1 watt lasers

in the following way. The system can be a solid, liquid or gas but is taken in the form of a cylinder. A system is chosen which has a lower energy E 1 , a higher energy E 2 . Using some technique the number of atoms in state E 2 is made higher than that in state E 1 . In this..

Ruby Laser - In 1960, T .H. Maiman constructed the first laser using a Ruby crystal. Ruby is a crystalline form of silica(Al 2 O 3 ) with a slight natural doping of chromium. It has the following advantages for being used as a laser. (i) It is a solid having suitably a..

Applications of Lasers - The development of the laser has opened many avenues of investigation and improved many others. The important characteristics that have contributed to its usefulness in these many areas are tile coherence, monochromaticity and great intensity of its radi..

Atoms and Nuclei..

>Most stimulated emission photons initially produced in the discharge tube will not happen to be parallel to the tube axis. These will be quickly stopped at the walls. Stimulated emission photons that are parallel to the axis, can move back and forth through the discharge tube many times by success..

Tungsten light, spread over a continuous spectrum, gives us no basis for comparison. The light from selected lines in a gas discharge tube, however, can have wavelengths in the visible region that are precise to about 1 part in 10 6 . The sharpness of definition of laser light ..

This property is related to the parallelism of the laser beam. As for star light, the size of the focused spot for a laser beam is limited only by diffraction effects and not by the size of the source. Flux densities for focused laser light of 10 1 5 W cm ..

The below figure shows schematically how a population inversion can be achieved so that laser action-or lasing us it is called can occur. Atoms from the ground state E 1 are "pumped" up to an excited state E 3 , for example by the absorption of light energy from an intense conti..

The laser is an acronym for Light Amplification by Stimulated Emission of Radiation. The laser has been invented and developed in 1959 and 1960. In the laser, the maser principle has been extended to optical or visible light frequencies of 10 1 4 to 10 1..

Communication Systems..