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

A GaAs injection laser has a threshold current density of 2.5*103Acm-2 and length and width of the cavity is 240μm and 110μm respectively. Find the threshold current for the device. Correct Answer 660 mA

The threshold current is denoted by Ith. It is given by- Ith = Jth * area of the optical cavity Where Jth = threshold current density Area of the cavity = length and width.

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