Recent content by AlexLAV

And does an ordinary crystal YAG glow? May be there are some admixtures?

As far as I know pure YAG crystal is transparent at this wavelength. What is the reason for the luminescence do you mean?

I also think the orange glow is due to admixtures originated from heated steel surface. It may be any solid particles such as ferrum oxide, or may be soot. Moreover Fe atoms have a lot of emission spectral lines within the visible range, and there may be some other admixtures, such as Na atoms...

Powerfull laser beam of visible wavelength is visible in the air under day light. For example 532-nm laser beam with few millimeters in diameter can be visible at power of several watts. The main reason of its visibility is scattering on dust particles. But even in dust-free air there is some...

I don't understand - if the average power is 300 W while the peak one is 750 W, it should mean the pulse duration is about 400/2.5 mus. Am I wrong?

Writing "type of the laser" I had in mind not only type of the active medium but also the mode of operation? i.e. free running or Q-switched or mode locking. I'm not familiar with gas lasers but I have asked one of my friend who worked with them. He answered typical pulse duration depended on...

I think there should not be a problem keeping contents of the container under some moderate temperature, if proper thermal insulation is ensured. The best thermal insulation at low and moderate temperature is vacuum (it is used in vacuum flask). Suppose the content temperature is about +20...

The more any substance reflects the less it radiates. Metals have high reflectivity in IR spectrum hence they generally are poor thermal radiators. At room temperature emissivity of aluminium is about 0.09, while emissivity of gold is about 0.02-0.04.

The pulse repetition rate and the pulse duration do not correlate, generally speaking. Base on the provided data one can say only that the pulse duration is less than 400 microsec :-) . The most reliable way is measurement of the pulse width by fast enough photodiode and oscilloscope. If the...

May be I don't understand something, but if natural reflectivity of the surface is less than 100 %, you probably can use some cover with the reflectivity higher than that of the surface. With respect to multilayer dielectric mirror, typical reflection coeficient of so called high-reflectivity...

I think it is no thermodynamics but heat engineering most likely. It is a problem of heat transfer under convection (natural convection within the box and forced one- since there may be wind- outside). The problem is very difficult for strict solution, but approximate methods of estimations are...

I don’t know that is energy weapon, but I suppose you mean some device emitting electro-magnetic radiation, such as a laser. In that case the recoil is equal E/Mc indeed. Concerning kinetic energy weapon, shooting a projectile, the recoil velocity is V=p/M (if V<<c), where p- impulse of the...

Thinking of photons the explanation may look like the following. According Heisenberg uncertainty principle dx*dp if of order of Plank constant h, dp – uncertainty of photon impulse, and dx – is uncertainty of location of its origin. Since any microscope collects photons only from limited...

I met with use OD under e base also. May be it was inaccurate use.

I think if the slug mass is 600 tons, while the launcher weights only 8,000,000 tons the recoil must be significantly higher than 2.2 km/sec (more than 10 km/sec to my estimation).