講演情報
[11a-C213-5]Rate- and delay-variable 532-nm picosecond light source with LD seed and PPLN
〇(D)Tofan Pan1, Masataka Kobayashi1, Yihan Qi1, Cong Wang1, Fuyi Cao1, Shaoqiang Chen1,2, Lung-Han Peng3,4, Takashi Ito5, Hidefumi Akiyama1,5 (1.ISSP, Univ. of Tokyo, 2.Dept. of Elec. Eng., East China Normal Univ., 3.GIPO, NTU, 4.Dept. of EE, NTU, 5.LDseed Co., Ltd.)
キーワード：
LD、YDFA、PPLN
This study investigates a 532-nm picosecond green-light source based on an electrically triggered DFB laser diode seed, two-stage ytterbium-doped fiber amplifier (YDFA), and single-pass PPLN second-harmonic generation (SHG). We are developing such systems using not only commercial but also home-made LDs and PPLN/PPLT. Here, we study the repetition-rate dependence of a 532-nm picosecond source over a repetition-rate range of 0.2–100 MHz.The seed average power increased almost linearly with repetition rate, indicating nearly constant seed pulse energy. After amplification, the fundamental power delivered to the PPLN increased from approximately 9 mW at 0.2 MHz to 177 mW at 100 MHz, while the Yb ASE pedestal was suppressed at higher repetition rates. The green output power reached a maximum of 29.8 mW near 20 MHz, whereas the SHG conversion efficiency peaked at 31.8% near 5 MHz, and the second-harmonic single-pulse energy reached 5.9 nJ near 0.5 MHz.