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A double heterostructure Fabry-Perot edge-emitting laser in the AlGaAs/GaAs system emits in the neighborhood of 900...

A double heterostructure Fabry-Perot edge-emitting laser in the AlGaAs/GaAs system emits in the neighborhood of 900 nm. The chip is 200 um long. What is the wavelength difference between two adjacent modes?

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