Semiconductor laser

Semiconductor laser

University

10 Qs

quiz-placeholder

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Semiconductor laser

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Assessment

Quiz

Physics

University

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prakasam kavitha

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10 questions

Show all answers

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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