Two-level lasers are theoretically possible but not practical because it’s nearly impossible to achieve and maintain population inversion between just two levels. Particles quickly decay back to the ground state, so most real lasers use three or four energy levels to sustain lasing.
Sir In Meta stable state ,how a photon excited to atom for come to ground state, If the atom is excited then may be it again go to higher state due excited
It's like some e- loose their energy i.e spontaneous emission......and some e- are interacted with photons and stimulated emission occur and we'll see laser......(This is what I understood)
In a three-level laser, spontaneous emission occurs when electrons in the excited state (level 3) decay to a metastable state (level 2). This metastable state allows electrons to accumulate, creating population inversion. Then, stimulated emission from this state generates the laser output as electrons drop to the ground state.
Two level laser is possible practically but it ain’t efficient.Basically achieving population inversion in two level is difficult as there is only ground state and excited state meta stable state is only for milliseconds so it requires strong pumping to achieve population inversion .So it can be done but is very costly and inefficient.It is like opposing the flow of water in a waterfall
Two-level lasers are theoretically possible but not practical because it’s nearly impossible to achieve and maintain population inversion between just two levels. Particles quickly decay back to the ground state, so most real lasers use three or four energy levels to sustain lasing.
Two-level lasers are theoretically possible but practically unfeasible. Achieving and maintaining population inversion with just two levels is nearly impossible because particles quickly return to the ground state. Most practical lasers use three or four energy levels to sustain lasing action. @@ticx5094
Way of teaching, graphics, sound quality everything is great.. keep it up ✨
Bro apka contact bahut acha hai
You have potential to achieve subscriber in millions
Excellaent content point wise acha tha ❤
you are briliant lecturer keep it up
thanks for giving accurate information about population inversion
Mst pdhate ho Bhai ❤
Bhai stimulated emission aur spontaneous emission mein confused lag rha ho ap
Good Content and good explanation
Thanks for your response!! 😊
Your explanation in this way is good bro
Thanks for visit!
Excellent. Best lecture of laser
Excellent explanation
Keep it up bro
Way of teaching brilliant ❤😊
Glad you liked it! 😊
Bhai photon milne par electron higher state mai jaata but tum kah rahe ho lower state hai aayega
Way of teaching is very nice, thank you sir ❤.
It's my pleasure!
beautifully explained also not in a clumsy video
Maja aaya bhai❤❤❤
Great video
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Nicr sir g very clearly❤❤❤❤❤❤
DHANYAWAD MERI JAAN
Super way of teaching
Very nice
Two-level lasers are theoretically possible but not practical because it’s nearly impossible to achieve and maintain population inversion between just two levels. Particles quickly decay back to the ground state, so most real lasers use three or four energy levels to sustain lasing.
Sir. Population inversion significance in 3 level energy system is how different from 5 level energy systems?
2 level Excimer gas lasers. 3 level ruby laser, 4 level neodymium lasers. ❤
Bohoti acha video hai
Super
Thanks sir.
Much informative
Thank u Sir
Your voice is sweet
Keep singing
can i get these slides ??
Thank sir
Sir In Meta stable state ,how a photon excited to atom for come to ground state,
If the atom is excited then may be it again go to higher state due excited
It is because the energy given to metastable state photons are not sufficient, that's why photons are moving toward ground state.
Sir hm ap k yahi notes bna sakhta hai
Sir two and three level system for laser pumping scheme and two and three level system for population inversion are same?
yes
No, two-level and three-level pumping schemes are not the same as two-level and three-level systems for achieving population inversion.
@@ShrabantiDebno
Nice
❤❤
🤩🤩
Please give English subtitles for those who cannot understand Hindi
To hindi music kaise hit krte hai....wo bhi kya English subtitles ke saath sunte ho😂
👍
I dont understand spontaneous emmission in three level
It's like some e- loose their energy i.e spontaneous emission......and some e- are interacted with photons and stimulated emission occur and we'll see laser......(This is what I understood)
In a three-level laser, spontaneous emission occurs when electrons in the excited state (level 3) decay to a metastable state (level 2). This metastable state allows electrons to accumulate, creating population inversion. Then, stimulated emission from this state generates the laser output as electrons drop to the ground state.
2 level laser possible nahi hai fir aapne kyun banaya hai??
Two level laser is possible practically but it ain’t efficient.Basically achieving population inversion in two level is difficult as there is only ground state and excited state meta stable state is only for milliseconds so it requires strong pumping to achieve population inversion .So it can be done but is very costly and inefficient.It is like opposing the flow of water in a waterfall
Who told you that? Two levels are not a laser system ... ... 😂
Two-level lasers are theoretically possible but not practical because it’s nearly impossible to achieve and maintain population inversion between just two levels. Particles quickly decay back to the ground state, so most real lasers use three or four energy levels to sustain lasing.
Two-level lasers are theoretically possible but practically unfeasible. Achieving and maintaining population inversion with just two levels is nearly impossible because particles quickly return to the ground state. Most practical lasers use three or four energy levels to sustain lasing action.
@@ticx5094