LASERS CERTIFICATION EXAM `& VERIFIED ANSWERS | LATEST UPDATE | RATED 100%

Theorized the concept of stimulated emission ANSWER: Einstein Theorized that an excited electron will spontaneously return to its ground state ANSWER: Bohr First ruby laser was created in _____ by ______. ANSWER: 1960, Ted Maiman _________ reported in 1965 that a ruby laser could vaporize enamel. ANSWER: Stern and Sognnaes First pulsed Nd:YAG laser released in ______ and cuts ______ tissue. ANSWER: 1990, soft tissue In _____ the first dental hard tissue was FDA cleared and is called _______. And the ______ laser a year later. ANSWER: 1997 Er: YAG laser Er, Cr: YSGG The word LASER is an acronym standing for _________. ANSWER: Light Amplification by Stimulated Emission of Radiation Laser parameters include what 3 things? ANSWER: 1)Duration of exposure 2)Fiber Diameter 3)Wavelength Lasers are: ______chromatic? _____directional? coherent or noncoherent? emitted from a stimulated ____________. ANSWER: 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? ANSWER: solid, gas, semiconductor What type of active medium is used in Er: YAG? ANSWER: 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? ANSWER: CO2 Diode lasers have what type of active medium? ANSWER: semiconductor what photons form the laser? ANSWER: light that leaks from the output coupler Stimulated emission: ANSWER: atoms of the active medium are stimulated to a higher energy level--> released as a photon as the atom returns to a more stable lower energy level. Amplification ANSWER: Released photons can go on to stimulate more atoms in the crystal, thus producing more photon