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작성자포포 조회 205회 작성일 2020-10-28 12:17:55 댓글 0

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Helium Neon laser

LASERFEST 2010: This is a video recording of an educational demonstration that explains basic principle of laser operation using a popular Helium Neon laser.
محمد العراقي : اكو طالب سادس هنا
Lenna Zuriel Guevara Guillen : Alguien lo puede traducir en español por favor
scott meggy : your resistor is burning out
Mohammad Tila : ok so are we going to pretend that there is no exorcism going on in the background .
bendy st41 : hmmm i should it the for my buji
Afaf saad : سبحان الله العظيم وبحمده
Home made science : There is patent of hoverboard where is used this laser and pointed down through 2 coils around the beam end where it makes ion force combination with magnetic field of coils
Bill Kranz : I have several of these type of HeNe laser tubes donated to me and am trying to figure out the cheapest and easiest way to power them via AC 120V current.
I like your explanations here but am confused about the talk where you put a mirror in front of the beam. In that case how does the laser beam get to the wall?
For Bill R's comments below - "build your own power supply..." I have not seen a good step by step video of that process.
I wish the video creator would explain the power source he uses.
Thanks!!
Nate Deezy : put a ruby at the end not a mirror 
Ali Dairy : the kid in the background be scary 

How a Helium-Neon Laser Works


bhavik chaudhary : smoke weed everyday. You will know how it works.
Dimurthedwarf : Nice and simple. Btw what is the name of the song? :)

Construction and Working of Helium – Neon laser

Construction of Helium – Neon laser
A continuous and intense laser beam can be produced with the help of gas lasers. A simplified diagram showing basic features of a Helium – Neon gas laser is shown in the animation. Helium – Neon laser system consists of a quartz discharge tube containing helium and neon in the ratio of 1 : 4 at a total pressure of about 1 mm of Hg. One end of the tube is fitted with a perfectly reflecting mirror and the other end with partially reflecting mirror.

Now carefully observe how a Helium – Neon laser works.

Working of Helium – Neon laser

A powerful radio frequency generator is used to produce a discharge in the gas, so that the helium atoms are excited to a higher energy level. The energy level diagram for He and Ne atoms are shown in the animation. When an electric discharge passes through the gas, the electron in the discharge tube collide with the He and Ne atoms and excite them to metastable states of energy
20.61 electron volts and 20.66 electron volts respectively above the ground state. Some of the excited helium atoms transfer their energy to unexcited Ne atoms by collision. Thus, He atom help in achieving a population inversion in Ne atoms. When an excited Ne atom drops down spontaneously from the metastable state at 20.66 electron volts to lower energy state at 18.70 electron volts, it emits a 6328 Å photon in the visible region.

This photon travelling through the mixture of the gas, is reflected back and forth by the reflector ends, until it stimulates an excited neon atom and causes it to emit a fresh 6328 Å photon in phase with the stimulating photon. This stimulated transition from 20.66 electron volts level to 18.70 electron volts level is the laser transition. The output radiations escape from the partially reflecting mirror.

The neon atoms drop down from the 18.70 electron volts level to lower state E, through spontaneous emission emitting incoherent light. From this level E, the Ne atoms are brought to the ground state through collision with the walls of the tube. Hence the final transition is radiationless.
Debasmita Sahoo : It is wrong concept.
Mighty Scattle : 10:1 or 1:4 ?
Zunaira Khan : he-ne are in the ratio is 9:1
not a 4:1
according to google
akash cm : What is the active element
The Mirage : Everyone in the comment section he -ne ratio is not 4:1 its
5:1
7:1
8:1
10:1

test blog : Another nice explanation at

Ranjita Shaw : informative but boring
Ashish kumar : Get notes for
He-Ne laser construction and working
Link -http://noteschamber.com/related2.php?podmaker=2%20semester%20back%20exam%20(rtu)%20%20%20&%20k=2ndsemback%20%20&%20toa=He-Ne%20laser%20construction%20and%20working
w gyoku : Ratio is wrong
Captain Noober : I think it should be like that, that when discharge is flown or when atom got excited Actually both he and ne got excited and due to collision he give or transfer its energy to ne for stimulated photon emission

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