All Questions
Tagged with wavelength laser
24
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
3
answers
104
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What is a laser spectrum?
What is a laser spectrum? How many wavelengths can we see in it, and why?
For a regular laser, the red ones you can buy at the store, is there just one red wavelength in the laser? Or are there ...
- 11
2
votes
1
answer
682
views
Why can't we use polychromatic light for making laser?
As far as I have read in my textbooks, we can only use monochromatic light for making a laser. Why can't we use polychromatic one? What if we try to make a laser out of a polychromatic light?
0
votes
1
answer
68
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Relationship between wavelength and storage
I have a question regarding the working of optical discs. We know that Blu-ray disc stores more data than DVD. There are two reasons for that:
The pits are smaller
The wavelength of blue light is ...
- 41
0
votes
1
answer
89
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Difference-frequency-generated (DFG) spectral width
If we have two laser beams with central wavelengths $\lambda_1$ and $\lambda_2$, (one with a spectral width of $\Delta\lambda_2$ and one with negligible spectral width), interacting in a non-linear ...
- 41
3
votes
1
answer
161
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How to measure the wavelength of a laser? [duplicate]
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 ...
1
vote
1
answer
134
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Must the distance between the reflectors of a coherent laser be a multitude of its intended wavelength?
Must the distance (aka cavity length $L$) between the two reflective mirrors of a spatial and temporal coherent laser be a multitude of the lasers intended wavelength?
If no, why not?
If yes, how does ...
- 282
0
votes
1
answer
133
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If most types of practical lasers produce a large number of half-wavelengths, then how are they practical for use at all?
I am currently studying Laser Systems Engineering by Keith Kasunic. Chapter 1.2.1 Temporal Coherence says the following:
Axial (or longitudinal) modes are determined by the geometrical fit (or ...
- 889
3
votes
1
answer
234
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Does modulating a laser source change its color?
Hopefully you guys can solve this hypothetical for me.
Suppose I have a laser which emits light at frequency $530\mathrm{THz}$ with a very narrow spectral width $1\mathrm{Hz}$.
From signal theory, ...
- 91
1
vote
0
answers
34
views
Wavelength absorbed by cornea but not by air
I'm interested in mounting laser diodes on servos and using them to transmit data. However, I'd rather not accidentally blind someone, even if they (say) stare for five minutes into the beam. My ...
- 327
0
votes
0
answers
35
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Laser Detection Paint
Does there exist a paint which if a pulsed laser of ~1500-1600nm was fired at it it would emit visible light or IR Radation (3-5 micron)?
I have seen up-converting inks and paints but I can't find ...
- 101
0
votes
2
answers
1k
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How does spot size of a laser depend on wavelength?
Does the spot size of a laser depend on wavelength? We have a laser source that is fed into a spectrometer to set the wavelength we want. No other optics are used after the spectrometer. I was going ...
- 21
3
votes
3
answers
1k
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How can a wavelength be defined for a laser where a photon's travel distance over a pulse duration is less than a wavelength?
Femtosecond laser pulse are widely used in experimental physics. Femtosecond lasers like Nd:YAG systems produce coherent light at wavelength 1053nm. The distance traveled by a photon in 1 fs is 300nm; ...
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4
votes
5
answers
2k
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Will overlapping two different beams of coherent light with different wavelength cause interference?
If I use two different wavelength lasers to transmit light into a single mode optic fiber will they interfere with each other? If so, how much will be that interference.
1
vote
2
answers
93
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Multi wavelength lasers
At the lab I work at, we have a laser capable of emitting light at a spectrum of wavelength. As far as I know, this spectrum is continuous, in that it can emit from 800 nm to 1200 nm for example.
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