From 476705d693c7122d34f9b049fa79b935405c9b49 Mon Sep 17 00:00:00 2001 From: prashantsinalkar Date: Tue, 14 Apr 2020 10:19:27 +0530 Subject: Initial commit --- Engineering_Physics_by_G_Aruldhas/11-LASERS.ipynb | 216 ++++++++++++++++++++++ 1 file changed, 216 insertions(+) create mode 100644 Engineering_Physics_by_G_Aruldhas/11-LASERS.ipynb (limited to 'Engineering_Physics_by_G_Aruldhas/11-LASERS.ipynb') diff --git a/Engineering_Physics_by_G_Aruldhas/11-LASERS.ipynb b/Engineering_Physics_by_G_Aruldhas/11-LASERS.ipynb new file mode 100644 index 0000000..10e88b8 --- /dev/null +++ b/Engineering_Physics_by_G_Aruldhas/11-LASERS.ipynb @@ -0,0 +1,216 @@ +{ +"cells": [ + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "# Chapter 11: LASERS" + ] + }, +{ + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 11.1: Ratio_of_spontaneous_and_stimulated_emission.sci" + ] + }, + { +"cell_type": "code", + "execution_count": null, + "metadata": { + "collapsed": true + }, + "outputs": [], +"source": [ +"// Scilab Code Ex11.1: Page-249 (2010)\n", +"h = 6.626e-034; // Planck's constant, Js\n", +"c = 3e+08; // Speed of light in free space, m/s\n", +"k = 1.38e-023; // Boltzmann constant, J/K\n", +"T = 300; // Temperature at absolute scale, K\n", +"lambda = 5500e-010; // Wavelength of visible light, m\n", +"rate_ratio = exp(h*c/(lambda*k*T))-1; // Ratio of spontaneous emission to stimulated emission\n", +"printf('\nThe ratio of spontaneous emission to stimulated emission for visible region = %1.0e', rate_ratio);\n", +"lambda = 1e-02; // Wavelength of microwave, m\n", +"rate_ratio = exp(h*c/(lambda*k*T))-1; // Ratio of spontaneous emission to stimulated emission\n", +"printf('\nThe ratio of spontaneous emission to stimulated emission for microwave region = %6.4f', rate_ratio);\n", +"\n", +"// Result\n", +"// The ratio of spontaneous emission to stimulated emission for visible region = 8e+037\n", +"// The ratio of spontaneous emission to stimulated emission for microwave region = 0.0048" + ] + } +, +{ + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 11.2: Energy_of_excited_state_of_laser_system.sci" + ] + }, + { +"cell_type": "code", + "execution_count": null, + "metadata": { + "collapsed": true + }, + "outputs": [], +"source": [ +"// Scilab Code Ex11.2: Page-250 (2010)\n", +"e = 1.6e-019; // Energy equivalent of 1 eV, J/eV\n", +"h = 6.626e-034; // Planck's constant, Js\n", +"c = 3e+08; // Speed of light in free space, m/s\n", +"lambda = 690e-009; // Wavelength of laser light, m\n", +"E_lower = 30.5; // Energy of lower state, eV\n", +"E = h*c/(lambda*e); // Energy of the laser light, eV\n", +"E_ex = E_lower + E; // Energy of excited state of laser system, eV\n", +"printf('\nThe energy of excited state of laser system = %4.1f eV', E_ex);\n", +"\n", +"// Result\n", +"// The energy of excited state of laser system = 32.3 eV" + ] + } +, +{ + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 11.3: Condition_of_equivalence_of_stimulated_and_spontaneous_emission.sci" + ] + }, + { +"cell_type": "code", + "execution_count": null, + "metadata": { + "collapsed": true + }, + "outputs": [], +"source": [ +"// Scilab Code Ex11.3: Page-250 (2010)\n", +"h = 6.626e-034; // Planck's constant, Js\n", +"k = 1.38e-023; // Boltzmann constant, J/K\n", +"// Stimulated Emission = Spontaneous Emission <=> exp(h*f/(k*T))-1 = 1 i.e.\n", +"// f/T = log(2)*k/h = A\n", +"A = log(2)*k/h; // Frequency per unit temperature, Hz/K\n", +"printf('\nThe stimulated emission equals spontaneous emission iff f/T = %4.2e Hz/K', A);\n", +"\n", +"// Result\n", +"// The stimulated emission equals spontaneous emission iff f/T = 1.44e+010 Hz/K " + ] + } +, +{ + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 11.4: Area_and_intensity_of_image_formed_by_laser.sci" + ] + }, + { +"cell_type": "code", + "execution_count": null, + "metadata": { + "collapsed": true + }, + "outputs": [], +"source": [ +"// Scilab Code Ex11.4: Page-250 (2010)\n", +"lambda = 500e-009; // Wavelength of laser light, m\n", +"f = 15e-02; // Focal length of the lens, m\n", +"d = 2e-02; // Diameter of the aperture of source, m\n", +"a = d/2; // Radius of the aperture of source, m\n", +"P = 5e-003; // Power of the laser, W\n", +"A = %pi*lambda^2*f^2/a^2; // Area of the spot at the focal plane, metre square\n", +"I = P/A; // Intensity at the focus, W per metre square \n", +"printf('\nThe area of the spot at the focal plane = %4.2e metre square', A);\n", +"printf('\nThe intensity at the focus = %4.2e watt per metre square', I);\n", +"\n", +"// Result\n", +"// The area of the spot at the focal plane = 1.77e-010 metre square\n", +"// The intensity at the focus = 2.83e+007 watt per metre square " + ] + } +, +{ + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 11.5: Rate_of_energy_released_in_a_pulsed_laser.sci" + ] + }, + { +"cell_type": "code", + "execution_count": null, + "metadata": { + "collapsed": true + }, + "outputs": [], +"source": [ +"// Scilab Code Ex11.5: Page-251 (2010)\n", +"h = 6.626e-034; // Planck's constant, Js\n", +"c = 3e+08; // Speed of light in free space, m/s\n", +"lambda = 1064e-009; // Wavelength of laser light, m\n", +"P = 0.8; // Average power output per laser pulse, W\n", +"dt = 25e-003; // Pulse width of laser, s\n", +"E = P*dt; // Energy released per pulse, J\n", +"N = E/(h*c/lambda); // Number of photons in a pulse\n", +"printf('\nThe energy released per pulse = %2.0e J', E);\n", +"printf('\nThe number of photons in a pulse = %4.2e', N);\n", +"\n", +"// Result\n", +"// The energy released per pulse = 2e-002 J\n", +"// The number of photons in a pulse = 1.07e+017 " + ] + } +, +{ + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 11.6: Angular_and_linear_spread_of_laser_beam.sci" + ] + }, + { +"cell_type": "code", + "execution_count": null, + "metadata": { + "collapsed": true + }, + "outputs": [], +"source": [ +"// Scilab Code Ex11.6:Page-251 (2010)\n", +"lambda = 693e-009; // Wavelength of laser beam, m\n", +"D = 3e-003; // Diameter of laser beam, m\n", +"d_theta = 1.22*lambda/D; // Angular spread of laser beam, rad\n", +"d = 300e+003; // Height of a satellite above the surface of earth, m\n", +"a = d_theta*d; // Diameter of the beam on the satellite, m\n", +"printf('\nThe height of a satellite above the surface of earth = %4.2e rad', d_theta);\n", +"printf('\nThe diameter of the beam on the satellite = %4.1f m', a);\n", +"\n", +"// Result\n", +"// The height of a satellite above the surface of earth = 2.82e-004 rad\n", +"// The diameter of the beam on the satellite = 84.5 m " + ] + } +], +"metadata": { + "kernelspec": { + "display_name": "Scilab", + "language": "scilab", + "name": "scilab" + }, + "language_info": { + "file_extension": ".sce", + "help_links": [ + { + "text": "MetaKernel Magics", + "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md" + } + ], + "mimetype": "text/x-octave", + "name": "scilab", + "version": "0.7.1" + } + }, + "nbformat": 4, + "nbformat_minor": 0 +} -- cgit