[Solved] Buried hetero-junction (BH) device is a type of _____________ laser where the active volume is buried in a material of wider band-gap and lower refractive index.

Q.	Buried hetero-junction (BH) device is a type of _____________ laser where the active volume is buried in a material of wider band-gap and lower refractive index.
A.	gas lasers.
B.	gain guided lasers.
C.	weak index guiding lasers.
D.	strong index guiding lasers.
Answer» D. strong index guiding lasers.

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