The Evolution and Wide Range of Applications of Lasers

TLDR Lasers, developed based on quantum physics, have a wide range of applications and have become one of the most important inventions of the last 100 years. From medical treatments to industrial cutting, fiber optic cables to military uses, lasers have revolutionized various sectors of the economy.

Timestamped Summary

00:00 Lasers are a source of light that were developed based on the principles of quantum physics and have a wide range of applications.
02:00 The concept of stimulated emission, which allows for the creation of coherent light, was first proposed by Einstein and later implemented in the construction of the first device known as a maser in the 1950s.
03:35 The first working laser was created by Theodore Meinman at the Hughes Research Laboratories in Malibu, California, using a synthetic ruby crystal as its medium and producing light at a wavelength of 694 nanometers through stimulated emission.
05:21 The first laser used a synthetic ruby, but lasers can be made with different substances and mediums, such as gas, solid, or liquid, and they have since found a multitude of practical applications, including medical treatments and industrial cutting.
07:00 Lasers using fiber optic cables transmit almost all of the internet's data and are responsible for an ever larger percentage of bandwidth to people's homes, and lasers have been used to measure the distance to the moon for almost 50 years with great accuracy.
08:32 Lasers have been used in various applications, including manipulating atoms, military uses such as shooting down missiles and developing nuclear fusion, range-finding for aircraft and cruise missiles, creating 3D maps with LIDAR, and laser pointers.
10:07 The availability and low cost of commercial laser pointers is a testament to how lasers have become widely used in various sectors of the economy, making them one of the most important inventions of the last 100 years.
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