CARBON DIOXIDE LASER
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
seminar class
Active In SP
**

Posts: 5,361
Joined: Feb 2011
#1
21-02-2011, 04:01 PM


presented by:
Bibi Mohanan


.ppt   CARBON DIOXIDE.ppt (Size: 243 KB / Downloads: 173)
CARBON DIOXIDE LASER
A test target is vaporized and bursts into flame upon irradiation by a high power continuous wave carbon dioxide laser emitting tens of kilowatts of infrared light
Introduction
 Operates in middlle infrared region(10.6 μm &9.4 μm )
 Operates on rotational –vibrational transitions
 Both cw & pulsed laser output
 Cw power greater than 100kw
 Pulsed energies of 10 kJ
 Physical arrangement :a gas filled tube between a pair of mirrors excited by a DC or RF electrical discharge.
 Additional gases are added to the gas mixture (besides CO2) to improve efficiency and extend lifetime. The typical gas fill is: 9.5% CO2, 13.5% N2, and 77% He
Excitation Mechanism
 Rotational- vibrational transitions
Laser Types
 Longitudinally Excited Lasers
 Waveguide Lasers
 Transversely Excited Lasers
 Gas Dynamic Lasers
Longitudinally Excited Lasers
Schematic setup of a sealed-tube carbon dioxide laser.
The gas tube has Brewster windows and is water-cooled
Longitudinally Excited Lasers
 Long ,narrow,cylindrically shaped glass enclosures with electrodes at opposite ends from which the discharge excitation current is introduced
 Either pulsed or cw
 Lengths up to several meters
 Two versions
 Water coolant jacket is provided
Waveguide Laser
 Two transverse RF electrodes separated by insulating sections that form the bore region
 RF power supply is connected to the electrodes
 Lateral dimensions of the bore –few millimeters
 Small bore hence, high pressure operation and rapid heat removal
 Hence, high gain and high power output
 Cw powers up to 100 W
Commercial air cooled waveguide laser
 RF excitation : 80-100 MHz
 Four mirrors (two as end mirrors and two for reversing the direction of the beam)
 Pressure : 80 Torr
 Nitrogen:CO2:Helium =3:1:1
 Length :30 cm
 Cw power:35 W
 Wavelength:10.55μm -10.63 μm
Transversely Excited Lasers
 Operates at high gas pressure (1 atm or more)
 High voltages are required to ionize the gas
 Two electrodes are placed parallel to each other separated by few centimeters
 High voltages applied across the electrodes
 Pre-ionization is used
Reply

Important Note..!

If you are not satisfied with above reply ,..Please

ASK HERE

So that we will collect data for you and will made reply to the request....OR try below "QUICK REPLY" box to add a reply to this page

Quick Reply
Message
Type your reply to this message here.


Image Verification
Please enter the text contained within the image into the text box below it. This process is used to prevent automated spam bots.
Image Verification
(case insensitive)

Possibly Related Threads...
Thread Author Replies Views Last Post
  Computer based approach to LASER GUIDED MISSILE SYSTEMS ppt study tips 0 643 07-09-2013, 04:56 PM
Last Post: study tips
  Study of Laser Cooling study tips 0 380 10-08-2013, 12:48 PM
Last Post: study tips
  Axial Compressive Behavior Of a Stitched Carbon Fabric Reinforced Epoxy Matrix Report study tips 0 850 03-08-2013, 02:00 PM
Last Post: study tips
  Laser Surfacing pdf study tips 0 347 02-03-2013, 10:42 AM
Last Post: study tips
  Laser Drilling in Oil Rigs project girl 0 537 30-01-2013, 04:35 PM
Last Post: project girl
  LASER-GUIDED MISSILES REPORT project girl 0 538 02-01-2013, 03:40 PM
Last Post: project girl
  Laser Guided Missile seminar tips 0 443 02-01-2013, 02:52 PM
Last Post: seminar tips
  Electron Beam and Laser Beam Machining pdf project girl 0 479 02-01-2013, 11:09 AM
Last Post: project girl
  ANALYSIS OF THE HEAT AFFECTED ZONE IN CO2 LASER CUTTING OF STAINLESS STEEL pdf project girl 0 408 28-12-2012, 06:07 PM
Last Post: project girl
  Review on Heat Affected Zone (HAZ) in Laser Machining pdf project girl 0 359 28-12-2012, 06:07 PM
Last Post: project girl