H - Electricity – 01 – S
Patent
H - Electricity
01
S
H01S 5/40 (2006.01) H01S 5/0683 (2006.01) H04B 10/04 (2006.01) H01S 3/25 (1990.01)
Patent
CA 2074412
An integrated semiconductor laser array apparatus which is simple in structure and yet capable of stabilizing the light output from each individual semiconductor laser element. The integrated semiconductor laser array apparatus includes a semiconductor laser array provided by integrating a plurality of semiconductor laser elements. The semiconductor laser array includes a master semiconductor laser element selected from the plurality of semiconductor laser elements and slave semiconductor laser elements constituted of the remaining semiconductor laser elements. A laser beam output from the master semiconductor laser element is sensed by a photodiode and thereby a photocurrent corresponding to the received light intensity is generated and the bias current for the master semiconductor laser element is controlled by a first bias current control circuit such that the generated photocurrent is kept constant. The bias current for each of the slave semiconductor laser elements is controlled by a second bias current control circuit depending on the output from the first bias current control circuit such that the ratio between the bias current for the master semiconductor laser element and the bias current for each of the plurality of slave semiconductor laser elements is kept constant.
Fujimoto Nobuhiro
Rokugawa Hiroyuki
Fetherstonhaugh & Co.
Fujitsu Limited
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