| 摘要 |
PROBLEM TO BE SOLVED: To increase relaxation vibration frequency, increase responsivity and improve RIN characteristic, by decreasing free-carrier absorption loss, in a clad layer adjacent to a core for reducing the threshold current. SOLUTION: In the laser element, both or one of clad layers is arranged to have a double-layer structure for restraining the impurity concentration, of one of the clad layers adjacent to a core, to a low level.
|
