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Laser engraving metal plates are manufactured with a finely polished metal, coated with an enamel paint made to be "burned off". At levels of 10 to 30 watts, excellent engravings are made as the enamel is removed quite cleanly. Much laser engraving is sold as exposed brass or silver-coated steel lettering on a black or dark-enamelled background.
The CO 2 laser is suited for cutting, boring, and engraving. The neodymium (Nd) and neodymium yttrium-aluminium-garnet lasers are identical in style and differ only in the application. Nd is used for boring and where high energy but low repetition are required. The Nd:YAG laser is used where very high power is needed and for boring and engraving.
K40 may refer to: BMW K 1300 S (K40) Sportbike from BMW Motorrad; HMS Peony (K40), a corvette of the Royal Navy; INS Eilat (K-40), a destroyer of the Israeli Navy; INS Veer (K40), a corvette of the Indian Navy; Piano Concerto No. 3 (Mozart), by Wolfgang Amadeus Mozart; Potassium-40, an isotope of potassium; Redmi K40, a smartphone; Toyota K40 ...
The population inversion in the laser is achieved by the following sequence: electron impact excites the {v1(1)} quantum vibrational modes of nitrogen. Because nitrogen is a homonuclear molecule, it cannot lose this energy by photon emission, and its excited vibrational modes are therefore metastable and relatively long-lived.
445–450 nm blue laser (middle) Prior to the 1960s and until the late 1990s, gas and argon-ion lasers were common and suffered from poor efficiencies (0.01%) and large sizes.
Potassium-40 (40 K) is a long lived and the main naturally occurring radioactive isotope of potassium.Its half-life is 1.25 billion years. It makes up about 0.012% (120 ppm) of natural potassium.
Steel engraving is a technique for printing illustrations based on steel instead of copper. It has been rarely used in artistic printmaking, although it was much used for reproductions in the 19th century. Steel engraving was introduced in 1792 by Jacob Perkins (1766–1849), an American inventor, for banknote printing.
Disc rot is the tendency of CD, DVD, or other optical discs to become unreadable because of chemical deterioration. The causes include oxidation of the reflective layer, reactions with contaminants, ultra-violet light damage, and de-bonding of the adhesive used to adhere the layers of the disc together.
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