Methane(CH_4)is one of the most important gases to be monitored in many fields such as atmospheric environment monitoring,industrial process control and coal mine production safety.Developing CH_4 sensor has a wide application value.Based on the fundamental frequency absorption band of CH_4 molecule near 3.31μm and its absorption line at 3038.5 cm~(-1) as the target line,a CH_4 sensor based on the mid-infrared room-temperature,continuous and single-mode interband cascaded laser(ICL)is developed.The sensor u...