เลเซอร์ - An Overview
เลเซอร์ - An Overview
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Should the attain (amplification) while in the medium is more substantial in comparison to the resonator losses, then the power of the recirculating gentle can increase exponentially. But Every single stimulated emission function returns an atom from its enthusiastic condition to the ground state, lessening the gain of your medium. With raising beam electrical power, The online achieve (acquire minus reduction) decreases to unity and also the get medium is claimed to be saturated. In a very ongoing wave (CW) laser, the balance of pump electrical power towards gain saturation and cavity losses generates an equilibrium value of the laser electricity inside the cavity; this equilibrium establishes the operating position with the laser.
Powerful laser is 'brightest gentle inside the universe'—The world's strongest laser as of 2008 might produce supernova-like shock waves And perhaps even antimatter
เครื่องแกะสลักเลเซอร์ เครื่องมาร์คไฟเบอร์เลเซอร์ 100w
In its place, the phrase "LASER" ended up being used for all gadgets running at wavelengths shorter than microwaves.
เรียนรู้เกี่ยวกับพื้นฐานของเลเซอร์ทั้งหมด เช่น หลักการออสซิลเลเตอร์ และคุณลักษณะตามความยาวคลื่น
Inside a Q-switched laser, the inhabitants inversion is allowed to Create up by introducing decline inside the resonator which exceeds the achieve on the medium; this can even be referred to as a discount of the standard component or 'Q' on the cavity. Then, once the pump Electricity saved while in the laser medium has approached the utmost attainable degree, the released decline system (generally an electro- or acousto-optical ingredient) is promptly taken off (or that occurs by itself in a passive device), allowing lasing to start which fast obtains the stored Vitality while in the attain medium. This brings about a brief pulse incorporating that Electrical power, and thus a higher peak energy.
Really significant powers in ultrashort pulses is often realized with Yb:YAG. Holmium-doped YAG crystals emit at 2097 nm and variety an successful laser working at infrared wavelengths strongly absorbed by water-bearing tissues. The Ho-YAG is usually operated inside of a pulsed manner and passed by optical fiber surgical products to resurface joints, take away rot from teeth, vaporize cancers, and pulverize kidney and gall stones.
A laser is made up of a obtain medium, a system to energize it, and a thing to supply optical picosecond laser คือ feedback.[27] The achieve medium is a material with Attributes that permit it to amplify light-weight By the use of stimulated emission. Mild of a particular wavelength that passes through the attain medium is amplified (electric power raises).
Semiconductor quantum dot lasers use quantum dots because the active laser medium. These lasers exhibit gadget efficiency that is certainly closer to gasoline lasers and stay away from several of the down sides of classic semiconductor laser media. Enhancements in modulation bandwidth, lasing threshold, relative intensity noise, linewidth enhancement component and temperature insensitivity have all been noticed.
เรียบเรียงโดย อาจารย์นายแพทย์จรัสพล รินทระ
เลเซอร์มาร์กเกอร์ / ระบบการมาร์กด้วยเลเซอร์
Recently, some hobbyists have taken an desire in lasers. Lasers used by hobbyists are usually of course IIIa or IIIb (see § Basic safety), Though some have produced their own course IV varieties.
ฉีดฟิลเลอร์ปาก เพิ่มความอวบอิ่มให้ริมฝีปาก และเต็มมากขึ้น