I gave a class seminar on fiber optics with satendra sangwan.

1. Fiber Optics Laser
Presented by:
Satyendra Rajput
And
Satayender Sangwan
Under the Supervision:
Dr. Shivakiran Bhaktha B.N.
Assistant Professor
Department of Physics
Indian Institute of Technology, Kharagpur

2. Outline:
• Introduction
• Components of Fiber
Laser
• Working principle
• Features of Fiber Laser
• Applications
• Present scenario
• Future prospectus
• References
https://www.orc.soton.ac.uk/how-fibre-lasers-work

3. Introduction:
• Fiber lasers are optically pumped,
commonly with help of diode laser.
• In fiber laser; a diode pump source
can be a single diode or many
separate pump diode, each with a
fiber going into coupler.
• The doped fiber has a cavity mirror
on each end; these are fiber Bragg
gratings, which fabricate within the
fiber.
Laserfocusworld.com/articles/print/volume-48

4. Components of fiber laser:
1. Dual core structure:
• An undoped outer core collect the pump light and
guide it along the fiber.
• Stimulated emission is generated in the fiber
passes through the inner core.
• The inner core doped with (ytterbium or erbium)
that is stimulated to emit radiation by the pump
light.
2. Bragg grating:
• The mirrors reflect the light backwards and
forwards, and on every round trip, more and more
photons are generated.
• The newly-created laser light needs to be let out in
order to be useful, so one of the mirrors doesn't
reflect everything. https://www.fbgs.com/technology/fbg-principle/
Laserfocusworld.com/articles/print/volume-48

5. Working Principle:
• With the help of diode laser, we
push the electrons of the doped
fiber, within the laser cavity; which
has Erbium or Ytterium atoms.
• One of the electrons to drop down
from the meta-stable state and emit
a photon. After that it starts a
cascade.
• Why It start a cascade?
The emitted photon’s are confined
inside the fiber core and cavity.
After that, it bounces between the
Bragg grating and stimulate the
other electrons to emit photons.
https://www.orc.soton.ac.uk/how-fibre-lasers-work

6. Features of the Fiber Laser:
• Fiber Laser is stable than any other laser
• It has the beam quality so high.
• It can be made to go up to very high power. It has been
made with over 1 kW of power. That is more than
enough to cut through an inch of steel.
• They are very efficient to cool.

7. Applications: 1. Material processing
Cutting Drilling Marking & Engraving
Metal welding Polymer Welding Surface cleaning
Image courtesy: IPG Photonics corporation

8. 2. Advanced and Scientific research
Microscopy
And
Holography
Optical Pumping
And
Spectroscopy
Image courtesy: IPG Photonics corporation

9. 3. Medical Procedures
Ophthalmology
And
Surgery
Dentistry
And
Imaging
Image courtesy: IPG Photonics corporation

10. Present Scenario in Industries:
• Automotive/Automobile
• Consumer electronics and appliances
• Nuclear Power
• Heavy Industry and transport
• Aerospace

11. Future Prospectus:
• Aim to get a high quality single beam,
either through coherent combination.
• Aim to get high power single mode
fiber lasers.
• Aim to expand the advanced and
emerging applications of fiber lasers.
• Aim to increase the role of high
power fiber laser in space technology.

12. References:
• https://www.orc.soton.ac.uk/how-fibre-lasers-work
• https://www.laserfocusworld.com/articles/print/volume-
48/issue-04/features/the-state-of-the-art.html
• www.ipgphotonics.com
• https://www.techopedia.com/definition/24912/fiber-laser

13. Thank
You