In the early 1980s, literature on the measurement of gas concentrations based on laser diode absorption spectroscopy (TDLAS) has emerged. Because TDLAS technology has significant technical advantages over traditional spectral detection technology, it has been rapidly promoted. After 2000, China's enterprises and institutions have carried out research on diode laser spectroscopy of a variety of inorganic asymmetric gas molecules. In recent years, domestic research units have achieved initial results in mine operations, coal-to-gas monitoring, natural gas, and oil and gas monitoring through technical cooperation and transfer. The main component of TDLAS technology is infrared laser light source. We have developed 1.6-2.0μm band light source, developed large strain quantum well DFB laser and DBR laser, the threshold current is less than 20 mA, the side mode suppression ratio is more than 40dB, and the fiber output power. More than 8 mW, achieving practical results. The narrow-linewidth distributed feedback laser is prepared in small batches, and the related projects of the 863 project "Key Technology of Gas Detection System Based on Quantum Well Laser" are completed. Relevant results are applied in coal mine gas, oil and gas, automobile exhaust gas, medical exhaled gas detection and other industries. Provide technical support for many domestic gas sensing companies. The related results were awarded the second prize of the invention of the Chinese Institute of Electronics, "Key Technology Research of Gas Detection System Based on Quantum Well Laser".
Research on quantum well laser for gas sensing