| 摘要 |
PURPOSE:To obtain a stable oscillation output with low noise without affecting the influence of the displacement of a semiconductor laser by controlling the oscillation wavelength of the laser and simultaneously the oscillation wavelength width. CONSTITUTION:The first diffraction lattice dispersion optical system is comosed of a plane diffraction lattice 1 and collimator lenses 2, 3, and a reflecting surface 4 having slits 30 of ultrafine width is arranged on focusing surfaces u, v at the position of primary diffraction light. The second diffraction lattice dispersion optical system is also composed of a plane diffraction lattice 5, collimator lenses 6, 7, and a condensing lens 9. the reflecting surface 8 is placed at the position of zero diffraction light of the reflected light, and the lens 9 is disposed in the direction of the primary diffraction light. The first and second systems are disposed so that other focal surfaces are nearly contacted with each other, and semiconductor lasers 11-13 are aligned and mounted on the x-y surface. With this constructed structure, the controls of the oscillation wavelength and the oscillation oavelength width are simultaneously performed, thereby obtaining a semiconductor laser adapted for wavelength multiplex light communication. |
