We know that a body which absorbs all kind of radiation falling on it is called black body.
The lasers having gas as an active medium is called gas lasers. Generally there are three classes of gas lasers.
Detectors are device used with lasers to detect or discover the presence of something. There are two categories of the detectors
The Q-Switch is a device which is placed inside the laser cavity. Main purpose of the Q-switch is to rapidly change the feedback of a laser cavity from minimum to maximum.
Currently there are a great number of materials available for use in the optical components.
Mostly the laser is not used by itself but rather, it is combined with a number of accessories and used as part of larger system.
There are four essential or basic components of laser, may be listed as:Active medium, Excitation mechanism, Feedback mechanism, Output coupler.
He-Ne stands for Helium-Neon. The He-Ne laser active medium consists of two gases which do not interact form a molecule.
The first working laser was built in 1960 by Maiman, using a ruby crystal and so called the Ruby laser.
The gallium Arsenide laser is designed in such a way that a piece of N-type Gallium Arsenide material is taken and a layer