PURPOSE: An automation device of a passive mode-locking process of optical fiber femtosecond pulse lasers is provided to allow the mode lock of optical fiber femtosecond lasers for a short time by automating a manual mode locking process of a nonlinear polarization rotation manner.;CONSTITUTION: A resonator(100) has a ring cavity structure including a femtosecond laser source. An automatic polarization control unit(107) includes a wave plate and a polarizing plate. The automatic polarization control unit controls a rotation angle of the polarizing plate and the wave plate by receiving femtosecond lasers outputted from the resonator. The automatic polarization control unit controls polarized light for mode lock. A mode lock sensing unit(114) senses a signal for the mode lock by sensing a spectrum difference after or before the mode lock of the femtosecond lasers outputted from the resonator. A control unit(200) controls the automatic polarization control unit and the mode lock sensing unit with a program.;COPYRIGHT KIPO 2012
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