Archive for the ‘Photonics’ Category

Nuclear Fusion

May 12, 2010

Why is this way of energy so thoroughly pursued by scientific community?

Because the energy produced by the union of two primary light nuclei  into a heavier one is very high and the residues have low radioactivity.
Not all fusion reactions produce the same energy, the most common one is Deuterium + Tritium = Helium + neutron that produces 17,6 MeV , but even the easiest to produce is very hard to achieve.

There are many engineers , and physicists working hard in finding the way to produce fusion as a real source of energy.

One of the methods in which the scientist  believe harder  is Inertial Confinement Fusion
basically it works making to coincide numerous high power lasers in a dense metal, hohlraum , that produces X-rays of very high energy making the  nuclei  reach incredible high temperatures boosting the fusion probabilit

The premises in wich it is being proved this kind of fusion are  NIF (National Ignition Facility) in US and  LMJ (Laser Mega Joule) in France, with the same energy than NIF, but 240  laser beams instead  192, what gives  more flexibility (and complexity) to the installation.

 Some NIF  images 

Today North Korean newspapers published they succeed in fusion using this method. The coincidence with the birthday of the deceased  founder of  korea  festivity, the militar interest in nuclear weapons of the country and the luck of evidences makes the information not very trustful.

Laser light

May 4, 2010

 

Let me explain what laser is in a few words.

The word laser is an acronym for Light Amplification by Stimulated Emission of Radiation. 

Visible light is a mixture of different wavelengths

Laser light is the result of filter one of this wavelengths and boost his intensity by rebooting into a cavity wich  length between the mirrors inside, is a multiple of the  wavelength  in order  to generate constructive interactions. 

The source of the light, the way to increase the intensity, and the materials used make the difference in the numerous  lasers developed.