TDLAS based laser expiration analyzer and system

The invention provides a TDLAS based laser expiration analyzer and system. The laser expiration analyzer comprises a tunable semiconductor laser device, a gas absorption container, a laser receiving unit and a processing control unit, wherein the gas absorption container is provided with a gas inlet and a gas outlet; laser sent out by the tunable semiconductor laser device passes through the gas absorption container and is received by the laser receiving unit connected with the processing control unit; the laser receiving unit is used for converting received light signals into electric signals, and transmitting the electric signals to the processing control unit; the processing control unit analyses the gas concentration according to the received electric signals. The TDLAS based laser expiration analyzer and system have the beneficial effects that the detection accuracy is high, the speed is high, the portability is good, the size is small, and the TDLAS based laser expiration analyzer and system can be charged, can be carried to anywhere for detection, can be used for knowing about situations by being connected with a cell phone via software, and can be used for storing historical data.