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.

Question

Quizplus · Accepted Answer

The threshold current (I_th) can be calculated using the formula I_th = J_th * A, where J_th is the threshold current density and A is the cross-sectional area of the cavity. Given J_th = 2.5 * 10^3 A/cm^2 (or 2.5 * 10^7 A/m^2 to convert cm^2 to m^2), length = 240 μm (or 240 * 10^-6 m), and width = 110 μm (or 110 * 10^-6 m), the area A = length * width = (240 * 10^-6 m) * (110 * 10^-6 m) = 26.4 * 10^-12 m^2. Therefore, I_th = 2.5 * 10^7 A/m^2 * 26.4 * 10^-12 m^2 = 660 * 10^-3 A = 660 mA.

A GaAs Injection Laser Has a Threshold Current Density of 2.5*103Acm?2and

A GaAs Injection Laser Has a Threshold Current Density of 2.5*103Acm^?2and