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{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"#5: Laser"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"##Example number 5.1, Page number 124"
]
},
{
"cell_type": "code",
"execution_count": 3,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The ratio of propulsion of the two states in a laser is 1.3893 *10**-30\n"
]
}
],
"source": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"t=300; #temperature(K)\n",
"w=698.3*10**-9; #wavelength of photon(m)\n",
"h=6.625*10**-34; #Planck's constant(m^2 Kg/sec)\n",
"c=3*10**8; #velocity of light(m/s)\n",
"Kb=1.38*10**-23; #Boltzmann's constant(m^2 Kg.s^-2 k^-1)\n",
"\n",
"#Calculation\n",
"Ratio=math.exp((-h*c)/(w*Kb*t)); #ratio of propulsion of the two states in a laser\n",
"\n",
"#Result\n",
"print \"The ratio of propulsion of the two states in a laser is\",round(Ratio*10**30,4),\"*10**-30\""
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"##Example number 5.2, Page number 133"
]
},
{
"cell_type": "code",
"execution_count": 7,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The band gap for lnp laser diode is 0.8014 eV\n"
]
}
],
"source": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"w=1.55*10**-6; #wavelength of light emission(m)\n",
"h=6.625*10**-34; #Planck's constant(m^2 Kg/sec)\n",
"c=3*10**8; #velocity of light(m/s)\n",
"e=1.6*10**-19; #charge of electron(c)\n",
"\n",
"#Calculation\n",
"Eg=(h*c)/(w*e); #band gap(eV)\n",
"\n",
"#Result\n",
"print \"The band gap for lnp laser diode is\",round(Eg,4),\"eV\""
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"##Example number 5.3, Page number 133"
]
},
{
"cell_type": "code",
"execution_count": 9,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The long wavelength limit of an extrinsic semiconductor is 6.2109 *10**-5 m\n"
]
}
],
"source": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"E=0.02*1.6*10**-19; #Ionisation energy(J)\n",
"h=6.625*10**-34; #Planck's constant(m^2 Kg/sec)\n",
"c=3*10**8; #velocity of light(m/s)\n",
"\n",
"#Calculation\n",
"w=h*c/E; #long wavelength limit of an extrinsic semiconductor(m)\n",
"\n",
"#Result\n",
"print \"The long wavelength limit of an extrinsic semiconductor is\",round(w*10**5,4),\"*10**-5 m\""
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"##Example number 5.4, Page number 133"
]
},
{
"cell_type": "code",
"execution_count": 11,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The number of photons emitted per minute is 6.562 *10**17 photons/minute\n"
]
}
],
"source": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"E=3.5*10**-3*60; #power output(J/min)\n",
"w=0.621*10**-6; #wavelength of light(m)\n",
"h=6.625*10**-34; #Planck's constant(m^2 Kg/sec)\n",
"c=3*10**8; #velocity of light(m/s)\n",
"\n",
"#Calculation\n",
"e=h*c/w; #energy emitted by one photon(J)\n",
"n=E/e; #The number of photons emitted per minute(photons/minute)\n",
"\n",
"#Result\n",
"print \"The number of photons emitted per minute is\",round(n/10**17,3),\"*10**17 photons/minute\""
]
}
],
"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
}
|
