| 摘要 |
PROBLEM TO BE SOLVED: To provide a semiconductor laser module that is capable of making a Fabry-Perot semiconductor laser module narrow in oscillation frequency band width and easily carrying out wavelength composition. SOLUTION: When an optical fiber 13 is provided on the resonant optical path of a semiconductor laser, a band-pass filter 4 that transmits light of specific wavelength and whose half band width is 1 to 5 nm is arranged in a laser module section 100, and a reflecting point 20 where light that is transmitted through the band-pass filter 4 is reflected is provided 50 cm or more apart from a semiconductor laser element 1 at the tip of the optical fiber 13.
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