A maser is a device that produces coherent electromagnetic waves through amplification by stimulated emission.
The Magnetron is a high power microwave oscillator, uses the interaction of electric and magnetic fields in a cavity to produce oscillations of very high power.
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 used with laser systems which further splits in their types.
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:
He-Ne stands for Helium-Neon. The He-Ne laser active medium consists of two gases which do not interact form a molecule. Therefore He-Ne laser is one type of atomic gas lasers.
The first working laser was built in 1960 by Maiman, using a ruby crytal 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 of natural gallium aluminum arsenide material is pa