LASER TECHNOLOGY

OBJECTIVESIntroductionHistoryDefinitionConstructionTypesApplications

1/17

INTRODUCTIONThe term "LASER" originated as an acronym for “Light Amplification by Stimulated Emission of Radiation”.

Fig 1.0

2/17

HISTORY•In 1917, Albert Einstein established the theoretical foundations…

•In 1928, Rudolf W. Ladenburg confirmed the existences of the phenomena of stimulated emission and negative absorption.

•In 1950, Alfred Kastler (Nobel Prize for Physics 1966)..

3/17

Ist LASER

Fig 1.14/17

DEFINITION

“A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation.”

5/17

CONSTRUCTIONA laser consists of:

•Pump Source•Gain medium/Laser medium•Optical Resonator

6/17

CONSTRUCTION

Fig 1.2

7/17

TYPESFollowing are some of types of lasers:Gas Laser.Chemical Laser.Solid-state Laser.Fiber Laser.Semiconductor Laser.Dye Laser.

8/17

GAS LASER“A gas laser is a laser in which an electric current is discharged through a gas to produce coherent light.”

Fig 1.3

9/17

CHEMICAL LASER“Chemical lasers are powered by a chemical reaction permitting a large amount of energy to be released quickly.”

Fig 1.4

10/17

SOLID-STATE LASER“Solid-state lasers use a crystalline or glass rod which is "doped" with ions that provide the required energy states.”

11/17Fig 1.5

FIBER LASER“If the light is guided due to the total internal reflection in a single mode optical fiber, it is called fiber laser.”

Fig 1.6 12/17

SEMICONDUCTOR LASER

“Semiconductor lasers are diodes which are electrically pumped.”

Fig 1.7

13/17

DYE LASER“Dye lasers use an organic dye as the gain medium.”

Fig 1.8 14/17

16/17

ANY QUESTION

NAME: MUHAMMAD FASHEE ZEB.SECTION: C.CLASS NO: 87. DEPARTMENT: ELECTRICAL COMM. PRESENTATION TOPIC: LASER TECHNOLOGY.