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A GaAs injection laser has a threshold current density of 2.5*103Acm?2and length and width of the cavity is 240?mand 110?m respectively. Find the threshold current for the device.


A) 663 ma
B) 660 ma
C) 664 ma
D) 712 ma

Correct Answer

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The Nd: YAG laser is costlier than earth-doped glass fiber laser. State whether the following statement is true or false

Correct Answer

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_________________ is used when the optical emission results from the application of electric field.


A) radiation
B) efficiency
C) electro-luminescence
D) magnetron oscillator

Correct Answer

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In the given equation, what does p stands for?


A) permittivity
B) probability
C) holes
D) crystal momentum

Correct Answer

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