All articles starting with L
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Lascar
A lascar was a sailor from South Asia or the Indian Ocean region employed on European ships, a term first used at sea by the Portuguese in the early 1500s.
Lascăr Catargiu
Lascăr Catargiu (1823–1899) was a Romanian conservative statesman who served four terms as prime minister and led the Conservative Party from 1880 until his death.
Lascas
Lascas is a 1901 book of poems by the Mexican poet Salvador Díaz Mirón, written during and after his imprisonment and considered a precursor of modernismo, the Spanish American modernist movement.
Lascaux
Lascaux, also known as the Lascaux cave, is a decorated Upper Paleolithic cave near Montignac in southwestern France, famous for animal paintings made roughly 21,500 to 21,000 years ago.
Lascelles Brown
Lascelles Brown (born 1974, Clarendon, Jamaica) is a brakeman who competed for Jamaica, Canada, and Monaco; first Jamaican-born Winter Olympic medallist, with two-man silver at Turin 2006 and four-man bronze at Vancouver 2010.
Lascelles Principles
Lascelles Principles: British constitutional convention from Sir Alan Lascelles's 1950 'Serex' letter to The Times, setting three conditions under which the monarch may refuse a Prime Minister's request to dissolve Parliament.
Lascivious behavior
Lascivious behavior (lewd and lascivious conduct): a criminal-law category for lewd, obscene sexual conduct, defined variously by US state statutes such as Florida §798.02 and Kansas §21-5513, with penalties from misdemeanor to felony.
Lasdona Chasma
Lasdona Chasma is a 697 km chasma (trough) on Venus, centered at 69.30 N, 36.80 E, IAU-approved in 1985 and named for the Lithuanian main forest goddess.
LASEK
LASEK (laser epithelial keratomileusis) is a surface laser eye surgery for myopia and astigmatism, a modification of PRK that preserves the epithelium while avoiding LASIK flap complications.
Laser
A laser is a device producing a narrow, intense beam of coherent light by stimulated emission, first demonstrated in 1960 and now central to telecommunications, medicine, and manufacturing.
Laser (dinghy)
The Laser, since 2019 formally the ILCA, is a single-handed one-design sailing dinghy designed in 1969 and 1970 by the Canadians Bruce Kirby and Ian Bruce.
Laser ablation electrospray ionization
Laser ablation electrospray ionization (LAESI) is an ambient mass spectrometry method, reported in 2007, that analyzes water-rich samples like living plants and single cells with no preparation.
Laser ablation inductively coupled plasma mass spectrometry
Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) is an analytical technique in which laser pulses vaporize solid samples for elemental and isotopic analysis by ICP-MS.
Laser ablation synthesis in solution
Laser ablation synthesis in solution (LASiS), also called pulsed laser ablation in liquids (PLAL), focuses pulsed laser light onto a solid target in a liquid to make colloidal nanoparticles.
Laser absorption spectroscopy
Laser absorption spectroscopy is an optical technique that scans a narrow-linewidth laser across a gas's absorption lines, identifying species and quantifying concentrations from ppm to ppt in real time.
Laser altimetry
Laser altimetry is a remote sensing method that measures surface elevation from the flight time of laser pulses, used in studies of ice, land, vegetation, and water.
Laser Angioplasty
Laser angioplasty, also called excimer laser atherectomy or CLiRPATH, is a catheter procedure using pulsating laser beams to vaporize arterial plaque instead of a balloon; niche use remains after early trials showed no restenosis benefit.
Laser annealing
Laser annealing is a semiconductor manufacturing technique that uses pulsed laser energy to activate implanted dopants and repair crystal damage while heating only a thin surface layer.
Laser beam welding
Laser beam welding, also called fiber laser welding, is a welding process that joins metals with a focused laser beam, producing narrow, deep welds at high speeds.
Laser capsulotomy
Laser capsulotomy, or YAG laser posterior capsulotomy, is an outpatient ophthalmic procedure using an Nd:YAG laser to open the clouded lens capsule after cataract surgery.
Laser capture microdissection
Laser capture microdissection, also called laser microdissection, is a technique that uses a laser to isolate specific cells from stained tissue sections for DNA, RNA, and protein analysis.
Laser chemical vapor deposition
Laser chemical vapor deposition (LCVD) is a thin-film fabrication method in which a focused laser locally heats a substrate or excites precursor gases, enabling direct writing of microstructures.
Laser cladding
Laser cladding, also known as Laser Metal Deposition or Directed Energy Deposition, uses a laser to melt metal powder or wire onto a substrate as a dense, metallurgically bonded coating.
Laser coagulation
Laser coagulation is a medical procedure using focused laser light to heat tissue and denature proteins, sealing vessels or destroying lesions; in the retina it is called photocoagulation.
Laser communication in space
Laser communication in space, also known as free-space optical communication, transmits data between spacecraft and ground stations using laser beams, offering data rates 10 to 40 times higher than radio.
Laser Communication Terminal
A laser communication terminal is an optical transceiver on a satellite, aircraft, or ground platform that sends data at megabit to gigabit rates over laser beams across thousands of kilometers.
Laser Communications Relay Demonstration
The Laser Communications Relay Demonstration (LCRD) is a NASA technology demonstration payload, hosted on STPSat-6 and launched in 2021, that demonstrates two-way laser communications.
Laser cooling
Laser cooling, or optical refrigeration, is a set of techniques that use laser light to slow atoms and ions, cooling gases to within microkelvin of absolute zero.
Laser cooling of molecules
Laser cooling of molecules uses repeated absorption and emission of resonant laser light to cool molecular gases, demonstrated from 2010 on SrF and now used for precision measurement and quantum science.
Laser Corneal Surgery
Laser corneal surgery (LASIK, PRK/TransPRK, SMILE) reshapes the cornea with excimer or femtosecond lasers to correct myopia, hyperopia, and astigmatism; evidence shows comparable efficacy and predictability across modern techniques.