Laser is an acronym for: correct answers Light
Amplification
Stimulated (by the)
Emission (of)
Radiation
The process of stimulated emission is the basis for correct answers laser physics
1960's Ted Maiman __________ correct answers constructed the first optical laser with a ruby crystal
...
Laser Biophysics || with Error-free Solutions.
Laser is an acronym for: correct answers Light
Amplification
Stimulated (by the)
Emission (of)
Radiation
The process of stimulated emission is the basis for correct answers laser physics
1960's Ted Maiman __________ correct answers constructed the first optical laser with a ruby
crystal
Leon Goldman brought laser technology to __________ correct answers medicine in 1961
The __________________________ was described in 1983. correct answers Theory of Selective
Photothermolysis
Atoms consist of negatively charged electrons that revolve around a positively charged nucleus
in specific orbits or shells. Each orbit corresponds to given amount of energy. Electrons orbit
energy to ____________. correct answers move to a higher energy orbit & emit energy to return
to as lower energy orbit.
Atoms are most stable hen their electrons are located at their lowest energy orbit called a
____________ correct answers ground state
An atom with an electron located anywhere but its lowest orbit is said to be ___________ and
has more than its minimum amount of energy. correct answers excited state
An atom is normally in its ground state (most stable), and it can be raised to one of its excited
states by either __________ or ____________. correct answers thermal excitation; stimulated
absorption
Example of thermal excitation: correct answers heating gas
Ice - water- steam
As gas heats, atoms move back and forth colliding. As they collide more violently, sufficient
energy becomes available (energy equal to the difference between an excited state and ground
state). An electron absorbs this energy and moves up to a higher energy orbit. Electrons can
continue to absorb energy until they reach their highest orbit. correct answers Thermal Excitation
Stimulated Absorption correct answers Laser
A photon (light) having energy to the difference between an excited state and ground state, is
absorbed by an atom's electron allowing the electron to move to a specific higher energy orbit.
correct answers Stimulated Absorption
,The _________ of photons from excited atoms of different _______ (colors). correct answers
random emission
wavelengths
(Rainbow or flashlight)
Photons are emitted _______ of each other creating ________ light. correct answers independent
incoherent (white)
(Orchestra)
Atoms are elevated to various excited states by __________ and emit photons _________ with
spontaneous emission. correct answers thermal excitation; randomly
The light produced comes from many ___________ creating a continuous spectrum of colors or
white light. correct answers wavelengths
An excited atom can be brought down to its ground state by ___________ it with a photon
having the same ___________ as the photon to be emitted. correct answers
stimulating;frequency
In contrast to Spontaneous Emission, Stimulated Emission is organized and of the same
_______- correct answers wavelength
A photon released from an excited atom triggers a second atom, having the same frequency, to
de-excite by ___________ a photon. correct answers emitting
The 2 identical photons travel off in the same direction forming a single _________________
wave. correct answers electromagnetic
Stimulated emission creates a ________ form of light (light that is __________ in a phase),
moving in the __________ direction. correct answers coherent; locked; same
A true laser beam is an example of light created by the ____________ ____________ of
__________. correct answers Stimulated;Emission; Radiation
Lasers require an active medium to produce light; this medium can be a: correct answers Liquid
Electronic
Gas (Co2 Laser)
Solid (Ruby; Nd:Yag 1064)
Radiation
Frequently, lasers are named after their ______. correct answers medium
Mediums create their own unique wavelengths or colors. The laser medium is located inside an
oscillator or laser amplifier.
Liquid correct answers Sye (rhodamine and fluorescein)
Electronic correct answers Semiconductors - Diode (an electronic device that conducts current in
one direction)
810 - Laser Hair Removal
Atoms within the medium are excited by a: correct answers Flash of light
Electricity or another
Laser
Once there are enough atoms within the medium that have reached an _________ state and have
their upper levels filled, a _________ ________ is said to have occurred. correct answers
excited; population inversion
Without a population inversion, the chance of stimulated emission is slim. Identical photons
begin to multiply or amplify a they reflect back and forth between two __________. correct
answers mirrors
Mirrors are located at either end of the lasing device, one mirror is ___________ to allow light to
escape. correct answers semi-transparent
The process of stimulated emission produces numerous _________ photons between the mirrors.
correct answers identical
The mirrors provide _________ to the light and allow light to ______ as it travels back and forth
between them. correct answers direction; amplify
Since the photons are identical, one pure wavelength of light will be produced which is
__________ (a pure color) correct answers monochromatic
Light escapes out of the sei-transparent mirror creating a ______ beam of light (locked in a
phase). correct answers coherent
A True Laser Beam is: correct answers Coherent (locked in a phase)
Collimated (stays together in a tight beam - will not diverge or converge on itself)
Monochromatic (a pure color)
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