Semiconductor laser
Quiz
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Physics
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University
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Medium
prakasam kavitha
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10 questions
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1.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
Example for direct band gap semiconductors are
GaAs
Ge
Si
AlSb
2.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
Direct band semiconductors are used to make
Diode
Transisters
LED, Laser diodes
Integrated circuits
3.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
Active medium in semiconductor laser is
CO2
P-N junction diode
Helium
Neon
4.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
Wavelength produced by smeiconductor laser is
5000 Angstrom
6000 Angstrom
8400 to 8600 Angstrom
None
5.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
The wavelength of the emitted radiations depends upon the -----------------------in GaAs
Refractive Index
Band gap, concentration of donor and acceptor atoms
Current
Resistance
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
To start the stimulated emissions in direct bandgap semiconductors is required
low current density
large divergence
coherence
Large current density
7.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
Which of the following has low threshold current density?
Homojunction laser
CO2 laser
Heterojunction laser
He-Ne laser
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