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3. Consider that the gain width of a GaAs laser diode (LD) is similar to the...

3. Consider that the gain width of a GaAs laser diode (LD) is similar to the spectral
width of GaAs LED at room temperature. (a) How many modes are there for LD,
which is 100 microns long at room temperature? (Use values for GaAs as you
see fit). (b) How many modes will lase just above current threshold?

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