If "phase" is so important in this lecture, why didn't he explain this concept? Heisenberg Uncertainty Principle: dE . dt = d(h.f) . dt = h . df . dt > h-bar/2 In this video he uses the Full Width at Half Maximum (FWHM) for line width.
No, linewidth occurs for different causes like collision, doppler shifting, natural line width etc, where modes are selected by round trip path travelled by the photon.
If you watched the lecture fully you can see he gave 2 examples of He-Ne laser having cavity lengths 10cm and 30 cm respectively. In 1st scenario one bandwidth only contains 1 mode. But in 2nd case 1 bandwidth contains 3 modes. So there is no relation between them, these are by different reasons.
Given very good explanation which helps the students around the globe. It is really helpful for final exam preparation
Thanks for very good explanation
excellent
If "phase" is so important in this lecture, why didn't he explain this concept?
Heisenberg Uncertainty Principle: dE . dt = d(h.f) . dt = h . df . dt > h-bar/2
In this video he uses the Full Width at Half Maximum (FWHM) for line width.
Does this emission linewidth can be explained by no. of modes, Higher the modes, broader is the linewidth
No, linewidth occurs for different causes like collision, doppler shifting, natural line width etc, where modes are selected by round trip path travelled by the photon.
If you watched the lecture fully you can see he gave 2 examples of He-Ne laser having cavity lengths 10cm and 30 cm respectively. In 1st scenario one bandwidth only contains 1 mode. But in 2nd case 1 bandwidth contains 3 modes. So there is no relation between them, these are by different reasons.
Thank you sir 👌👌
How did you get the formula for coherence time as :(Lc=1/(delta v))?
Please explain in comment sir.
Time = Length / Velocity
When he coughs into the mic my ear goes deaf
Sensitive ear like a 8 year old girl lol
change in frequency of HeNe me kuch to gadbad hai
Confusion created