| 摘要 |
A semiconductor laser device, with a semiconductor laser element operable to oscillate and output a laser beam, is provided with a heat generation unit operable to generate heat so as to regulate the temperature of the semiconductor laser element, a laser beam splitting unit operable to split a laser beam, oscillated and output from the semiconductor laser element, into first and second beams each forming an optical path different from each other, and a heat generation control unit operable to control the amount of heat generated by the heat generation unit so as to maintain constant a fringe spacing between interference fringes with a plurality of fringes obtained as a result of the interference between the first and second beams.
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