Asynchronous mid-infrared broadband optical parametric oscillator for dual-comb spectroscopyZhaowei Zhang, Chenglin Gu, Jinghua Sun, Chingyue Wang, Tom Gardiner and Derryck T. ReidEPJ Web of Conferences, 41 (2013) 10008DOI: https://doi.org/10.1051/epjconf/20134110008