Room-temperature continuous-wave interband cascade laser emitting at 3.45 μm<xref rid="cpb_27_12_124207fn1" ref-type="fn">*</xref><fn id="cpb_27_12_124207fn1"><label>*</label><p>Project supported by the Major Program of the National Natural Science Foundation of China (Grant No. 61790580), the National Natural Science Foundation of China (Grant No. 61435012), and the National Basic Research Program of China (Grant No. 2014CB643903).</p></fn>

Room-temperature continuous-wave interband cascade laser emitting at 3.45 μm**

Project supported by the Major Program of the National Natural Science Foundation of China (Grant No. 61790580), the National Natural Science Foundation of China (Grant No. 61435012), and the National Basic Research Program of China (Grant No. 2014CB643903).

Zhang Yi^{1, 2, 3}, Shao Fu-Hui^{1, 2, 3}, Yang Cheng-Ao^{1, 2, 3}, Xie Sheng-Wen^{1, 2, 3}, Huang Shu-Shan^{1, 2, 3}, Yuan Ye^{1, 2, 3}, Shang Jin-Ming^{1, 2, 3}, Zhang Yu^{1, 2, 3, †}, Xu Ying-Qiang^{1, 2, 3}, Ni Hai-Qiao^{1, 2, 3}, Niu Zhi-Chuan^{1, 2, 3, ‡}

(color online) The band structure of the cascade region of ICL.