Q.

The                              system is best developed and is used for fabricating both lasers and LEDs for the shorter wavelength region.

A. inp
B. gasb
C. gaas/gasb
D. gaas/alga as dh
Answer» D. gaas/alga as dh
Explanation: for dh device fabrication, materials such as gaas, alga as are used. the band-gap in this material may be tailored to span the entire wavelength band by changing the alga composition. thus, gaas/ alga as dh system is used for fabrication of lasers and leds for shorter wavelength region (0.8μm-0.9μm).
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