ALD LASER Test Questions With Correct
Answers
Who btheorized bthe bconcept bof bstimulated bemission? b- bcorrect banswers✔✔Einstein
Who btheorized bthat ban bexcited belectron bwill bspontaneously breturn bto bits bground
bstate? b- bcorrect banswers✔✔Bohr
The bfirst bruby blaser bwas bcreated bin b_____ bby b______. b- bcorrect banswers✔✔1960,
bTed bMaiman
_________ breported bin b1965 bthat ba bruby blaser bcould bvaporize benamel. b- bcorrect
banswers✔✔Stern band bSognnaes
First bpulsed bNd:YAG blaser breleased bin b______ band bcuts b______ btissue. b- bcorrect
banswers✔✔1990, bsoft btissue
In b_____ bthe bfirst bdental bhard btissue bwas bFDA bcleared band bis bcalled b_______.
bAnd bthe b______ blaser ba byear blater. b- bcorrect banswers✔✔1997
Er: bYAG blaser b
Er, bCr: bYSGG
The bword bLASER bis ban bacronym bstanding bfor b_________. b- bcorrect
banswers✔✔Light bAmplification bby bStimulated bEmission bof bRadiation
Laser bparameters binclude bwhat b3 bthings? b- bcorrect banswers✔✔1)Duration bof
bexposure
2)Fiber bDiameter
3)Wavelength
Lasers bare: b
______chromatic?
_____directional?
coherent bor bnoncoherent?
emitted bfrom ba bstimulated b____________. b- bcorrect banswers✔✔monochromatic:
bmade bof ba bsingle bwavelength b(visible bor binfrared)
unidirectional
coherent b(all bpeaks band bvalleys bof beach bwave btravel bin bunison) b
active bmedium
, What bstates bcan bthe bactive bmedium bbe bin? b- bcorrect banswers✔✔solid, bgas,
bsemiconductor
What btype bof bactive bmedium bis bused bin bEr: bYAG? b- bcorrect banswers✔✔solid
bstate busing bcrystal bmatrix b(erbium blaced byttrium, baluminum band bgarnet)
What btype bof bgas bis bused bwhen bthe bactive bmedium bis bsealed bin ban bair btight
bchamber? b- bcorrect banswers✔✔CO2
Diode blasers bhave bwhat btype bof bactive bmedium? b- bcorrect
banswers✔✔semiconductor
what bphotons bform bthe blaser? b- bcorrect banswers✔✔light bthat bleaks bfrom bthe
boutput bcoupler
Stimulated bemission: b- bcorrect banswers✔✔atoms bof bthe bactive bmedium bare
bstimulated bto ba bhigher benergy blevel--> breleased bas ba bphoton bas bthe batom
breturns bto ba bmore bstable blower benergy blevel.
Amplification b- bcorrect banswers✔✔Released bphotons bcan bgo bon bto bstimulate bmore
batoms bin bthe bcrystal, bthus bproducing bmore bphotons
Energy bdensity bdepends bon bwhat b3 bthings? b- bcorrect banswers✔✔energy,
bdivergence b(tendency bof ba blaser bbeam bto bspread boutward=laser bbeam bdiameter
bincreases), band bdistance
Energy bis bmeasured bin b______ b- bcorrect banswers✔✔Joules b(millijoules)
Power bis b______ band bis bmeasured bin b_______ b- bcorrect banswers✔✔rate bof bdoing
bwork, bor benergy bused bover ba bperiod bof btime band bis bmeasured bin bWatts b(J/sec)
Frequency bis bmeasured bin b_____. b- bcorrect banswers✔✔Hertz b( blaser bpulses/sec)
What bis bthe bmost bimportant bvariable bdictating bhow bthe blaser bbeam bwill binteract
bwith bthe btarget btissue? b- bcorrect banswers✔✔Peak bPower
Define bPeak bPower: b- bcorrect banswers✔✔power blevel bin beach bindividual blaser
bpulse, bhowever bit bis bnot bvisible bto bthe boperator
Describe bPeak bPower bin bthe b3 btypes:
1) bContinuous
2) bGated
3) bFree brunning bpulsed b- bcorrect banswers✔✔1) bthe bpeak bpower bequals bthe
baverage bpower bdisplayed
2) bAverage bpower bis bhalf bof bpeak bpower
Answers
Who btheorized bthe bconcept bof bstimulated bemission? b- bcorrect banswers✔✔Einstein
Who btheorized bthat ban bexcited belectron bwill bspontaneously breturn bto bits bground
bstate? b- bcorrect banswers✔✔Bohr
The bfirst bruby blaser bwas bcreated bin b_____ bby b______. b- bcorrect banswers✔✔1960,
bTed bMaiman
_________ breported bin b1965 bthat ba bruby blaser bcould bvaporize benamel. b- bcorrect
banswers✔✔Stern band bSognnaes
First bpulsed bNd:YAG blaser breleased bin b______ band bcuts b______ btissue. b- bcorrect
banswers✔✔1990, bsoft btissue
In b_____ bthe bfirst bdental bhard btissue bwas bFDA bcleared band bis bcalled b_______.
bAnd bthe b______ blaser ba byear blater. b- bcorrect banswers✔✔1997
Er: bYAG blaser b
Er, bCr: bYSGG
The bword bLASER bis ban bacronym bstanding bfor b_________. b- bcorrect
banswers✔✔Light bAmplification bby bStimulated bEmission bof bRadiation
Laser bparameters binclude bwhat b3 bthings? b- bcorrect banswers✔✔1)Duration bof
bexposure
2)Fiber bDiameter
3)Wavelength
Lasers bare: b
______chromatic?
_____directional?
coherent bor bnoncoherent?
emitted bfrom ba bstimulated b____________. b- bcorrect banswers✔✔monochromatic:
bmade bof ba bsingle bwavelength b(visible bor binfrared)
unidirectional
coherent b(all bpeaks band bvalleys bof beach bwave btravel bin bunison) b
active bmedium
, What bstates bcan bthe bactive bmedium bbe bin? b- bcorrect banswers✔✔solid, bgas,
bsemiconductor
What btype bof bactive bmedium bis bused bin bEr: bYAG? b- bcorrect banswers✔✔solid
bstate busing bcrystal bmatrix b(erbium blaced byttrium, baluminum band bgarnet)
What btype bof bgas bis bused bwhen bthe bactive bmedium bis bsealed bin ban bair btight
bchamber? b- bcorrect banswers✔✔CO2
Diode blasers bhave bwhat btype bof bactive bmedium? b- bcorrect
banswers✔✔semiconductor
what bphotons bform bthe blaser? b- bcorrect banswers✔✔light bthat bleaks bfrom bthe
boutput bcoupler
Stimulated bemission: b- bcorrect banswers✔✔atoms bof bthe bactive bmedium bare
bstimulated bto ba bhigher benergy blevel--> breleased bas ba bphoton bas bthe batom
breturns bto ba bmore bstable blower benergy blevel.
Amplification b- bcorrect banswers✔✔Released bphotons bcan bgo bon bto bstimulate bmore
batoms bin bthe bcrystal, bthus bproducing bmore bphotons
Energy bdensity bdepends bon bwhat b3 bthings? b- bcorrect banswers✔✔energy,
bdivergence b(tendency bof ba blaser bbeam bto bspread boutward=laser bbeam bdiameter
bincreases), band bdistance
Energy bis bmeasured bin b______ b- bcorrect banswers✔✔Joules b(millijoules)
Power bis b______ band bis bmeasured bin b_______ b- bcorrect banswers✔✔rate bof bdoing
bwork, bor benergy bused bover ba bperiod bof btime band bis bmeasured bin bWatts b(J/sec)
Frequency bis bmeasured bin b_____. b- bcorrect banswers✔✔Hertz b( blaser bpulses/sec)
What bis bthe bmost bimportant bvariable bdictating bhow bthe blaser bbeam bwill binteract
bwith bthe btarget btissue? b- bcorrect banswers✔✔Peak bPower
Define bPeak bPower: b- bcorrect banswers✔✔power blevel bin beach bindividual blaser
bpulse, bhowever bit bis bnot bvisible bto bthe boperator
Describe bPeak bPower bin bthe b3 btypes:
1) bContinuous
2) bGated
3) bFree brunning bpulsed b- bcorrect banswers✔✔1) bthe bpeak bpower bequals bthe
baverage bpower bdisplayed
2) bAverage bpower bis bhalf bof bpeak bpower
