[14p-P6-1~14] 3.5 Laser system and materials

[14p-P6-2] Amplitude of Pump-to-Signal Modulation in a Tm-doped Fiber for Active Mode-locking

〇Yu Wang¹, Sze Set¹, Shinji Yamashita¹ (1.The Univ. Tokyo)

Keywords:mode-locking, fiber laser

Recently, we proposed and demonstrated a mode-locked Tm-doped fiber (TDF) laser using a technique termed “active mode-locking via pump modulation” (AMPM).The cavity gain is modulated via pump modulation, of which the modulation frequency is matched with the free spectral range of the cavity. In order to take pump modulation into account, the rate equations should be solved with the population-inversion density is modulated with sinusoidal pump power so that the lifetime of upper state can be included. Here, we investigate a pump-to-signal modulation transfer function in a TDF numerically and experimentally for understanding the mechanism of the AMPM method.