All Questions
Tagged with optical-materials non-linear-optics
16
questions
6
votes
2
answers
586
views
Could a transparent frequency-altering material be possible?
I would imagine a material that is transparent but a electromagnetic wave going out will have a lower frequency than when going in (and maintaining it's direction). You could build glasses to see UV-...
- 63
0
votes
0
answers
35
views
Second Harmonic Generation on chiral surfaces
I try to recreate a fit in this paper on SHG on chiral surfaces.
I guess the question itself is too specific to get an answer, so I state these questions that are a bit more to the point (and leave my ...
- 535
0
votes
2
answers
156
views
Why do non-linear optical effects occur?
Why do non-linear optical effects occur? Why do the materials respond differently at high intensities and at some resonant frequencies?
- 71
2
votes
0
answers
134
views
What is difference between Electromagnetically induced transparency (EIT) and Coherent population trapping (CPT)?
EIT: Electromagnetically induced transparency
CPT: Coherent population trapping
When two resonant light fields (probe field and strong coupling field) are incident on an opaque material whose atoms ...
- 43
0
votes
0
answers
34
views
Why does non-linearity come into picture only at a large intensity of optical fields?
I have read that for sufficiently large intensities of optical fields (of the order of $10^8$), we can actually observe a non-linear relationship between the polarization and the field, given as
$$\...
- 295
0
votes
1
answer
356
views
How can we generalize the definition a non-linear media?
According to the definition: Nonlinear media are dielectric materials whose polarization density changes nonlinearly if a strong field is applied to them. If the field is small the nonlinear terms ...
- 1,348
2
votes
1
answer
221
views
Nonlinear Optics: SHG and OPO
I am new to nonlinear optics, and recently I started studying about the second harmonic generation (SHG) and the optical parametric oscillation (OPO) where these two nonlinear interactions are ...
- 367
1
vote
0
answers
32
views
Quantum Dot Surface Area to Volume Relationship
Do the properties off quantum dots depend more on their surface area rather than the volume they occupy?
Depending on the case, then would quantum dots of different shapes show different properties?
- 477
1
vote
1
answer
64
views
Is there a nonlinear optical material that absorbs visible light stronger with increasing intensity independent of its wavelength?
One of the main shortcomings of digital image sensors is the quite "unnatural" behaviour for rendering highlights compared to film (and the human eye, I guess). Typically, with increasing ...
- 11
1
vote
3
answers
159
views
Microscopic origin of non-linear optical effect
I know that a non linear optical medium is a medium in which the optical response for example polarisation vector varies as
\begin{equation}
\vec{P}=\epsilon_0\chi^{(1)}\vec{E}+\epsilon_0\chi^{(2)}\...
- 1,348
1
vote
1
answer
20
views
Is it possible to optimally transmit solar radiation by a system of multiple optical fibers?
As we all know, if an optical fiber is designed with the right material and properly bent, light can be transmitted along the fiber with very little attenuation.
Figure 1 shows the interaction of ...
1
vote
0
answers
36
views
Small values and Negative nonlinear susceptibility of a degenerate parametric amplifier
The quantum Hamiltonian of a degenerative parametric amplifier (DPA) is given by (taking $\hbar=1$
$$
\hat{H}=\omega\hat{a}^{\dagger}\hat{a}+2\omega\hat{b}^{\dagger}\hat{b}+\kappa\left(\hat{a}^{\...
0
votes
1
answer
984
views
How to calculate the dispersion parameter of a Fiber?
I am writing a presentation about DCF Fibers. From many articles i am reading, the dispersion parameter of Fibers are given. But it is not shown how it has been calculated.
For example ,in this ...
- 115
0
votes
1
answer
58
views
What is the gain control technique used in optics?
In optics, it is said that The gain bandwidth and gain flatness of Amplifiers are enhanced utilizing gain control techniques.What techniques are they referring to ?
I know the automatic volume ...
- 115
3
votes
0
answers
248
views
optical scattering cross section and polarization tensor
The optical scattering and absorption cross sections are well known to be
$$
C_{sca} = \frac{k^4}{6\pi}|\alpha|^2 \qquad C_{abs} = k\Im (\alpha)
$$
where $k$ is the wavevector and $\alpha$ is the ...
- 143