Recent content by DariusP

But why does it start to suddenly absorb in deep UV? Any explanation for the edge and why different materials have different absorption edges?

I wanted to ask - why do some materials with very high transmittance inevitably start to absorb in deep UV? Is there an explanation?

Love you, thank you very much

I was reading about this https://en.wikipedia.org/wiki/Nitrogen_laser and it says "80 to 100 eV per Torr*cm pressure of nitrogen gas". I'm finding this a little bit confusing. It needs some specific amount of energy in a centimeter of volume with 1 Torr of pressure?

You know, that is a pretty terrible answer... "it shrinks because it shrinks". It tells me nothing. No physics, no biology there. Did that explanation really satisfy you? I want to know exactly what the light is doing. I want to know what the photons are doing, how they are interacting and...

So I've read that varicose veins can be treated using fibre lasers. First, anesthetics are used locally to numb the limb and also act as an insulator for heat. Then, a small cut is made and a fiber is guided to the vein. Using laser light somehow the vein shrinks. This is what I don't...

Is my thinking correct that higher modulation frequencies can give better resolution but lower maximum distance and vice-versa (lower modulation frequencies can give lower resolution but higher maximum distance)?

I've read that there are laser rangefinders who measure the distance not only by ToF (time-of-flight) method but also by phase-shift. I think I can understand that. Depending how much the phase of the input pulse shifts from the output pulse we can translate it into how much distance the pulse...

Hello, I've known about average laser rangefinders that we can use for domestic needs. They're relatively cheap and can measure up to 50 meters but that's about it. However, I've read that military laser rangefinders are able to measure distances using light up to 20 kilometers. How is that...

I don't know what's up with these useless replies... not the first time too. Maybe people here are already stuck in post count addiction? Anyway - if anyone will ever come around this thread, feel free to visit this link I found: http://www.ti.com/lit/ug/sbau305a/sbau305a.pdf I'm sure you'll...

Ok, I will ask a simpler question then: does anyone know what parts constitute a laser distance meter/rangefinder? I can probably try and deduce how each part works by myself.

Summary: Laser rangefinder (distance meter) working principle Hello, could anyone explain to me (or direct to) how a laser rangefinder/distance meter works? I want to learn about it in as much detail as possible. All I could find so far were very premature explanations telling me that a laser...

I know that a plane wave going through a slit becomes a spherical wave because of a Huygens-Fresnel principle. Can someone explain to me why a plane wave splits into many plane waves with different directions when going through a plate with varying thickness? Can someone explain me this image?

Also, could I get an explanation as to why when we introduce a dopant (Neodymium (Nd) for example) to a material (Yttrium aluminium garnet (YAG) for example) then the energy levels "widen"? I know I've read this but I'm not sure if I understand it.

Why laser output power decreases with increasing temperature? By increasing temperature, I mean increasing temperature of the active medium. I think that thermal lensing alone should not have effect on output power? Just different focusing (focal length). What happens with energy levels in...