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{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# 10: Lasers"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example number 1, Page number 10-20"
]
},
{
"cell_type": "code",
"execution_count": 2,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"band gap is 0.8 eV\n"
]
}
],
"source": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"c=3*10**8; #velocity of light(m/s)\n",
"h=6.63*10**-34; #plank's constant(Js)\n",
"e=1.6*10**-19; #charge(coulomb)\n",
"lamda=1.55*10**-6; #wavelength(m)\n",
"\n",
"#Calculation\n",
"Eg=h*c/(lamda*e); #band gap(eV) \n",
"\n",
"#Result\n",
"print \"band gap is\",round(Eg,1),\"eV\""
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example number 2, Page number 10-20"
]
},
{
"cell_type": "code",
"execution_count": 5,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"wavelength is 8633 angstrom\n"
]
}
],
"source": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"c=3*10**8; #velocity of light(m/s)\n",
"h=6.63*10**-34; #plank's constant(Js)\n",
"e=1.6*10**-19; #charge(coulomb)\n",
"Eg=1.44*e; #band gap(eV) \n",
"\n",
"#Calculation\n",
"lamda=h*c*10**10/Eg; #wavelength(angstrom)\n",
"\n",
"#Result\n",
"print \"wavelength is\",int(round(lamda)),\"angstrom\""
]
}
],
"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": "2.7.11"
}
},
"nbformat": 4,
"nbformat_minor": 0
}
|
