Light Amplification by Stimulated Emission of Radiation. A means of creating coherent light by either driving an atomic or molecular transition in an optical cavity or firing a beam of electrons through an undulator.

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63 views

What determines laser frequency?

I am studying Lasers and frequency combs - and am not quite understanding something. I understand the working principle of a laser, and thought the Laser output frequency is just the energy gap ...
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2answers
294 views

What is the amplitude of the electric field in a laser?

I'm looking for reliable informations about the amplitude (not the intensity), in volt/meter, of the electric field in a typical laser. Or in other words : what are the typical amplitudes of the ...
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0answers
17 views

What does “Polarization Gradient Cooling” mean?

I'm well versed with what "Polarization Gradient Cooling" refers to, as in how the process works and what the term refers to, but the term itself baffles me. What is a "Polarization Gradient"? The ...
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54 views

The Nonlinear Schrodinger Equation (NLSE) [closed]

I am trying to show that the NLSE: $$\frac{\partial A(z,T)}{\partial z} = -i \frac{\beta_2}{2} \frac{\partial^2A}{\partial T^2} + i \gamma |A|^2 A$$ may be cast in the form: $$\frac{\partial ...
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26 views

What's the procedure of “Chirped Pulse Amplification Process”?

We have a pump source, single-frequency green laser, with such properties:power 14w;wavelength 532nm. We have another seed source, mode-locked titanium:sapphire laser, with such properties: wavelength ...
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1answer
25 views

Diffraction pattern from laser shone on coffe-filter plastered on glass pane

I make an ordinary coffe filter wet and plaster it on a glass pane. I then shine a laser onto the filter (on the side of the pane with the coffe filter). When I do this, I see what I assume is an ...
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1answer
54 views

Range of modern laser beam

Is today there the prospect of communication using lasers a distance of approx. 50-150 light-years? If so, what is the maximum range which can be achieved with modern laser power, eg. 1000W? We assume ...
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29 views

Light scattering - creating an atmosphere that a laser will be visible in

I need to show the beams of red, green, yellow and violet lasers 100mW Red + 40mW Green for a demonstration in a darkened room that holds 150 people. The room has sensitive fire alarms that use ...
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1answer
34 views

combination of lenses for undefined focal length

Good morning! I am not an optics specialist, but I need to know if it's possible to do what I tried to visualise in my picture. Basicly I want to merge two beams into one. I am thinking of using a ...
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1answer
58 views

How are professional laser shows done [closed]

How are professional laser shows done ? I need an explanation of the phenomenon of a laser visible in mid air ,(NOT THE APPARATUS USED which means I don't want the engineering aspect of it,I only want ...
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11 views

Can I simulate the motion of resonant scanner with a laser beam incidence and reflection using Comsol? Or I need to use different software?

I'd like to see the motion of the beam incidence onto a resonant scanner travels with 20 degrees wide. It is important to see the reflection inside a closed hollow geometry
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0answers
88 views

Non-semiconductor CW laser types for 445-465nm

Am I missing something in this list of non-semiconductor CW laser types to get emission in the range of 445-465nm? Are there any crystals directly emitting in this range with UV pump? Currently I am ...
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1answer
34 views

What is the difference between ultrafast laser and normal laser?

I was reading an article of latest innovation and i came across this 'ultrafast laser' term. What is the difference between it and the laser we normally refer?
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1answer
54 views

Can you concencrate paralel laser beams?

I've seen some videos of laser toys but they all seem to use either one laser or lens with some specific range of focus. What I was thinking is this: But it seems like it might violate the 2nd law ...
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0answers
36 views

Can a simple harmonic oscillator describe Rabi oscillations?

I've been trying to simulate a resonant laser oscillation of a two level atom with Rabi frequency $\Omega$ and a rate of spontaneous emission $\Gamma$. So the wavefunction would be $\mid \Psi\rangle = ...
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2answers
69 views

Can a beam splitter distinguish between more than two polarizations?

The following is based on a very basic understanding of lasers, that may be approximate or altogether completely erroneous. Given a (single-mode) laser beam, a beam-splitting polarizer ...
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2answers
54 views

Can a laser beam be captured in prism?

is there a way to shoot a laser at a prism (or something) and have it glow when the laser hits it? I want to make a small box with a small hole in it. With the prism in the box, when the laser is ...
117
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2answers
9k views

Why does a mirror split my laser beam?

Last night my daughter was asking why a mirror "always does that" (referring to reflecting a spot of light). To help her figure it out, I grabbed my green laser pointer so she could see the light ...
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1answer
59 views

What's the difference between stimulated and spontaneous emission in lasers and diodes?

I know that an LED emits light by spontaneous emission. To get more coherent and Monochromatic light, we should use a laser. What is the reason that laser light is the most coherent and ...
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1answer
72 views

Can a high-watt laser's scattering light be damaging to the eyes? [closed]

Heyo, I recently purchased a S3 Arctic Class IV laser pointer. I bought the 3500mW. (In case that page expires, it's 445nm wavelength, 1.5mRad variant, NOHD is 279m, beam distance at 0.25 Lux 72km.) ...
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0answers
46 views

Introductory books or good review paper on Free Electron Lasers

I am looking for a beginners' book on Free Electron Lasers, particularly regarding the principles of the mechanism rather than the details of the implementation. I am particularly interested on the ...
0
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1answer
41 views

“Classical” Coherence

I'm having a couple of courses where the concept of coherence is quite important. I know the traditional definition of coherence and it's connection to the phase of a wave. But often, I found, that ...
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72 views

Laser shone at liquid jet

When a liquid jet of water falls in laminar flow, it hits a surface. If this contact point, between the surface and the jet, is illuminated by a laser. Rings of light can be seen forming around the ...
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2answers
30 views

Stimulated emission process in lasers, Is the atom making transition a correct statement?

I was studying the Lasers, there is a section on absorption and the author is giving the statement as "An atom in lower energy state E1 may absorb the incident photon and may be excited to E2 . This ...
2
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1answer
56 views

LASERS: How do we get all the emitted photons of equal wavelength & equal phase? [duplicate]

As far as the working of lasers is concerned, I was convinced till the part that the light flashes on a ruby stone and the electrons are excited and then again go back to their ground state and then ...
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1answer
37 views

Compare how much a coherent laser visible green light beam spreads out with a incoherent green light beam.

Suppose I am mathematically modeling a visible green laser pointer beam which starts from the ground and ends up a half mile or full mile in the sky, projected upon an aircraft window 2 inches thick. ...
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2answers
86 views

how to find a laser beam

Let's say that you want to know if there is a laser beam around a big area, like a stadium. Or an airport. How could you detect and find a such laser beam (could be by a laser pointer or something ...
2
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1answer
66 views

Is there any issue/concern for a slight wavelength shift of the laser light in the LIGO experiments? [duplicate]

A friend and I were having a discussion about the LIGO experiments and were wondering if there is any issue with the laser light undergoing a wavelength shift as a result of the gravitational wave? ...
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80 views

DIY optical band pass filter or another alternative

I need to detect laser using a solar cell which would need me to either detect the laser wavelength or use pulse modulation and detect the frequency so I'm kinda here to ask if it's possible to simply ...
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30 views

optoelectronics-smallest wavelength of light

Sorry this maybe a stupid question , but i need to know: A few minutes ago i have read an article about optoelectronics: worlds first optical single atom switch The writer of the article ...
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1answer
58 views

Will I see the light?

There is a perfectly smooth wall. We have a slit parallel to it. Through that a laser beam passes. As the slit is parallel to wall the laser beam will hit it normally. So now if I see obliquely I ...
4
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2answers
173 views

Why does a laser beam stay collimated?

I am looking for a simple way of explaining the collimation of a laser beam. The typical discussion of the two slit experiment of quantum theory relies heavily on the Huygens principle. Its ...
0
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1answer
44 views

Drawing in the air with lasers Question

Are there two different lasers that can be invisible when not overlapping, but visible when overlapping? I desire to build a hologram-ish thing, but with lasers. The system would use many lasers that ...
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1answer
54 views

What would happen if light was stored in a circular path? [closed]

This is like an idea for experiment. Lets say one has an optical cable that makes a circle. There is a little Y junction/valve to the circle, through which one pumps some coherent light in. The ...
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1answer
47 views

Is it possible to get a lasing from every luminescent media?

Let's assume that there is a cavity with a couple of mirrors and gain media between which possesses luminescence under some external excitation/pumping. Let the absolute quantum yield of the gain ...
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0answers
43 views

Natural linewidth of hyperfine levels?

The D2 line of $^{87}Rb$ is the transition between the $5^2$$P_{3/2}$ and the $5^2$$S_{1/2}$ states. Its linewidth $\Gamma$ is always quoted to be $\sim 6 MHz$. But both states have hyperfine ...
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1answer
36 views

Frequency combs: comb line spectra from periodic pulse train?

Stabilized frequency combs can be generated using femtosecond mode-locked lasers after $f_{CEO}$ and $f_{rep}$ stabilization. Numerous sources have also pointed out that the periodic pulse train ...
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2answers
34 views

Frequency modulation in laser locking - what frequency?

In laser locking, e.g. using the PDH technique, the light (say of frequency $f$) is modulated so as to add two symmetric sidebands of frequency $\Omega$. I know the maths, I understand how this leads ...
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0answers
47 views

If I aimed two identical lasers at a screen, what would the interference pattern look like? [duplicate]

If I aimed two identical lasers at a distant screen, what would the interference pattern look like? Could this be modelled as a wavefront passing through two slits, i.e. the double slit experiment? I ...
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50 views

Coupling into FC/APC fiber

I am currently attempting to couple a 405nm laser diode into FC/APC fibre. The fibre is mounted on a flexure stage approximately 15.3mm from an f=15.29mm lens. I have managed to couple into the core ...
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1answer
39 views

Resources on solid state laser resonator design and modelling

I'm an experimentally oriented physics student and have been fascinated by lasers for a longer time. I'm currently building a diode-pumped, frequency-doubled Nd:YVO4 laser from scratch. Before I start ...
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4answers
2k views

Do free-electron lasers actually lase?

Free-electron lasers are devices which use the motion of highly energetic electron beams to produce bright, coherent radiation in the x-ray regime. More specifically, they start with a high-energy ...
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2answers
31 views

Can you pass 400mJ laser light through a fiber?

What is the energy limit for fibre optics? For a dual-pulsed nd:yag laser firing at 10Hz with energy roughly 2x 400mJ, and pulse width ~5-10ns. My gut says that this is far too high to pass through ...
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2answers
67 views

Is an x-ray maser possible?

I was wondering if lasers evolved from masers. They applied the same principles to a different wavelength. Would it be possible to create a maser at a higher wavelength, using x-rays, gamma rays, ...
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1answer
42 views

Minimum Power Required to Maintain a Population Inversion

According to many sources, the minimum power required to maintain a population N in the upper level of a two level laser system is $$P_{min}=fA_{21}Nh\nu$$ where $f$ accounts for the lack of 100% ...
0
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1answer
18 views

Is Light Amplification Synchronise Electron/Positron Radiation possible?

Light Amplification Stimulated by Emission of Radiation vs Light Amplification by Sychronised Electron/Positron Radiation By applying a "custom" undulator(a series of powerful magnets) to break up ...
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1answer
68 views

What will happen in this LASER setup?

If I have 3 rectangular mirrors, say of dimensions length of 1 meter and width of 0.5 meter and I arrange them in the form of an equilateral triangle, which is of side 0.5 meter.(The mirrors are ...
3
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35 views

Book on spectroscopy (line dependency on parameters)

I am trying to find a book (undergraduate level) on Spectroscopy. I am interested in how molecular absorption lines depend on parameters like temperature and pressure (for example with gases). Can ...
3
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2answers
56 views

Does laser light with less than the work function still ionise some atoms?

If a gas is illuminated with a laser of a frequency less than (but more than half of) the work function of the atoms in the gas, the atoms will be excited into Rydberg atoms. Is there a finite chance ...
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2answers
110 views

Laser cooling of atoms: more area or more power?

I want to optimise a Magneto-Optical trap. Laser beams come from the the x, y and z directions (positive and negative) and slow the atoms down. Would it be better to increase the beam spot-size ...