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Questions tagged [lasers]

Questions related to lasers, laser-based systems or devices, and their applications.

Laser, which stands for light amplification by stimulated emission of radiation, is a device that typically produces a well-defined narrow beam of light. Usually it is monochromatic, or single-colour, i.e. its radiation encompasses a very narrow spectral range. Lasers can be ultraviolet, visible and infrared, as well as continuous or pulsed.

Most common lasers are based in a semiconductor diode, but there are also gas-, liquid-, fibre- and solid-state lasers.

Lasers are used in a vast variety of applications nowadays, including:

  • telecommunication
  • surgery
  • remote sensing
  • measuring distances
  • data storage
  • entertainment
  • metal welding and cutting
  • research
  • security
  • laser pointers
  • and many more
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Laser diode input/output ratio

I am a photo technician working in photographic labs to repair printing machines. I am trying to better understand how these machines operate. Blue laser gun Laser gun type = 473 $nm$ blue dpss. On label = maximum output 50 $mW$, 473 $nm$, type 3b…
SARDAR TARIQ
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How does a laser printer write with light on the photosensitive drum?

I want to understand how a laser printers laser writes on a photosensitive drum. I am trying to understand this process. the photosensitive cylinder is illuminated by a laser beam that projects above the negative of the image. After you…
user332153
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Tea nitrogen laser debugging

I am making a tea nitrogen laser based off the rimstarorg youtube channel. I have a perfect setup as seen below I use 11, 1kv diodes to convert my 7,500 volt lug on my neon sign transformer to DC. My dielectric, well, i tried everything from…
Reese Houseknecht
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What is the highest repetition rate achieved for pulsed Terawatt and Petawatt-order lasers?

What is the highest repetition rate achieved for pulsed Terawatt and Petawatt-order lasers?
user287933
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How 2 lasers interacting causes a dot of light

Take a loom at this diagram You have probably heard of this before but im just curious what laser they are using to do this. They do t appear to be ionizing air. It seems the one laser is just for color on the particle but what is the other? I…
Reese Houseknecht
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Strange wire on CO2 Laser Tube

Hello all, I just recently purchased a 40W CO2 Laser Tube. I noticed there is a weird stray copper wire coming out from the negative anode that is looped and tied around the lens frame. Can anyone explain what this is and its purpose? Is it safe to…
emtinkerer
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what does it mean to unfold a resonator

A way to find the modes propagating in a resonator of length $L$ is to write the field as $E(x,y,z)e^{i \omega t}$ and calculate $E(x,y,z)$ inside an equivalent periodic lens structure. Then imposing self consistency on the round trip…
SimoBartz
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Best method of bouncing laser off series of mirrors

I'm preparing to add a DIY laser system with the beam bouncing from the module at the top of the stairs and then bouncing off a series of mirrors down the stairs to an LDR. My question is essentially can anyone give me any guidance as to how best…
James Patterson
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Laser efficiency, what is this term?

I'm studying the laser input-output power relation. In particular I'm studying the laser slope efficiency $\eta_s$ ($\eta_s=\frac {dp_{out}} {dp_{in}})$. However, my textbook tells that $\eta_s$ can be divided in 4 factors: $\eta_s=\eta_p \eta_c…
SimoBartz
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Laser saturation and laser saturation intensity

Can someone explain what is laser saturation and laser saturation intensity? I don't find a proper definition and it seems to me similar to steady state intensity.
SimoBartz
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Trapping a particle in a laser beam (optical tweezers)

So upon watching videos and reading articles i understand few things. For one when the laser beam is focused to a tight enough point when placing a material in there (people use crayola markers) it will trap and burn that particle for a little…
Reese Houseknecht
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Why are fine metal filters made of meshes?

Given that we have mechanisms of performing photolithography at 10nm, why are metal filters often meshes? Wouldn't it make a lot more sense to buy a single chunk of metal, and use the UV lasers to poke lots of N micron holes in it?
Sargun Dhillon
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How do "laser planes" work?

There are machines that are used to draw a line with light, for example to show workers a line along which they should cut something. I have also seen an artistic installation where clouds of artificial smoke are illuminated with planes of light,…
Plop
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Laser level device and theory

Does anybody know good book/site explained device types and theory of laser levels? I only find information like marketing or homemade tuning instructions.
Dmitry Perfilyev
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How do I detect laser point?

I know military uses laser designators and they can be visible by their bombs or missiles from really long range. My question is how could I do such laser point tracking device? Lets say I point laser at wall and I want to detect its position.…
Name
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