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1. |
An uncoated FPA has peak gain wavelength 1.8μm, mode spacing of 0.8nm, and long active region of 300 v. Determine RI of active medium. |
A. | 4.25×106 |
B. | 3.75×107 |
C. | 3.95×107 |
D. | 4.25×109 |
Answer» C. 3.95×107 | |