Questions tagged [laser-interaction]
132 questions
12
votes
1 answer
How can one recover the classical frequency-modulation Bessel sidebands from a quantum emitter in a harmonic well?
Consider an atom that emits at frequency $\omega_0$ that's located at a position $x$ that moves under the influence of a harmonic oscillator at frequency $\nu$. In both classical and quantum physics, the Doppler shift induced by the motion on the…
Emilio Pisanty
- 137,480
10
votes
1 answer
Mechanism causing red fluorescence from green (532nm) laser in household glass
Background / Experiment
I was surprised by this toot by @gigabecquerel, where the author shows red fluorescence in the thick bottom of a (drink) glass when exposed to a cheap consumer-grade green laser pointer laser. They also verified that it's not…
Marcus Müller
- 277
8
votes
3 answers
What causes a simultaneous transition of an electron from a higher orbit to a lower one when exposed to a photon of suitable wavelength?
I know this is the basis of LASER action but why does an electron fall to a lower vacant orbit when exposed to a photon of energy equal to the difference between the initial and final orbit? The concerned incident photon lacks the energy needed to…
ThePhysicist
- 687
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6
votes
2 answers
Opposing Laser Beams Turns One Laser Off
When I send two separate laser beams directly into each other one of the beams goes completely out. These are inexpensive 5mv red diode lasers. What’s happening inside the laser to make it “turn off”? When the beams are not opposing the “turned off”…
Lambda
- 4,753
6
votes
1 answer
The difference between parametric and non-parametric linear and nonlinear optical processes?
There are plenty of linear and nonlinear optical processes, that can be divided into two groups: parametric and non-parametric (link). However, why are they called parametric (non-parametric)? What is the origin for this? Where is the…
Capo Mestre
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5
votes
2 answers
What is "Radiation Friction"?
From this report on generating high intensity magnetic fields (emphasis added)
The Faraday effect has been known for a long time. It refers to the
polarization plane of an electromagnetic wave propagating through a
non-magnetic medium, which is…
user56903
4
votes
1 answer
Are angular momentum selection rules only understood for hydrogen like species?
I am someone with a rudimentary understanding of atomic and molecular physics, and with that I'm trying to understand in which case which selection rule becomes applicable. For the angular momentum selection rules in particular, I see that the…
UVcatastrophe
- 153
4
votes
1 answer
Electromagnetically induced transparency (EIT) and Stimulated Raman adiabatic passage (STIRAP)
What is the connection between Electromagnetically induced transparency (EIT) and Stimulated Raman adiabatic passage (STIRAP) in case of lambda system? can we achieve STIRAP with different shapes of input pulses?
Devender
- 41
4
votes
1 answer
BEC interaction with light
I would like to ask when we describe coherent light interacting with atoms, what's the difference in hot atom case and BEC regime?
In hot atom vapor, I know we could start with a simple interaction Hamiltonian with rotating wave…
hcai
- 91
4
votes
1 answer
Laser speckle reduction for integration time of microseconds
How to reduce laser speckle noise for an imaging system that demands integration times of microseconds? I am aware of these two commercial solutions:
Optotune laser speckle reducer. It has a frequency of 300 Hz, so it wouldn't work.
Nanophoton…
4
votes
3 answers
From power of a laser beam to electric field amplitude
In my experiment, I use a laser beam with wavelength $\lambda=894 \text{nm}$ for some magnetic resonance experiment. Right now, I'm doing some calculation using Quantum Mechanics, which requires the amplitude of the electric field to be inserted to…
The Quantum Physicist
- 3,517
3
votes
0 answers
Canceling the remaining time-dependence in a "cyclic" Hamiltonian for which rotating frame transformation (RFT) fails?
Question: Is there a transformation or simple approximation to use to cancel the time-dependence in a Hamiltonian of form
$$
H_{G} = \sum_{(m,n)\in E,\ m
prolyx
- 1,439
3
votes
1 answer
How to measure the wavelength of a laser?
I'm building an enclosure for a laser engraver that emits light at ~455nm. I want to be able to measure the wavelength of the light that is refracting off the item being engraved. I would want to be able to measure an initial control with no…
3
votes
0 answers
Rigorous adiabatic elimination for $N$-state quantum system under harmonic perturbation
I am interested in a rigorous derivation of the coherent evolution of a quantum system with $N$ states under the application of a harmonic perturbation. I have read several articles about the use of adiabatic elimination for this, but none of them…
Quantum
- 427
3
votes
2 answers
What are the losses in a laser cavity?
I studied that to get the lasing conditions gain must overcome the losses. But what are the losses? Thanks a lot
Luigi2405
- 153