Q.20 A laser device has a threshold current density of 865.65 A−cm−2 and threshold current of 529 mA. The current spared through an active region with a distance of 63μm. If the cavity width of the laser is 200.36μm, the cavity length of this laser is:(a)1020μm(b)970μm(c)740μm(d)305μm Q.20 A laser device has a threshold current density of 865.65 A.cm-² andthreshold current of 529 mA. The current spared through an active region witha distance of 63 µm. If the cavity width of the laser is 200.36 µm, the cavitylength of this laser is:(a) 1020 μm(b) 970 μm(d) 305 µm(c) 740 μm

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Q.20 A laser device has a threshold current density of 865.65 A−cm−2 and threshold current of 529 mA. The current spared through an active region with a distance of 63μm. If the cavity width of the laser is 200.36μm, the cavity length of this laser is: (a)1020μm (b)970μm (c)740μm (d)305μm