All Questions
23
questions
11
votes
4
answers
2k
views
Can the laser light, in principle, take any wavelength in the EM spectrum?
Can the laser light, in principle, take any wavelength in the EM spectrum? I don't think there is what prevent this in principle, right?
- 959
1
vote
1
answer
45
views
Why do we see objects with a given color?
I'm currently studying Electromagnetic Optics, and I don't quite understand the (classical) process through which we perceive an object with a given color. From my understanding, I'd make a ...
- 1,616
1
vote
2
answers
64
views
Under what conditions do waves stay monochromatic?
Based on my intuition, once light is monochromatic it will stay that way unless you actively try to change its frequency. My intuition stems from the intricate optical laser setups in my lab that ...
11
votes
1
answer
847
views
Refractive index of water
The index of refraction is given by the following formula:
$$
n = \sqrt{\frac{\epsilon \mu}{\epsilon_0 \mu_0}} = \sqrt{\epsilon_r \mu_r},$$
where $\epsilon_r$ is the relative permittivity/dielectric ...
- 665
12
votes
7
answers
3k
views
Is it possible to control frequency of the light?
Generating light is the process of energy conversion. I mean is it possible to control the frequency of light by controlling directly the input like heat, current... not by filters or medium ...
- 153
-4
votes
2
answers
278
views
Can the wavelength of light change after it is emitted in a vacuum? [closed]
Can the wavelength of light change after it is emitted in a vacuum?
As the picture below describes, is it possible for light to change wavelengths after being emitted in a vacuum (no medium).
1
vote
2
answers
143
views
Why does increasing radiation frequency produce narrower collimated beams?
In the context of a THz Gaussian beam $(1)$, it is stated:
Terahertz output radiation at higher frequency produced a narrower collimated beam owing
to diffraction effects (...)
What kind of ...
- 753
20
votes
8
answers
5k
views
What does the "true" visible light spectrum look like? [closed]
When I google "visible light spectrum", I get essentially the same image. However, in each of them the "width" of any given color is different.
What does the "true" ...
- 337
0
votes
0
answers
42
views
How does the light and energy breakdown depend on wave frequency? [duplicate]
How does light and light energy "breakdown" (when light is reflected, some light will be transmited, absorbed, or reflected, just like energy associated with light) depend on wave frequency? ...
0
votes
2
answers
60
views
Is there any way to differentiate UV light from visible or IR light?
I'm working on a small sensor system that responds to only UV light and I wanted to know that is there any way to differentiate between UV light and the rest of the spectrum like using lens if so then ...
-1
votes
1
answer
53
views
Confusion on the indice of refraction: is it dependent on the frequency or not? [duplicate]
I saw in my course than when light hit a medium, it makes some dipole oscillating with the same frequency as the one of the light $\omega$. By a classical mechanics reasoning, one can show that the ...
- 183
2
votes
2
answers
49
views
The typical IR spectrometer broadband source emits all IR frequencies of interest simultaneously
I am currently studying the textbook Infrared and Raman Spectroscopy, 2nd edition, by Peter Larkin. In a section entitled Infrared Absorption Process, the author says the following:
The typical IR ...
- 889
5
votes
2
answers
92
views
As with infrared pictures, would it be possible to see 2.4GHz waves as light?
I have seen many pictures of stars that were taken in the UV or IR spectrum. Others have pointed out that they are scaled down so as to map to visible elements within our capabilities. Could Wi-Fi ...
- 51
0
votes
2
answers
189
views
What is considered the frequency (and wavelength) of guided waves in a waveguide?
In a rectangular waveguide with sides of length $a$ and $b$, the dispersion relation is
$$\beta^2 =\omega^2\mu\epsilon=\beta_z^2+\beta_x^2+\beta_y^2=\beta_z^2+\beta_s^2.$$
So we have
$$\beta_z = \...
- 27
3
votes
2
answers
293
views
Impossibility of Monochromatic Light [duplicate]
Pages 24-25 of my textbook, Optics by Hecht, says the following:
Using the above definitions we can write a number of equivalent expressions for the traveling harmonic wave:
$$\psi = A\sin k(x \...
- 889