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    • 10. 发明公开
    • External-cavity tunable wavelength light source using semiconductor laser having phase adjustment area
    • 使用半导体激光器区域用于调整相位的外部谐振器的波长可调光源
    • EP0687045A3
    • 1996-03-20
    • EP95108652.9
    • 1995-06-06
    • ANRITSU CORPORATION
    • Ohtateme, HiroakiEndoh, HiroakiGoto, HiroshiIkeuchi, KoAsai, Akihiko
    • H01S3/085H01S3/103
    • H01S5/141H01S5/06255
    • In an external-cavity tunable wavelength light source using a semiconductor laser (LD), an oscillation wavelength is tuned by simultaneously changing a current to be injected to the phase adjustment area of the LD and the rotation angle of a diffraction grating while holding the same external cavity longitudinal mode. A light beam emitted from the AR-coated end face of the LD (6) having the phase adjustment area (6b) is collimated by a lens (2) and incident on the diffraction grating (3). Only a light component having a specific wavelength selected upon spectral dispersion is reflected by the diffraction grating (3) and returns to the LD (6). With this operation, an external cavity (effective cavity length K) is formed between the LD (6) and the diffraction grating (3), thereby performing laser oscillation at a wavelength determined by an external cavity longitudinal mode and the cavity loss of the diffraction grating (3). The effective cavity length K can be changed in accordance with the current to be injected to the phase adjustment area (6b). A current injection unit (7) injects the current to the phase adjustment area. An oscillation wavelength control unit (8) controls the injection current output from the current injection unit (7) and the rotation angle of the diffraction grating (3).
    • 在使用半导体激光器(LD),以振荡波长外谐振腔的可调谐波长光源是通过同时改变电流被注入到LD的相位调整区域和衍射的同时保持相同的光栅的旋转角度调谐 外腔纵模。 的光束从LD的AR涂覆的端面发射(6)具有相位调整区域(6b)的被透镜(2)和准直入射到衍射光栅(3)。 只有具有在光谱色散选择的特定波长的光分量被衍射光栅(3),并返回到LD(6)反射。 与此手术,外腔(有效腔长度k)是LD(6)和所述衍射光栅(3),从而执行激光振荡在由外腔纵模开采确定性的波长和衍射的腔损耗之间形成 光栅(3)。 有效腔长度K可以在雅舞的电流来改变要被注入到相位调整区域(6b)中。 电流注入单元(7)注入电流到相位调整区域。 的振荡波长控制单元(8)控制从电流注入单元(7)输出的电流注入和光栅衍射的旋转角(3)。