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WorksheetsSemiconductor laser
Total questions: 10
Worksheet time: 5mins
Example for direct band gap semiconductors are
GaAs
Ge
Si
AlSb
Direct band semiconductors are used to make
Diode
Transisters
LED, Laser diodes
Integrated circuits
Active medium in semiconductor laser is
CO2
P-N junction diode
Helium
Neon
Wavelength produced by smeiconductor laser is
5000 Angstrom
6000 Angstrom
8400 to 8600 Angstrom
None
The wavelength of the emitted radiations depends upon the -----------------------in GaAs
Refractive Index
Band gap, concentration of donor and acceptor atoms
Current
Resistance
To start the stimulated emissions in direct bandgap semiconductors is required
low current density
large divergence
coherence
Large current density
Which of the following has low threshold current density?
Homojunction laser
CO2 laser
Heterojunction laser
He-Ne laser
In GaAs semiconductor diode, the band gap of GaAs is 1.44eV. Calculate the wavelength.
8400 Angstroms
8000 Angstroms
8628 Angstroms
8200 Angstroms
--------- is an injection laser.
He-Ne laser
Semiconductor laser
Molecular gas laser
Solid state laser
Pumping technique employed in semiconductor laser is -----------
Direct conversion
Optical pumping
Electrical discharge method
Chemicla reaction
