[13a-N404-1~7] CS.4 3.6 超高速・高強度レーザー、3.7 レーザープロセシング、4.3 Lasers and laser materials processingのコードシェアセッション

▲ [13a-N404-2] 750-MHz repetition rate phase-linked Yb-fiber lasers for dual-comb spectroscopy

〇(P)Haochen Tian¹、Akifumi Asahara¹、Kaoru Minoshima¹ (1.The Univ. of Electro-Communications)

キーワード：Optical frequency combs, Dual comb spectroscopy, Phase locking

In this work, we demonstrate a dual-comb laser system based on two high repetition rate 750-MHz Yb fiber mode-locked lasers. Two combs are both phase-linked to RF references with at least 10^-11 stability. The repetition rate difference between two lasers is around 4 MHz. By combining the outputs of two combs, dual-comb interferogram was observed. In the talk, we will also present phase locking the CW laser to one of comb lines of Comb 1 in order to further reduce the relative phase noise between the two combs. Then we aim to reduce the relative stability of the two combs to < 10^-15 level, corresponding to < 10 Hz relative linewidth. In this way, our dual-comb system could be exploited in high-speed dual-comb spectroscopy, benefiting from the relative low noise, large comb mode spacing and repetition rate difference.