What is LASER? What are the main elements of a laser? Explain each in detail
Answers
A laser is constructed from three principal parts: An energy source (usually referred to as the pump or pump source), A gain medium or laser medium, and. Two or more mirrors that form an optical resonator.
Answer:A laser is constructed from three principal parts: An energy source (usually referred to as the pump or pump source), A gain medium or laser medium, and. Two or more mirrors that form an optical resonator.The principle of laser amplification is stimulated emission. ... A laser can not operate if the gain is smaller than the resonator losses; the device is then below the so-called laser threshold and only emits some luminescence light.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".Laser radiation has the following important characteristics over ordinary light source. They are: i) monochromaticity, ii) directionality, iii) coherence and iv) brightness. (i) Monochromaticity: A laser beam is more or less in single wavelength. i.e., the line width of laser beams are extremely narrow.Types of lasers - Solid state laser, Gas laser, Liquid laser & Semiconductor laser.Laser, a device that stimulates atoms or molecules to emit light at particular wavelengths and amplifies that light, typically producing a very narrow beam of radiation. The emission generally covers an extremely limited range of visible, infrared, or ultraviolet wavelengths.Lasers are commonly designated by the type of lasing material employed. There are four types which are: solid state, gas, dye, and semiconductor. ... One example is the Neodymium: YAG laser (Nd:YAG). The term: YAG is an abbreviation for the crystal: Yttrium Aluminum Garnet which serves as the host for the Neodymium ions.LASER: Light Amplification by Stimulated Emission of Radiation. LASER stands for Light Amplification by Stimulated Emission of Radiation.Properties of laser light are: monochromacity (the same color), coherence (all of the light waves are in phase both spatially and temporally), collimation (all rays are parallel to each other and do not diverge significantly even over long distances).The 3rd important characteristic of laser light that makes it unique is the coherence. Coherence means that the light waves are in phase. Laser light is much more coherent than ordinary light. It is impossible to detect this property with our eyes and therefore its important is some time over lacked.Principle #4: A green laser is more of a visual hazard than an equivalent red or blue laser. The human eye is most sensitive to green light. The chart below shows this more precisely. Wavelengths increase from blue on the left to red on the right.As a general rule, green lasers are 532nm are 5-7X brighter than any other laser color, at the same power. Whether blue, red, purple/violet, or a light color like yellow, green is the best at strength for visibility.
Explanation: