regulater
(1)调整器，调节装置
(2)调压
(2)调速器

• Launching fiber
• Launch numerical aperture
• Laurent half shade plate
• Laurent polarimeter
• Laval nozzle
• lavevorotaion
• law
• law of Beer
• law of Brewster
• law of combination of errors
• law of extreme path
• law of photoelectricity
• law of reciprocity
• law of reflection
• law of refraction
• Law of refraction, snell's law
• Law of reversibility
• Lawson criteria
• Lawson criterion
• layer
• layered laser
• layered target
• layer optics
• layer-to-layer transfer
• laying