[11a-E219-1~5] 4.3 Laser sources and Laser applications

10:30 〜 10:45奨励賞エントリー英語発表

[11a-E219-3] Thermally Controlled All-PM Sagnac Filter for Wavelength-Tunable Mode-Locked Fiber Lasers

〇Yanhua Sha^1,2, Maolin Dai³, Yuanjun Zhu^1,2, Yifan Ma^1,3, Shinji Yamashita^1,3, Sze Yun Set^1,2 (1.UTokyo RCAST, 2.UTokyo AIS, 3.UTokyo EEIS)

キーワード：

Mode-locked fiber laser、Sagnac filter、Wavelength tuning

We demonstrate a thermally controlled all-polarization-maintaining (all-PM) Sagnac filter and its application in a wavelength-tunable mode-locked erbium-doped fiber laser. The filter is formed by cross-splicing the output ports of a 3-dB coupler to create a PM-fiber loop with an 18-cm length imbalance. Thermal tuning enables a continuous shift of the transmission peak over a wavelength range exceeding 30 nm. Incorporated into an all-PM mode-locked fiber laser, the filter provides continuous wavelength tuning from 1543 nm to 1574 nm with a tuning efficiency of −0.83 nm/°C. In addition, dual-wavelength mode-locked operation is demonstrated. The proposed approach offers a simple, robust, and low-loss solution for wavelength-tunable ultrafast fiber lasers.