Light Amplification by Stimulated Emission of Radiation By: James Vanderburg & J.P. Brown.

Slides:

Advertisements

Similar presentations

Laser Communication PRESENTED BY, TRISHA PAUL TRISHA PAUL Dept. ECE(8th sem) Dept. ECE(8th sem) Roll No Roll No Reg. No

Advertisements

1.5 Types of lasers Lasers may be classified according to several criteria: Whether the gain medium is a gas, liquid, or solid Fixed frequency or tuneable.

Spectrophotometer Light Sources: Lasers. L.A.S.E.R. Acronym for: light amplification by stimulated emission of radiation Basic principle of lasing: population.

Light Amplification by Stimulated

How Lasers Work. Lasers show up in an amazing range of products and technologies. You will find them in everything from CD players to dental drills to.

Laser (Light Amplification by Stimulated Emission of Radiation)

LASER APPLICATIONS TO MEDICINE AND Prof. Dr. Moustafa. M. Mohamed Vice Dean Faculty of Allied Medical Science Pharos University Alexandria Dr. Yasser khedr.

Prof.Dr.Gehan Mosaad. Define laser and know its physical properties Discuss the mechanism of LASER production Identify different classification of LASER.

BASICS OF LASERS AND LASER LIGHT

Lasers. Spontaneous Emission  Atomic electrons can be excited by external radiation. EM wavesEM waves Electrons in a fieldElectrons in a field  Atoms.

Foundations of Physical Science Workshop: The Atom.

A Novel Approach AAKASH GUPTA UE5501 B.E. (E.C.E.) 8 TH SEMESTER.

An Introduction. The first step on the road to laser was the publication of paper by Albert Einstein in 1916 –describing how atoms could interact with.

Chemistry is in the electrons Electronic structure – how the electrons are arranged inside the atom Two parameters: –Energy –Position.

Electrons and the Electromagnetic Spectrum Table Team Review — DEFINE in your own words ‘Electromagnetic radiation’. LIST three examples.

1LASER is a short form of a) Light amplification by stimulated absorption radiation b) Light amplification by stimulated emission of radiation c) Light.

4-Level Laser Scheme nn  m  →  n  excitation  n  →  m  radiative decay slow  k  →  l  fast(ish)  l  →  m  fast to maintain population.

Section 4-1 Continued.  Ground State – the lowest energy state of an atom  Excited State – a state in which an atom has a higher energy than in its.

AtomsSection 3 Modern Models of the Atom 〉 What is the modern model of the atom? 〉 In the modern atomic model, electrons can be found only in certain energy.

SHRI DADAJI INSTITUTE OF TECHNOLOGY & SCIENCE A SEMINAR ON LASER COMMUNICATION PRESENTED BY: HITESH SILARPURIYA E.C. FOURTH SEM.

Major Concepts of Physics PHY 102 – Lecture #  Syracuse University Lecture #19 How does a laser work? April 6 th Spring 2016 Prof. Liviu Movileanu.

 LIGHT  AMPLIFICATION BY  STIMULATED  EMISSION OF  RADIATION.

Many-electron atoms CHAPTER 8 Many-electron atoms What distinguished Mendeleev was not only genius, but a passion for the elements. They became his personal.

Overview of First Presentation Laser Types of Laser Quantum DL Basic Components of QDL Types of QDL Theory of QDL Application.

Laserlaser. Laser printer Laser pointer Laser: everywhere in your life.

5.3 Physics and the Quantum Mechanical Model. Light By 1900 enough experimental evidence to convince scientists that light consists of waves.

Alpha, Beta, Gamma Radiation

Many-electron atoms CHAPTER 8 Many-electron atoms Dimitri Mendeleev Homework due Wednesday Oct. 29th: Chapter 7: 18, 20, 24, 25 Chapter 8: 1, 2, 4, 8,

PRESENTED BY: AMANDEEP SINGH B.Sc 2(NON-MED) ROLL NO. 1042

CHAPTER 8 Many-electron atoms

All Need to Know About Atoms

The Atomic Theory The smallest particle of an element that can enter into chemical change. 2. Building block of all matter. 3. Consists of a central nucleus.

Atomic Structure.

Aim: How to distinguish electrons in the excited state

Light Amplification by Stimulated

Properties of Laser There are Severel Properties Of LASER which are defined as follows:- MONOCHROMATICITY COHERENCE DIRECTIONALITY BRIGHTNESS DIVERGENCE.

Rutherford Model Know where the protons and neutrons are, but where are the electrons? If opposite charges attract, why do the electrons not fall into.

Light Amplification by Stimulated Emission of Radiation

MEDICAL LASER SYSTEMS Assist Prof. Dr. Lutfi Ghulam Awazli

MODERN ELECTRONIC THEORY OF ATOMS

Ch. 4-1 Models of the Atom Atomic Structure.

Origin of The Electromagnetic (EM) Waves

Bell Ringer What is the smallest part of a living thing (You learned this last year)?

5.3 Physics and the Quantum Mechanical Model

Laser Light overview.

The Structure of the Atom

Chapter 5 Electrons in Atoms.

5.3 Properties and Phases of Matter

Cutnell/Johnson Physics 7th edition

والصلاة والسلام على سيدنا ونبينا محمد صل الله (الليزر) فكرة عمل الليزر

Nature of light and atomic spectrum

Energy and Electrons energy

Earth Chemistry.

Atomic Theory SC.8.P.8.1: Explore the scientific theory of atoms (also known as atomic theory) by using models to explain in the motion of particles in.

Unit 1 Vocabulary Atom – smallest particle of an element that maintains the properties of that element Atomic mass – average mass of one atom of an element.

Lasers. You know magic and stuff

Interaction of Radiation with Matter

Bohr, Emissions, and Spectra

Atomic Theory – Bohr & Chadwick

Unit 2 Particles and Waves Spectra

Atomic Structure.

Atomic Structure Nucleus Protons Neutrons Electrons.

Three kinds of particle emission

Earth, Sun Chemistry.

Aim: How are an atom’s electrons configured?

Matter and Particles of Light: Quantum Theory

Presentation transcript:

Light Amplification by Stimulated Emission of Radiation By: James Vanderburg & J.P. Brown

An atom is the smallest component of an element, having the same properties as that element, consisting of a nucleus and electrons. A nucleus contains neutrons and protons, and at least one electron which is bound to the nucleus by electromagnetic force.

An electron is a subatomic particle that has a negative charge. The electrons have a wave-like behavior when bound to the nucleus which is all part of the atomic orbital. Electrons can exist at different energy levels. Electrons can fall from a higher energy level to a lower energy level. This process emits light because of the energy reduction within the orbital.

Population inversion occurs when a system exists in state with more members in an excited state than a lower state. This is important for lasers because it is necessary for a standard laser to work. The laser needs more atoms in an excited state than a lower energy state. A laser needs continuous electrons transitioning to a lower energy state to function. The transitioning allows the light to be emitted.

The light that is emitted from the laser is monochromatic and coherent. Monochromatic means that it contains one specific wavelength of light. Coherent means that the light moves in step with the others. The light launches in unison unlike a flashlight, which releases light in many directions and the light cannot be pinpointed.

Solid-State Lasers: has lasing material distributed in a solid matrix, such as a ruby or neodymium: yttrium-aluminum garnet “Yag” laser. The neodymium-Yag laser emits infrared light. Gas Lasers: helium and helium-neon are the most common and output a visible red light. These lasers are usually used for cutting hard material. Excimer Lasers: uses a variety of reactive gases that when electrically stimulated, a pseudo molecule (dimer) is produced. When lased, the dimer makes ultraviolet light. Dye Lasers: use organic dyes in liquid or suspension and are tunable over a broad range of wavelengths. Semiconductor Lasers (Diode Lasers): not solid-state lasers, and are usually very small and low powered. May be used in larger arrays, such as laser printers or CD players.

"coherent." Collins English Dictionary - Complete & Unabridged 10th Edition. HarperCollins Publishers. 03 Aug "coherent." Collins English Dictionary - Complete & Unabridged 10th Edition. HarperCollins Publishers. 03 Aug Paul, D.J. "Population Inversion." University of Cambridge. N.p., Web. 3 Aug