What Is laser light?
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A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The term "laser" originated as an acronym for "light amplification by stimulated emission of radiation".[1][2][3] The first laser was built in 1960 by Theodore H. Maiman at Hughes Research Laboratories, based on theoretical work by Charles Hard Townes and Arthur Leonard Schawlow.
A laser differs from other sources of light in that it emits light which is coherent. Spatial coherence allows a laser to be focused to a tight spot, enabling applications such as laser cutting and lithography. Spatial coherence also allows a laser beam to stay narrow over great distances (collimation), enabling applications such as laser pointers and lidar. Lasers can also have high temporal coherence, which allows them to emit light with a very narrow spectrum, i.e., they can emit a single color of light. Alternatively, temporal coherence can be used to produce pulses of light with a broad spectrum but durations as short as a femtosecond ("ultrashort pulses").
How does a laser light work?
A laser is created when the electrons in atoms in special glasses, crystals, or gases absorb energy from an electrical current or another laser and become “excited.” The excited electrons move from a lower-energy orbit to a higher-energy orbit around the atom's nucleus.
What is laser in simple words?
A laser is a machine that makes an amplified, single-colour source of light. It uses special gases or crystals to make the light with only a single color. The gases are energized to make them emit light. ... The word "laser" is an acronym for "light amplification by stimulated emission of radiation".
How is laser light different from ordinary light?
Ordinary light is divergent and incoherent whereas laser light is highly directional and coherent. Ordinary light is mostly unpolarized whereas light from a laser is polarized. Ordinary light is polychromatic ( contains all colors of light) whereas light from a laser is monochromatic.
What are 3 types of lasers?
There are four types which are: solid state, gas, dye, and semiconductor. The characteristics of each type will be described. Solid State Lasers employ a lasing material distributed in a solid matrix. One example is the Neodymium: YAG laser (Nd:YAG).
Why are green lasers banned?
And yes, lasers above 5 mW are commercially available in the United States, but it is illegal to market them as Class IIIa devices. ... Reflecting back off of the dust and suspended particles in the atmosphere, a green laser provides a pointer beam allowing the user to trace out constellations and faint objects.
What is the basic principle of laser?
Basic Principles of Lasers. To explain the process of light amplification in a laser requires an understanding of the energy transition phenomena in the atoms of its active medium. They include: spontaneous emission, stimulated emission/absorption and non-radiative decay.
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