What is the process called when a photon released from an excited atom stimulates another similarly excited atom to release an identical photon?
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23%
Spontaneous emission
5%
Reflection
6%
Absorption
66%
Stimulated emission
What happens to the emitted photons during stimulated emission?
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16%
They are absorbed by the atom
5%
They disappear
79%
They promote the release of additional identical photons
What is the result of stimulated emissions when a large number of atoms are excited?
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8%
Increased heat
14%
Reduced light intensity
2%
Decreased energy
77%
Light amplification
Repeating the process Spontaneous emission causes the occurrence of
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32%
Light amplification
7%
Decreased energy
13%
The atom stops moving
48%
Stimulated emission
What is the wavelength of the radiation emitted by a Helium neon laser?
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3%
904 nm
88%
632.8 nm
6%
800 nm
3%
1064 nm
What type of radiation does a Helium neon laser emit?
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18%
Infrared radiation
9%
Blue visible radiation
73%
Red visible radiation
What is the depth of penetration for a Helium neon laser before it loses 37% of its intensity?
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76%
0.5 - 1 mm
15%
2 - 3 mm
3%
3 - 4 cm
6%
1 - 2 cm
What is the wavelength of the radiation emitted by a Semiconductor diode laser (Ga-As)?
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82%
904 nm
6%
1099 nm
4%
632.8 nm
7%
800 nm
What type of radiation does a Ga-As laser emit?
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13%
Red visible radiation
7%
Blue visible radiation
4%
Ultraviolet radiation
75%
Infrared radiation
What is the depth of penetration for a Ga-As laser before it loses 37% of its intensity?
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11%
Less than 0.5 mm
15%
1 - 2 cm
74%
Greater than 2 mm
Which laser type is used to achieve deeper tissue penetration?
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1%
Both have the same penetration depth
20%
Helium neon laser
78%
Semiconductor diode laser (Ga-As)
What is the role of the lasing medium in a laser unit?
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24%
To reflect the laser light
59%
To generate the laser light
16%
To absorb the laser light
1%
To cool the laser unit
What type of lasing medium can be used to generate laser light?
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0%
Solid
5%
semiconductor
8%
gas
86%
All of above
Which of the following is NOT a component of a laser unit mentioned in the image?
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6%
Energy source
4%
Lasing medium
10%
Resonating cavity
80%
Cooling system
What is the significance of using a mirrored chamber in the resonating cavity?
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13%
To increase the temperature of the laser unit
87%
To facilitate the amplification of the laser light
0%
To decrease the intensity of the laser light
Which component of the laser unit directly influences the wavelength of the emitted laser light?
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7%
Cooling system
17%
Energy source
49%
Lasing medium
27%
Resonating cavity
Resonating cavity in laser contain to two fully reflective mirrors.
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29%
True
71%
False
❤1
Resonating cavity in laser contain to fully reflective mirror and partial mirror.
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88%
True
12%
False
Which class of laser use in physiotherapy?
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9%
Class 1
14%
Class 2
72%
Class 3
5%
Class 4