A multimode GaAs laser diode is emitting at a wavelength of approximately 0.9 μm. At that wavelength the index of refraction of GaAs is 3.6 and the dispersion is 0.5 μm−1. The laser cavity length of...

A multimode GaAs laser diode is emitting at a wavelength of approximately

0.9 μm. At that wavelength the index of refraction of GaAs is 3.6 and the

dispersion is 0.5 μm−1. The laser cavity length of 300 μm. Calculated the

mode spacing (in wavelength) at approximately 0.9 μm.