laser low level laser

It is an acronym for Light Amplification By Stimulated Emission Of Radiation . It is a process by which we get a coherent, highly monochromatic and perfectly parallel beam of light. Lasers may also be called as optical masses. It has been invented and developed in 1959. The 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 arranged energy lev..

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..

Helium - Neon Gas Laser - The figure shows the elements of a type of laser that is often found in student laboratories. The glass discharge tube is filled with a 80%-20% mixture of the inert gases helium and neon. Helium is the "pumping" medium and neon is the "lasing" medium. T..

How a Laser Works - 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 f..

The smallest lasers used for telephone communication over optical fibres have as their active medium a semiconducting gallium arsenide crystal about the size of a pin-hea..

Atoms and Nuclei..

The laser is an acronym for Light Amplification by Stimulated Emission of Radiation. The laser has been invented and developed in 1959 and 196..

Microsurgery is any operation done with the aid of microscopes. Surgeons work with spectacle - mounted magnifiers or with microscopes. Using this technique, surgeons can remove adenoma, tumours of the pituitary gland, without damaging the gland itself. Neurosurgeons, ear and eye surgeons all rely o..

A laser beam departs from strict parallelism only because of diffraction effects, determined by the wavelength and the diameter of the exit aperture. Light from other sources can be made into an approximately parallel beam by a lens or a mirror, but the beam divergence is much great..