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{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"#12: Lasers"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"##Example number 12.1, Page number 12.5"
]
},
{
"cell_type": "code",
"execution_count": 4,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"relative population is 1.0764 *10**-30\n",
"answer given in the book is wrong\n"
]
}
],
"source": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"e=1.6*10**-19; #charge(coulomb)\n",
"h=6.6*10**-34; #planck's constant(J sec)\n",
"c=3*10**8; #velocity of light(m/sec)\n",
"lamda=6943*10**-10; #wavelength(m)\n",
"k=8.61*10**-5;\n",
"T=300; #temperature(K)\n",
"\n",
"#Calculation\n",
"dE=h*c/(e*lamda);\n",
"N2byN1=math.exp(-dE/(k*T)); #relative population\n",
"\n",
"#Result\n",
"print \"relative population is\",round(N2byN1*10**30,4),\"*10**-30\"\n",
"print \"answer given in the book is wrong\""
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"##Example number 12.2, Page number 12.13"
]
},
{
"cell_type": "code",
"execution_count": 7,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"divergence is 1.0 milli radian\n"
]
}
],
"source": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"a1=4*10**-3; #diameter(m)\n",
"a2=6*10**-3; #diameter(m)\n",
"d1=1; #distance(m)\n",
"d2=2; #distance(m)\n",
"\n",
"#Calculation\n",
"theta=(a2-a1)/(2*(d2-d1)); #divergence(radian)\n",
"\n",
"#Result\n",
"print \"divergence is\",theta*10**3,\"milli radian\""
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"##Example number 12.3, Page number 12.45"
]
},
{
"cell_type": "code",
"execution_count": 12,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"spot size is 0.867 micro m\n"
]
}
],
"source": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"s=1*10**-3; #size(m)\n",
"l=1*10**-3; #length(m)\n",
"lamda=650*10**-9; #wavelength(m)\n",
"\n",
"#Calculation\n",
"tantheta=(l/2)/s; \n",
"theta=math.atan(tantheta); #angle(radian)\n",
"sintheta=round(math.sin(theta),2);\n",
"ss=0.6*lamda/sintheta; #spot size(m)\n",
"\n",
"#Result\n",
"print \"spot size is\",round(ss*10**6,3),\"micro m\""
]
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 2",
"language": "python",
"name": "python2"
},
"language_info": {
"codemirror_mode": {
"name": "ipython",
"version": 2
},
"file_extension": ".py",
"mimetype": "text/x-python",
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython2",
"version": "2.7.9"
}
},
"nbformat": 4,
"nbformat_minor": 0
}
|
