The Basic Principles Of เลเซอร์
The Basic Principles Of เลเซอร์
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A photon with the correct wavelength to generally be absorbed by a transition may also result in an electron to drop from the higher for the decrease level, emitting a fresh photon. The emitted photon specifically matches the original photon in wavelength, period, and path. This process is known as stimulated emission.
เหตุใดเลเซอร์เซมิคอนดักเตอร์จึงแตกต่างจากเลเซอร์ชนิดอื่น?
มีการใช้งานอย่างแพร่หลายสำหรับการวัดโปรไฟล์ ฯลฯ เนื่องจากมีเอาต์พุตต่ำ
เครื่องขึ้นรูปกระดาษทิชชูรูปพระจันทร์เสี้ยว
ประวัติศาสตร์ที่น่าสนใจของเลเซอร์: ต้นกำเนิดและความก้าวหน้า
In many lasers, lasing begins with spontaneous emission into your lasing method. This First light is then amplified by stimulated emission from the acquire medium. Stimulated emission produces light-weight that matches the input signal in path, wavelength, and polarization, whereas the section of your emitted light-weight is 90 levels in direct from the stimulating light-weight.[32] This, coupled with the filtering influence of your optical resonator presents laser gentle its attribute coherence, and will give it uniform polarization and monochromaticity, with regards to the resonator's style.
Excimer lasers undoubtedly are a special kind of gas laser powered by an electric discharge wherein the lasing medium is definitely an excimer, or even more specifically an exciplex in current designs. They are molecules that may only exist with one particular atom in an enthusiastic electronic condition. As soon as the molecule transfers its excitation Electricity to a photon, its atoms are no more sure to each other, plus the molecule disintegrates. This greatly lowers the inhabitants in the lessen energy condition Therefore drastically facilitating a inhabitants inversion.
In case the utilized pump energy is simply too tiny, the get won't ever be adequate to beat the cavity losses, and laser mild will not be produced. The minimum amount pump electric power needed to start out laser action is known as the lasing threshold. The gain medium will amplify any photons passing by means of it, despite direction; but just the photons in a spatial mode supported because of the resonator will move greater than after with the medium and acquire substantial amplification.
Course 3R (formerly IIIa) lasers usually are as many as 5 mW and contain a little threat of eye destruction inside the time of the blink reflex. Staring into such a beam for several seconds is probably going to cause harm to a location to the retina.
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This lets the pump propagate a large amount of electrical power into and รักษาสิว thru the Lively interior core region even though even now using a superior numerical aperture (NA) to possess effortless launching circumstances.
เครื่องเลเซอร์มาร์คกิ้งสำหรับพลาสติก
เครื่องเลเซอร์มาร์คกิ้งสำหรับพลาสติก
เป็นเล่มที่พลาดไม่ได้ หากคุณต้องการดูเลเซอร์รุ่นต่างๆ ก่อน!