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+{
+ "metadata": {
+ "name": "",
+ "signature": "sha256:d42b95d086e994736fd89da8bf44c85325c991b363e30dcf52a4839620130b97"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "Ch-3 Electroluminescent Sources"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 3.1 Page no 80"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "from __future__ import division\n",
+ "from math import log\n",
+ "#Calculation of barrier potential\n",
+ "#Given data\n",
+ "p=5# # Resistivity of p-region\n",
+ "n=2# # Resistivity of n-region\n",
+ "mu=3900#\n",
+ "k=0.026# #Boltzmann constant\n",
+ "ni=2.5*10**13# #Density of the electron hole pair\n",
+ "e=1.6*10**-19# #charge of electron\n",
+ " \n",
+ "#Barrier potential calculation\n",
+ "r0=(1/p)# # Reflection at the fiber air interface \n",
+ "r1=(1/n)#\n",
+ "m=r1/(mu*e)#\n",
+ "p=6.5*10**14# #Density of hole in p -region\n",
+ "Vb=k*log(p*m/ni**2)#\n",
+ "print \"Barrier potential = %0.3f V\"%Vb\n",
+ "\n",
+ "# The answers vary due to round off error"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Barrier potential = 0.175 V\n"
+ ]
+ }
+ ],
+ "prompt_number": 19
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 3.15 Page no 484"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "# Calculation of external efficiency \n",
+ "#Given data\n",
+ "ne1=0.20# #Total efficiency \n",
+ "V=3# # Voltage applied\n",
+ "Eg=1.43# # Bandgap energy\n",
+ "\n",
+ "# External efficiency\n",
+ "ne=(ne1*Eg/V)*100#\n",
+ "print \"External efficiency of the device = %0.1f %% \"%(ne)#"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "External efficiency of the device = 9.5 % \n"
+ ]
+ }
+ ],
+ "prompt_number": 6
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 3.16 Page no 484"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "from math import exp\n",
+ "# Calculation of ratio of threshold current densities\n",
+ "# Given data\n",
+ "To1=160# # Device temperature\n",
+ "To2=55# # Device temperature\n",
+ "T1=293#\n",
+ "T2=353#\n",
+ "J81=exp(T1/To1)# # Threshold current density \n",
+ "J21=exp(T2/To1)#\n",
+ "J82=exp(T1/To2)## \n",
+ "J22=exp(T2/To2)## \n",
+ "cd1=J21/J81# # Ratio of threshold current densities\n",
+ "cd2=J22/J82#\n",
+ "\n",
+ "print\"Ratio of threshold current densities= %0.2f \"%(cd1)\n",
+ "print\"Ratio of threshold current densities= %0.2f \"%(cd2)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Ratio of threshold current densities= 1.45 \n",
+ "Ratio of threshold current densities= 2.98 \n"
+ ]
+ }
+ ],
+ "prompt_number": 9
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 3.17 Page no 484"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Computation of conversion efficiency \n",
+ "#Given data\n",
+ "i=10*10**-6# # Device current\n",
+ "p=5# # Electrical power\n",
+ "op=50 *10**-6# # Optical power\n",
+ "ip=5*10*10**-3# # Input power\n",
+ "\n",
+ "#Conversion efficiency\n",
+ "c=op/ip*100# \n",
+ "print \"Conversion efficiency = %0.1f %% \"%(c)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Conversion efficiency = 0.1 % \n"
+ ]
+ }
+ ],
+ "prompt_number": 18
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 3.18 Page no 485"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "# Calculation of total power emitted\n",
+ "#Given data\n",
+ "r=0.7# # Emissivity\n",
+ "r0=5.67*10**-8# # Stephen's constant\n",
+ "A=10**-4# # Surface area\n",
+ "T=2000# # Temperature\n",
+ "\n",
+ "# Total power emitted\n",
+ "P=r*r0*A*T**4# \n",
+ "\n",
+ "print\"Total power emitted = %0.1f Watts \"%P"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Total power emitted = 63.5 Watts \n"
+ ]
+ }
+ ],
+ "prompt_number": 14
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 3.19 Page no 485"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "# Computation of total energy\n",
+ "#Given data\n",
+ "h=6.63*10**-34# # Planck constant\n",
+ "v=5*10**14# # Bandgap frequency of laser\n",
+ "N=10**24# # Population inversion density\n",
+ "V=10**-5# # Volume of laser medium\n",
+ "\n",
+ "# Total energy\n",
+ "E=(1/2)*h*v*(N)*V# \n",
+ "\n",
+ "print \"Total energy = %0.1f J \"%E"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Total energy = 1.7 J \n"
+ ]
+ }
+ ],
+ "prompt_number": 13
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 3.20 Page no 485"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "# Computation of pulse power\n",
+ "# Given data\n",
+ "L=0.1# # Length of laser\n",
+ "R=0.8# # Mirror reflectance of end mirror\n",
+ "E=1.7# # Laser pulse energy\n",
+ "c=3*10**8# # Velocity of light\n",
+ "t=L/((1-R)*c)# # Cavity life time\n",
+ "\n",
+ "# Pulse power\n",
+ "p=E/t# \n",
+ "\n",
+ "print\"Pulse power = %0.0f W \"%p"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Pulse power = 1020000000 W \n"
+ ]
+ }
+ ],
+ "prompt_number": 20
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+} \ No newline at end of file
generated by cgit (git 2.34.1) at 2025-04-01 11:11:08 +0000