8th International Conference on Soft Computing, Mathematics and Control (SMC ...
HE NE LASER PRESENTATION
1. NAME – BIJOY DEY
STUDENT CODE – BWU/BTA/21/117
DEPARTMENT – CSE (AI & ML)
SECTION – B
SUBJECT - PHYSICS
TOPIC – HE NE LASER
UNIVERSITY – BRAINWARE UNIVERSITY
2. INTRODUCTION
A Helium-Neon laser, usually called a He-Ne laser, is a type of
small gas laser . He-Ne lasers have many industrial and
scientific uses , and are often used in laboratory
demonstrations of optics.
He-Ne laser is a four-level laser.
Its usual operation wavelength is 632.8 nm, in the red portion
of the visible spectrum.
It operates in continuous working(CW) mode.
The Helium-Neon laser was the first continuous laser.
3. CONSTRUCTION OF HE NE LASER
Long discharge tube. Length 50 cm and diameter 1cm.
Mixture of He & Ne in 10:1 .
Left side is fully silvered mirror and right side is partially silvered mirror.
It also contains radio-frequency generator.
4. WORKING OF HE NE LASER
In He-Ne laser, we use high voltage D.C as the pump-source. A high voltage D.C
produces energetic electrons, that travels through the gas mixture.
The energetic electrons collide with and excite the He and Ne atoms to metastable
states 20.61 ev and 20.66 ev respectively above their ground states.
The He atom excites the ne atom by collision to its metastable state.
It means He helps in achieving a population inversion in the Ne atoms.
When a excited Ne atom passes spontaneously from the metastable state at 20.66
ev to the state at 18.70 ev , it emits a 6328 Angstrom photon.
This photon moves back and forth between two reflecting ends of the tube and
stimulates all the excited atoms.
Finally , we get a laser beam .
6. APPLICATIONS OF HE NE LASER
The Narrow red beam of He-Ne laser is used in supermarkets to
read bar codes.
The He-Ne Laser is used in Holography in producing the 3D
images of objects.
He-Ne lasers have many industrial and scientific uses, and are
often used in laboratory demonstration of optics.
7. ADVANTAGE OF HELIUM NEON LASER
• HELIUM NEON LESAR EMITS LASER LIGHT IN THE VISIBLE
PORTION OF THE SPECTRUM.
• HIGH STABILITY
• LOW COST
• OPERATES WITHOUT DAMAGE AT HIGHER TEMPERATURES.
8. DISADVANTAGE OF HE NE LASER
LOW EFFICIENCY
LOW GAIN SYSTEM
HELIUM-NEON LASER ARE LIMITED TO LOW POWER TASKS.