| 摘要 |
PURPOSE:To allow light having two kinds of wavelength to be selectively emitted for preventing destruction due to a backward electromotive force, by a method wherein diode lasers are connected in parallel so as to be opposite in polarity to each other, and the direction of the driving current is changed over. CONSTITUTION:A first diode laser D1 and a second diode laser D2 having an oscillation wavelength different from that of the first diode laser D1 are connected in parallel so as to be opposite in polarity to each other to constitute a parallel diode structure. A laser-driving power source that can be changed over to positive and negative is connected across the parallel diode structure. By changing over the polarity of the power source, the first and second diode lasers D1, D2 are made to selectively emit light having wavelengths different from each other. |
