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WorksheetsTYPES AND APPLICATIONS OF LASER
Total questions: 10
Worksheet time: 6mins
What is the process responsible for producing photons in diode laser?
Fermi level shift
Majority carrier injection
Carrier freeze out
Electron-hole recombination
What are three types of Laser?
gas,solid,diode
diode,inverted,pointer
gas,metal vapor,rock
pointer,diode,CD
Example of solid state laser is
He-Ne laser
co2 laser
Nd:YAG Laser
Dye laser
Example for direct band gap semiconductors are
GaAs
Ge
Si
AlSb
Wavelength produced by semiconductor laser is
5000 Angstrom
6000 Angstrom
8400 to 8600 Angstrom
None
How can lasers remove tattoos from skin?
by burning away skin cells containing tattoo ink
by chemically changing tattoo ink so that it is invisible
by breaking down the molecules that make up the ink
laser tattoo removal is currently impossible
Life time of metastable state is
10-8 s
10-10 s
10-3 s
10-9 s
Which type of laser is best suited for use in CD/DVD players?
gas laser
laser diode
solid-state laser
excimer laser
What is the purpose of a laser in a laser printer?
to burn an image onto paper
to electrically charge the paper so that it will attract toner particles
to transmit the image to be printed from the computer to the printer
to determine how much ink is left in the printer
