| 摘要 |
PURPOSE:To easily generate a high repetition short optical pulse in which a chirping is cancelled by pulse-compressing by using variation in a refractive index generated in a saturated range of a semiconductor laser amplifier. CONSTITUTION:A high frequency signal output from an oscillator land a DC current are combined by a bias tee 2, a semiconductor laser 3 is excited to gain-switch the laser 3, an optical pulse having a red shift chirping is generated, and guided to a single-mode optical fiber 7 through lenses 4, 5 and an isolator 6. The pulse of the chirping is cancelled at the chirping by the dispersion of the fiber 7, and pulse-compressed. This is introduced to a semiconductor laser amplifier 8, and the pulse of a blue shift chirping is emitted from the amplifier 8 by variation in carrier density generated in its saturated range. This pulse is guided to a single-mode optical fiber 9 of an abnormal dispersion to cancel the chirping and to further pulse-compress it. |
