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Q. |
QD lasers have a very low threshold current densities of range |
A. | 0.5 to 5 a cm-2 |
B. | 2 to 10 a cm-2 |
C. | 10 to 30 a cm-2 |
D. | 6 to 20 a cm-2 |
Answer» D. 6 to 20 a cm-2 |
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