Can you make a laser beam from sun light if the sun light is collected to a feed horn from a dish mirror and transported to a laser cavity where a laser beam of a specific color is made? It could be useful in stone carving where electricity generated laser light would make the finished product very expensive.
In this video, the spontaneous emission is explained. Coherent light is created by a laser using a technique called stimulated emission. But in the spontaneous emission, an electron undergoing a transition in an atom will spontaneously emit a photon as light. Spontaneous emission occurs without interacting with other photons, and the direction and phase are random. Because of this, the total power the bunch radiates is only N times that of a single electron. Since this type of spontaneous radiation is statistical, the fields lack a clear phase, and the emission is incoherent.
How can you have three electrons in the same orbit? (As shown in your animation 3:25) That is wrong? Pauli Principle can allow no more than two electrons per orbit.
If an atom is illuminated with an incoming photon with the exact same energy as the transition that would occur spontaneously when in the excited state, the atom may be driven to return to the lower state and simultaneously produce a photon with the same transition energy. When a single photon interacts with an excited atom, it can result in the emission of two photons.
Hi, pls find your query answered - 1. Metastable state has a longer lifetime than the ordinary excited states. Metastable may happen naturally or artificially. For example, a metastable state can be readily obtained in a crystal system containing impurity atoms. 2. Theoretically, every element has a metastable state. In particular, in lasers, we are using xenon or helium because they have very high excitation energy.👍
The electrons present in the atom absorb the energy from its surroundings and move to a higher energy level that is excited state from its ground state. This process is known as absorption. After a particular time period, the electrons losing their energy in the form of photons. When you excite copper atoms, the emission occurs as the electron returns to a lower-energy state. This emission takes the form of visible, green light
If an electron is illuminated with an incoming photon with the exact same energy as the transition that would occur spontaneously when in the excited state, the atom may be driven to return to the lower state and simultaneously produce a photon with the same transition energy. When a single photon interacts with an excited electron, it can result in the emission of two photons. These two photons again interact with other electrons present in the excited state. Thus, more photons are released during the emission process.
No metastable state doesn't exist before the excitation of an electron. Initially, the electron is excited to a short-lived high-energy state, which then spontaneously descends to a slightly lower-energy state, known as a metastable state, with an unusually long life.
A laser medium, also known as a laser-active medium, gain medium, or lasing medium, is the material used to generate laser emission (stimulated emission). The atoms in the laser medium must also be "pumped" into higher energy levels.
I don't know whether i am right or not..but what i think is as follows... let's say the electron is in E1 state.. it'll stay there for a moment so kinda stable...so to make it emit photons, we provide it with more photons which makes him, as you say, go to another excited state E2 which is definitely of higher energy. As we know, higher the energy, lesser the stability so it becomes unstable and instantly jumps back emitting photons. I don't know whether it's right or not...you better Google it
In this video, we have explained that the electron does not remain in an excited state for long, and it quickly returns to the ground states. When this happens, a photon with the same energy as the difference in the energy level between the excited and ground states is emitted.
In this video, we have explained under the topic, spontaneous emission. In an excited state, an electron can release energy and 'fall' to a lower state. When this happens, the electron emits a photon of electromagnetic energy. When an electron returns to its ground state, it can no longer emit energy but can absorb quanta of energy and progress to excitation states.
I think energy difference is in quanta.so according to the energy eq it is directly proportional to frequency.for those frequencies which are very less in visible region is not but red.so i think almost all lasers emit red colour.
A stable subatomic particle with a negative electrical charge is known as an electron. Electrons, unlike protons and neutrons, are not made up of even smaller components. When compared to a neutron or proton mass, each electron carries one unit of negative charge (1.602 x 10-19 coulomb) and has a very little mass.
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awesome very nice and point to point video
O my god. you're great yar unbelievable you're Technic to explain is superb
In a short time , a very nice explanation
In 3 minutes i explained everything must go there
@@unschoolacademy where
Can you make a laser beam from sun light if the sun light is collected to a feed horn from a dish mirror and transported to a laser cavity where a laser beam of a specific color is made? It could be useful in stone carving where electricity generated laser light would make the finished product very expensive.
dude ..are you from the big bang theory
Great animation 👍 very nice expletion thank you very very much
Sir if light has any correlation in phase then they are coherent na sir ?but u explained to be incoherent while explaining
spontaneous emission
In this video, the spontaneous emission is explained.
Coherent light is created by a laser using a technique called stimulated emission. But in the spontaneous emission, an electron undergoing a transition in an atom will spontaneously emit a photon as light.
Spontaneous emission occurs without interacting with other photons, and the direction and phase are random.
Because of this, the total power the bunch radiates is only N times that of a single electron. Since this type of spontaneous radiation is statistical, the fields lack a clear phase, and the emission is incoherent.
Super sir 👏👏👏👏 and thank you very much sir
Glad it helped !!!
thank you for keeping this kind of video that clears my doubts
What is the sequence of these lectures for laser?
Introduction to Lasers
Einstein’s Coefficients
Ruby Lasers
Semiconductor Lasers
Helium-Neon Lasers
Applications of Lasers
very helpful saving my life 😴exam
Full of Knowledge in easy way😍
Thanks ❣️
How can you have three electrons in the same orbit? (As shown in your animation 3:25) That is wrong? Pauli Principle can allow no more than two electrons per orbit.
Pls, share your email id we will have the details sent to you.
Great video really loved it....😇
Great introduction, thanks for sharing :)
Sirr.. your way of teaching..is amazing 👏👏👏👏
this is a very beautiful explanation, thanks you
Thank you for your feedback!
I don’t get it, how does the electron emit two photons of the same energy when it didn’t absorb the energy of the second photon?
one photonic energy is relased by electron and other is by system to fastern the process
If an atom is illuminated with an incoming photon with the exact same energy as the transition that would occur spontaneously when in the excited state, the atom may be driven to return to the lower state and simultaneously produce a photon with the same transition energy. When a single photon interacts with an excited atom, it can result in the emission of two photons.
Nice explanation sir 👏👌
Unique explain sir Thank you sir
very helpful thanks
glad it helped...
Very helpful .... 🙂🙂
Great explanation
What are the conditions to achieve meta stable states in an atom ? Why not all atoms have meta stable states ?
Hi, Kindly do share your contact details at support@m-tutor.com for us to get back!
Hi, pls find your query answered -
1. Metastable state has a longer lifetime than the ordinary excited states.
Metastable may happen naturally or artificially. For example, a metastable state can be readily obtained in a crystal system containing impurity atoms.
2. Theoretically, every element has a metastable state. In particular, in lasers, we are using xenon or helium because they have very high excitation energy.👍
atoms or electrons?
I OBSERVED THE SAME....✌
Basically electrons as they are inside the atoms to generalize we use atoms
Yeah rightly spotted
Its the same
When the electron is excited that means the atom itself is excited
They are atoms
Great introduction
THQ soo much....💞🌌
How does a light can be emitted
When electrons move from ground state to excited state and vice versa
as energy gets released in the form of light
The electrons present in the atom absorb the energy from its surroundings and move to a higher energy level that is excited state from its ground state. This process is known as absorption. After a particular time period, the electrons losing their energy in the form of photons. When you excite copper atoms, the emission occurs as the electron returns to a lower-energy state. This emission takes the form of visible, green light
You are lesson is too good
Perfect vedio
Thank you sir👍
Most welcome
How can more photons released during emissions than absorption
With the electron count constant?
ua-cam.com/video/i0aA0fFTk9c/v-deo.html
👍
If an electron is illuminated with an incoming photon with the exact same energy as the transition that would occur spontaneously when in the excited state, the atom may be driven to return to the lower state and simultaneously produce a photon with the same transition energy. When a single photon interacts with an excited electron, it can result in the emission of two photons. These two photons again interact with other electrons present in the excited state. Thus, more photons are released during the emission process.
Can metastable state exist before excitation of electron
No it is developed due to population inversion.
No metastable state doesn't exist before the excitation of an electron.
Initially, the electron is excited to a short-lived high-energy state, which then spontaneously descends to a slightly lower-energy state, known as a metastable state, with an unusually long life.
It really helped me sir😊
What is meant by the laser medium
ua-cam.com/video/i0aA0fFTk9c/v-deo.html
👍
@@Dxd-A I didn't got it after seeing that video also
A laser medium, also known as a laser-active medium, gain medium, or lasing medium, is the material used to generate laser emission (stimulated emission). The atoms in the laser medium must also be "pumped" into higher energy levels.
During stimulated emission, how E1 electron comes to E0 state. It would have gone further to E2 state when it gets additional energy. Pls explain me.
I don't know whether i am right or not..but what i think is as follows... let's say the electron is in E1 state.. it'll stay there for a moment so kinda stable...so to make it emit photons, we provide it with more photons which makes him, as you say, go to another excited state E2 which is definitely of higher energy. As we know, higher the energy, lesser the stability so it becomes unstable and instantly jumps back emitting photons. I don't know whether it's right or not...you better Google it
@@brokenbauccner3945 Thank you...
In this video, we have explained that the electron does not remain in an excited state for long, and it quickly returns to the ground states. When this happens, a photon with the same energy as the difference in the energy level between the excited and ground states is emitted.
very nice video
Wat is difference between optics and lasers
Optics is a medium, and the laser is a source, which is used in optics
Nice lecturr
Do you have a written explanation on this topic?
But why don't the excited electrons absorb the photons and move to a higher level instead of getting down to the ground state ?
Cos thats how it is. If an electron is hit by a photon of similar wavelength it continues to emit energy and gets amplified to the higher state
In this video, we have explained under the topic, spontaneous emission. In an excited state, an electron can release energy and 'fall' to a lower state. When this happens, the electron emits a photon of electromagnetic energy. When an electron returns to its ground state, it can no longer emit energy but can absorb quanta of energy and progress to excitation states.
Great sir
Nice video
Thank you ❤️
Thankew😊😊
Awesome video!tysm
Thank you sir
Good explanation
Pls make more videos
nice video
It's not spontaneous absorption it's stimulated absorption
Brilliant
tnq sir
Why almost all lasers with red colour??
I think energy difference is in quanta.so according to the energy eq it is directly proportional to frequency.for those frequencies which are very less in visible region is not but red.so i think almost all lasers emit red colour.
It is most visible color
Red laser pointers are widely used because they are the least expensive to produce. Deep red laser diodes have a wavelength of around 650 nanometers
Nice ball
Endless
Thanks sir
useful
Tq sir
Thank you
Sir pls share the PDFs🙏🏼🙏🏼🙏🏼🙏🏼
those who came to see this video because you have a exam tommorow skip to 1:51 timestamp to avoid the useless crap
🥰👍
Great
Anna interference videos chei
Bachh gay aann.
Whats an electron. I dont believe you july
A stable subatomic particle with a negative electrical charge is known as an electron. Electrons, unlike protons and neutrons, are not made up of even smaller components. When compared to a neutron or proton mass, each electron carries one unit of negative charge (1.602 x 10-19 coulomb) and has a very little mass.
اكو عرب بالطياره 😂😂
Well explanation
nice video
good explanation
Tq Sir
Tq sir