LASER stands for Light Amplification by Stimulated Emission of Radiation. It is a device that emits a highly concentrated beam of light, which can be focused, directed, or manipulated for various applications. The unique feature of laser light is that it is coherent (its waves are in phase) and monochromatic (consisting of a single wavelength or color), making it different from regular light sources.
The operation of a laser is based on the principle of stimulated emission of radiation, first proposed by Albert Einstein in 1917.
Lasers can pose serious hazards to human eyes and skin due to their high intensity and focus. Different classes of lasers range from safe, low-power devices (Class I) to hazardous, high-power systems (Class IV), requiring proper precautions during use.
The laser is a revolutionary technology that utilizes the principle of stimulated emission to produce highly concentrated, coherent light. Its ability to be finely controlled and applied across diverse fields makes it one of the most significant inventions of the 20th century.