Andwhat's moreamazingisthatif a solitaryphotonpassesbyanexcitedatomthatcouldemitanotherphoton, there's a goodchanceitwillemitonebecausethetwophotonswantbetogether - evenbeforethesecondoneexists.
Soonceyouhaveallthesefriendlyphotonsbouncingaroundbetweenthemirrors, youcanjustopenup a littleholeattheendandletout a blindingstreamofcoherentlight - a laserbeam.
Toseelasersinaction, checkoutthissweetepisodeof "SmarterEveryDay" showing a laseryoucanstickyourhandinside!
Theyalsohave a bunchofothercoolsciencevideos.
Tomake a laser, allyouneedtodoisgive a bigcollectionofatomsenoughenergysothey'reexcitedandreadytoemitlight.
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