All Questions
27
questions
1
vote
0
answers
51
views
What is the connection between Ray (Geometric) optics and Electromagnetic theory optics in fiber optics?
I am currently reading about fiber optics and wave propagation in fiber optics and encountered the following part of Gerd Keiser's Book :
according to the diagram shown, its a general case when the ...
11
votes
2
answers
2k
views
How does an endoscope form the image?
I am trying to do ray tracing for an endoscope, but I don't see how it could form a sharp image that could be viewed at the eyepiece.
In the diagram the box in the middle is the "fiber", but ...
- 313
4
votes
3
answers
244
views
Can a fibre preserve the shape of the light being transported through it?
Can some fibres retain the shape of the light being transported through them?
If I emit radiation towards a sample (in the shape of an "S") and this is reflected back into a fibre, will the ...
- 753
0
votes
2
answers
164
views
How can I collimate a laser beam of 100 wavelengths in vacuum?
Before collimating, the beam will have diverged a bit to a radius of 5cm, the range of the wavelengths is 1400-1600nm and I don't want to lose more than 30% of initial power.
I'm asking in general how ...
- 1
1
vote
0
answers
30
views
Ray Power Equation for Bent Fiber Optics
I came across this equation while reading the book, Optical Waveguide Theory (by Snyder and Love) on page 182:
where P(0) is the initial power from the straight fiber, R is the curvature radius, ρ is ...
- 41
1
vote
2
answers
91
views
Why the optic axis of an crystal should has a proper direction; why it cannot be a single line? [closed]
In many books it is written that the optic axis of a crystal is a direction rather than a single line! I really cannot understand what is the necessity of the direction and why I cannot say that it ...
2
votes
1
answer
380
views
Collimation issue with an DIY echelle spectrograph
I am trying to make an educational echelle spectrograph using easily available materials, basically in a cardboard box. An echelle grating (36 lines/mm) needs another prism to do a cross dispersion ...
- 317
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 ...
0
votes
1
answer
631
views
Confinement factor for an optical fiber
I was reading the chapter about optical fibers of "Fiber - optic communication systems" and I have read this statement:
The fraction of the power contained in the core is given by the
...
- 1,319
1
vote
3
answers
286
views
How do you combine two spatial modes of light into one spatial mode in optics?
Is there a lossless way to combine light coming from two different single photon sources into one spatial mode? Either free space of fiber would be fine.
Let's assume the wavelength and polarization ...
- 362
1
vote
0
answers
276
views
Etendue of the eye
I am tasked with calculating the Etendue of an eye with the given values:
diameter of the pupil = 4 mm
diameter of the retina (the active area) = 6 mm
distance from the lens to the retina (b) = 20 ...
1
vote
0
answers
81
views
Practical realization of a optical system for a laser
I'm doing a pre-diploma thesis on how to build a laser system for the treatment of carbon nanotubes at my university. I'm relatively far into the whole project, we've already acquired a laser system (...
0
votes
2
answers
177
views
Gaussian Beam propogation in a fiber
If we suppose that a Gaussian beam traveles in the fiber with diagonal end as it shown in the image, so I have several questions:
1- Do we get in the end of the fiber Evanescent field (Total ...
- 39
0
votes
0
answers
34
views
How Gaussain beam exaclty be after diffraction between two mediums?
How it will be the refraction of the Gaussian beam, does one of its sides will go in distortion, and which equations can predict this distortion?
Sure I have to use Snell's law to know the angle but ...
- 39
0
votes
2
answers
240
views
A single-mode optical fiber with a large core
I know that the core of a single-mode optical fiber is small (approximately 8 μm), because the core diameter is small, the light is propagated in one mode.
And I accidentally read this article which ...