Calculation\n",
"n2=math.sqrt((n1**2)-(NA**2)); #refractive index of cladding\n",
"alpha=math.asin(NA); #acceptance angle(radian)\n",
"alpha=alpha*(180/math.pi); #acceptance angle(degrees)\n",
"\n",
"#Result\n",
"print \"refractive index of cladding is\",round(n2,3)\n",
"print \"acceptance angle is\",alpha,\"degrees\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"refractive index of cladding is 1.393\n",
"acceptance angle is 30.0 degrees\n"
]
}
],
"prompt_number": 13
}
],
"metadata": {}
}
]
}
|
