ALD LASER Test - 11 May 2025 Exam Questions With 100% Correct Answers

ALD LASER Test - 11 May 2025 Exam Questions With 100% Correct Answers Who theorized the concept of stimulated emission? Einstein Who theorized that an excited electron will spontaneously return to its ground state? Bohr The first ruby laser was created in _____ by ______. 1960, Ted Maiman _________ reported in 1965 that a ruby laser could vaporize enamel. Stern and Sognnaes First pulsed Nd:YAG laser released in ______ and cuts ______ tissue. 1990, soft tissue In _____ the first dental hard tissue was FDA cleared and is called _______. And the ______ laser a year later. 1997 Er: YAG laser Er, Cr: YSGG The word LASER is an acronym standing for _________. Light Amplification by Stimulated Emission of Radiation Laser parameters include what 3 things? 1)Duration of exposure 2)Fiber Diameter 3)Wavelength Lasers are: ______chromatic? _____directional? coherent or noncoherent? emitted from a stimulated ____________. monochromatic: made of a single wavelength (visible or infrared) unidirectional coherent (all peaks and valleys of each wave travel in unison) active medium What states can the active medium be in? solid, gas, semiconductor What type of active medium is used in Er: YAG? solid state using crystal matrix (erbium laced yttrium, aluminum and garnet) What type of gas is used when the active medium is sealed in an air tight chamber?