All Questions
5
questions
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0
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72
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Speckles max intensity paradox
Wikipedia says (link) that in the limit of many interfering waves the distribution of intensities (which go as the square of the vector's length) becomes exponential
$${\textstyle P(I)={\frac {1}{\...
- 11
1
vote
2
answers
184
views
Why do thermal currents affect light but wind does not?
I notice if I put heat under a laser beam it will cause the beam to shimmer. The heated air is causing a disturbance in the air which affects the light. Yet, I can blast a stream of air from a ...
- 4,711
2
votes
1
answer
57
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How does yag Laser is LASIK work? And what is its lowest precision (till now)?
I am in a undergrad Vison Science class where the professor recently talked about LASIK surgery. In the surgery, a special type of laser that could heat up a specific point (a sphere actually) and ...
- 139
1
vote
2
answers
191
views
Max temperature that can be obtained from radiation source when nonlinear interaction with matter is important?
Using a black body radiation as furnace it is usually said that the max achievable $T$ is limited to the T of the source. So a source of 3000K can not be used to heat a body above 3000K.
A long ...
8
votes
1
answer
8k
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Why are lasers inefficient?
Why are lasers inefficient? Is it because of the heat lost during lasing? Why couldn't there be thermocouples or turbines in parts of the cooling circuits to extract something out of that heat?
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