| 摘要 |
PROBLEM TO BE SOLVED: To obtain an inexpensive semiconductor laser module with thermion cooling element, in which variation in the output from an optical fiber can be reduced by about 50%. SOLUTION: A lens 4 integrated with an optical isolator 3 is inserted into a holder 9 secured, by Ag brazing, to the wall of a package 8 having a flange 7 being fixed to an external heat dissipation fin on the bottom plate and secured in place by means of solder while being sealed hermetically. On the inside of a package 8, a heat sink 10 formed of a copper tungsten alloy and having a size of 5.5×6.5×6.5 mm is secured, by Ag brazing, to the inner wall face 11 and the bottom face 12 on the side opposite to the holder 9.
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