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.

Buried hetero-junction (BH) device is a type of _____________ laser wh

1.	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» E.