Laser Definition and 1000 Threads

I'd like to perform experiment on NIR laser (around 800nm) with modulated signal (varying duty cycle), with peak power around 1000mW, the output is desired to be connected to fiber optic. I am new to laser technology, and have googling around but can't find suitable laser module (complete set)...

Homework Statement A laser is fired into a wet paper placed ontop of a glass plate of thickness ##d## and an angle of ##0## degrees. When the light hits the paper and goes through the plate it forms a circle of light of radius ##R##. What is the index of refraction of the glass plate? Homework...

Hello, I am pretty new to physics but have a large amount of experience with Calculus and other sciences like chemistry. The theory I have come up with is that if I combine 6-8 5w laser beams together in a convex lens that can be moved forward or backward to change the focal point distance, I...

Now,we get the circular polarization photon using 1/4 waveplate, can we make a circular polarization laser directly through Stimulated Emission Radiation? or, when a electron transition from one level to another level,what kind of polarization of the photon, linear or circular? thank you!

I recently salvaged a Melles-Griot HeNe laser from an FTIR system. I neglected to save any of the electronics except for what I think is the step-up transformer attached to the laser tube. The laser is "05-LSC-708-540" and the transformer is "05-LPM-850-045". I have a 12V power supply, but was...

I recall hearing that if you have a sample of N molecules, then the output of a laser consisting of this sample has intensity proportional to N. I've been looking for such a derivation but cannot find one, and am wondering if this is still true. It seems somewhat intuitive but my intuition isn't...

Is it possible for me to make a flash light into a "laser" hot enough to burn through paper. Here is what I have: a light prism, 2 light splitters,(the can separate light so it goes 2 ways) 2 magnifying glasses, and a microscope.(I don't want to use it though) If there is any thing else you...

Hello everyone, I was just wondering if there is any type of transparent ink that could be permanently activated by heat or intense light (laser). Preferably I am planning to use a laser light to activate the ink. I am trying to coat a piece of metal (or paper or etc.) with this ink (which is...

This is a quick question. This entry in the Laser Encyclopedia states that transitions differing in the angular momentum quantum number "l" by 1 are allowed. Here is the link: https://www.rp-photonics.com/forbidden_transitions.html However, diagrams that show energy transitions labeled...

Homework Statement .[/B] I am attempting to determine the group refractive index of a laser cavity at it's resonance frequency. Homework Equations .[/B] \begin{align*} \frac{2\omega n L}{c} &= 2m\pi \end{align*} \begin{align*} n_g &= n + \omega \frac{dn}{d\omega} \end{align*} 3. The attempt...

Hi all, I'm having trouble finding something online which isn't a very complicated device, but I don't know if it has a specific name, which would help me in a google search. I have a motor in an MBE which moves the sample, and I need a camera which can read to a computer what the distance is...

When an IC photomask is being fabricated, a laser carefully dissolves specific portions of the photo resist to develop the precise pattern. But when we make ICs, we use a photomask to place over the silicon and shine coherent light over it at once. Since most of the engineering problems arise...

I work in a lab that uses laser probes to test for vibration and other data, currently the lab techs hook up the probe to a laser source and check to see how bright and clear the beam spot is. I have been working on having a signal power budget created for each probe using a laser source and...

Hey guys, I really need your help. I got the following task: "Sketch the output spectrum of a mode-locked Ti-Sapphire laser (assuming eg. gaussian shape) and calculate the shortest possible pulse duration by Fourier transformation." So the spectrum is gauss shaped but I have no clue how to get...

I recently received a laser cutter however, I cannot find anywhere not even in the manual what frequency it emits. It's a CO2 machine with a 180 watt laser. It's supposed to be able to cut metal. http://www.ebay.com/itm/121881769914 Can someone advise me on eye protection, I don't want to risk...

Hi, we set up a cheap laser pointer bouncing off a mirror that was hot-glued onto a balloon stretched over the end of a coffee can. The reflected light hit a cheap 3x5 solar cell that was plugged into a stereo's microphone jack. A person could speak into the can and their voice would be heard...

Hello! Double heterostructures are used in LEDs and lasers to provide both the confinement of the charge carriers and the confinement of the generated light. This image is a comparison between a homojunction and a heterojunction. As regards the unbiased junctions, when the n region and the p...

Hi, a general question involving heat, light, kinetic energy, and momentum. A man has a 100W laser. He fires the laser at a black body which absorbs the photons of the laser and gains heat energy from it. In practice the conversion efficiency from the 100W laser power to the black body...

I'm not sure I understand what information we can get from Photoluminescence Excitation (PLE) that we don't get from regular PL. Let's imagine we have a sample with emissions between 700nm and 850nm. If I'm not mistaken in a typical PL experiment you'd just use a laser source with a wavelength...

Why is it that equivalent length is so important for laser beam power output (Length = Power/60) - http://www.laserk.com/newsletters/whiteCO.html. I was reading that in order to get multiple kilowatts of power out of a CO2 laser beam you have to fold the beam a great number of times. Why is...

Will a laser diffract through a single slit if the laser beam width is smaller than the slit? Such that the laser beam can pass though without touching the sides.

Homework Statement Homework Equations F=(del)p/(del)t The Attempt at a Solution I understand how to do part a, but on part b I don't understand why the change in momentum is 2pi. I originally did the problem by just subbing (del)p with h/lambda. Why is it 2pi?

Homework Statement Show that the output coupling that maximizes output intensity (Iout=0.5tIsat(2gl/(t+s) -1) is given by t=sqrt(2gls)-s Homework EquationsThe Attempt at a Solution Iout/Isat=0.5tgl/(t+s)-0.5t 1=0.5tgl/(t+s)-0.5t 1+0.5t=0.5tgl(t+s) (t+s)+0.5t(t+s)=tgl this gives me a really...

This is actually a straightforward question, but I'm struggling to find answers because I don't know very much about lasers. I want to use a nonlinear crystal for frequency doubling in an infrared laser (1480 nm) so that the output is half @ 740 nm. I know that nonlinear crystals like KTP are...

Hello, I'm looking for a gas (hopefully one that is readily available) that will absorb Nd:YAG laser radiation at 1064 nm. The purpose is to heat the gas to transmit heat into a glass fiber composite which normally does not absorb IR light.

Homework Statement I'm working on a project right now, which uses laser beams and part of the project requires me to find a mathematical model which relates angle of projection to the intensity of the light. Does anyone know of an equation(s) which relates the intensity and angle together...

So I came across this article while looking for laser spectroscopy. From what I see most of the laser spectroscopy requires the laser to beam directly at the ample to retrieve a spectral image about the sample. I want to know if it is possible to reverse the spectral image back into a 3D image...

Hi, What does it mean when we say that the in the case of absence of a phase reference, the laser would produce a Poissonian mixture of number states?.. I got confused actually between the meaning of the phase in classical sense and quantum in this regard. Regards

Homework Statement A circular uniform laser beam has a power of P = 3.2 mW and a diameter of d = 8.5 mm. The beam is a form of electromagnetic raditation with both electric and magnetic field components. (a) Calculate the intensity of the beam in units of W/m^2 (b) Calculate the energy (delta...

Homework Statement Hi! I have lately come across some tricky experimental physics tasks, where no solution is given. Some of them involved parts where the focal length of a convex lens had to be measured with a laser. How do you do this? Homework Equations 1/l + 1/d = 1/f (1) where f is the...

1. Laser rangefinder is said to work by the laser reflecting from the object and the device measuring the distance.. but if the object is not reflective.. how can the laser bounce back? 2. Is the laser in the Laser rangefinder harmful to the eyes?

Just a quick question. We know that an accelerated electron shoots out light, and light that falls on an electron in an atom, excites it. But what happens to an electron in vaccum, when it encounters a laser beam? If an electron beam from an electron microscope, were to to intercept a laser...

Hi, I'm doing a module on quantum optics and lasers. Most of the texts and online source I have read simply state that 'population inversion is essential for amplification in laser operation'. My question is, why? Amplification/Gain is essentially the result of stimulated emission. Can't...

Hi all, I am interested in finding the power of a laser diode as function of the distance z, assuming a free space propagation. I think to have enough information to work it out but I am stacked at the moment. Given: the initial power, P0 = 1mW beam width clip (e-2 = 13.5%), wx = 3μm, wy =...

I think I understand why two level laser is not possible if we use optical pumping. However, I don't understand why we can't create laser with two energy levels that are pumped by non optical pump? Why we can't create population inversion that way? For example, if we could somehow pump...

Good morning all, I'm currently working in some undergraduate research involving lasers and recently had the opportunity to play around with a few that my research professor has at our disposal. I've included a picture below of a strange phenomenon that has me a little puzzled, but then again I...

I know fel operate a wide range of wavelengths, but does anyone know the main operating wavelength for the US navy's 1MW fel?

Hello, the resonator of a laser system is said to have 3 functions: Amplification in one direction, selection of one or few frequencies, and enhancement of coherence. I have a question about the coherence part. I see that the stimulated emission process produces phase matched light. Initially...

Hello, It is said, that the Helium part of the He-Ne-Laser is excited by gas discharge, using an external E-Field. First question: How should that work? gas discharge means ionisation, and ionisation is not exactly the same as excitement. Second: Why is it not possible, to directly excite the...

if I have laser beam irradiated normally on the target surface and in the same time time it is p- polarized. under these conditions, we will have the electric field which is completely parallel to the target surface and have a great effect on the target surface. my questions is; is this...

A high intensity continuous wave laser passes through an electron cloud. Please discuss what would happen and in relative amounts. Thanks

Will a laser exposed to ions (doped fibre) spread out in the direction of polarisation as momentum sends the peaks in one direction and the troughs in another. Or, as total momentum is 0 does the wave continue on straight.

Why can a laser only be focussed to within its wavelength? It says due to it being diffraction limited, what about focussing lenses and mirrors they don't involve diffraction. Please explain

I am doing some experimentation, for a science fair. And I want to make sure I the laser pointer I use is Class I (conceivably, I may change that, but any class of laser can be used to replicate results similar to the double slit experiment correct?). Can anyone direct me as to where I may be...

Hello. On a german wiki article I have found the operation principle of a range finder: https://de.wikipedia.org/wiki/Abstandsmessung_(optisch)#Lasertriangulation Here are two pictures for illustration: The Laser, the CCD sensor, and the lens are in a fixed relation to each other, inside a...

What is the intensity in W/m² of a laser beam used to burn away cancerous tissue that, when 94.0% absorbed, puts 539 J of energy into a circular spot 2.11 mm in diameter in 4.00 s?? I've tried a couple different equations and I keep getting the answer wrong. This is due tonight, I'm super...

While 2nd law of thermodynamics emphasizes past->future time direction, CPT theorem says that at least microscopic physics has some symmetry between past and future. For example the Feynman-Stueckelberg interpretation suggests to see anti-particles as traveling back in time. So thermodynamics is...

I think I am in a misconception concerning laser beams: Even the best lasers have a small line width. The spectral line is gauss-shaped. therefore the wave in position-pace is also a gauss-shaped wave packet, that travels with a certain group velocity. But this gauss shaped wave packet has a...

When blaster or laser is used to make a hole in a piece of metal is any of the matter of the metal completely eliminated from the universe?

hi im supposed to simulate a vcsel laser for my thesis i got problem in selecting physics.. i should check its heat transfer and threshold current but i don't know which physics should i choose ! does anyone know about vcsel's physical structure in Comsol ? by the way does anyone know that how...